libdb/test/csharp/DatabaseEnvironmentTest.cs

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 2009, 2011 Oracle and/or its affiliates.  All rights reserved.
 *
 */
using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Text;
using System.Threading;
using System.Xml;
using NUnit.Framework;
using BerkeleyDB;

namespace CsharpAPITest
{
	[TestFixture]
	public class DatabaseEnvironmentTest : CSharpTestFixture
	{

		private DatabaseEnvironment testBeginTransactionEnv;
		private BTreeDatabase testBeginTransactionDB;

		private DatabaseEnvironment testCheckpointEnv;
		private BTreeDatabase testCheckpointDB;

		private DatabaseEnvironment testDetectDeadlocksEnv;
		private BTreeDatabase testDetectDeadlocksDB;

		private DatabaseEnvironment testFailCheckEnv;

		private EventWaitHandle signal;

		[TestFixtureSetUp]
		public void SetUp()
		{
			testFixtureName = "DatabaseEnvironmentTest";
			base.SetUpTestfixture();
		}

		[Test]
		public void TestArchivableDatabaseFiles()
		{
			testName = "TestArchivableDatabaseFiles";
			SetUpTest(true);
			string dbFileName1 = testName + "1.db";
			string dbFileName2 = testName + "2.db";

			// Open an environment.
			DatabaseEnvironmentConfig envConfig =
			    new DatabaseEnvironmentConfig();
			envConfig.AutoCommit = true;
			envConfig.Create = true;
			envConfig.UseMPool = true;
			envConfig.UseLogging = true;
			envConfig.UseTxns = true;
			DatabaseEnvironment env = DatabaseEnvironment.Open(
			    testHome, envConfig);

			// Open two databases.
			BTreeDatabaseConfig dbConfig =
			    new BTreeDatabaseConfig();
			dbConfig.Creation = CreatePolicy.IF_NEEDED;
			dbConfig.Env = env;
			BTreeDatabase db1 = BTreeDatabase.Open(dbFileName1, dbConfig);
			db1.Close();
			BTreeDatabase db2 = BTreeDatabase.Open(dbFileName2, dbConfig);
			db2.Close();

			/*
			 * Get all database files name in the environment.
			 * Two database file name should be returned and
			 * the same as the ones when opening the databases.
			 */
			List<string> dbFiles = env.ArchivableDatabaseFiles(false);
			Assert.AreEqual(2, dbFiles.Count);
			Assert.IsTrue(dbFiles.Contains(dbFileName1));
			Assert.IsTrue(dbFiles.Contains(dbFileName2));

			/*
			 * Get all database file's abosolute path in the
			 * environment. Confirm those files exist.
			 */
			List<string> dbFilesPath = env.ArchivableDatabaseFiles(true);
			Assert.IsTrue(File.Exists(dbFilesPath[0]));
			Assert.IsTrue(File.Exists(dbFilesPath[1]));

			env.Close();
		}

		[Test]
		public void TestArchivableLogFiles()
		{
			testName = "TestArchivableLogFiles";
			SetUpTest(true);
			string dbFileName = testName + ".db";

			// Open an environment.
			DatabaseEnvironmentConfig envConfig =
			    new DatabaseEnvironmentConfig();
			envConfig.AutoCommit = true;
			envConfig.Create = true;
			envConfig.UseMPool = true;
			envConfig.UseLogging = true;
			envConfig.UseTxns = true;
			DatabaseEnvironment env = DatabaseEnvironment.Open(
			    testHome, envConfig);

			// Open a databases.
			BTreeDatabaseConfig dbConfig =
			    new BTreeDatabaseConfig();
			dbConfig.Creation = CreatePolicy.IF_NEEDED;
			dbConfig.Env = env;
			BTreeDatabase db = BTreeDatabase.Open(
			    dbFileName, dbConfig);

			/*
			 * Put 1000 records into the database to generate
			 * more than one log files.
			 */
			byte[] byteArr = new byte[1024];
			for (int i = 0; i < 1000; i++)
				db.Put(new DatabaseEntry(
				    BitConverter.GetBytes(i)),
				    new DatabaseEntry(byteArr));

			db.Close();

			List<string> logFiles = env.ArchivableLogFiles(false);

			List<string> logFilesPath =
			    env.ArchivableLogFiles(true);
			for (int i = 0; i < logFilesPath.Count; i++)
				Assert.IsTrue(File.Exists(logFilesPath[i]));

			env.Close();
		}

		[Test]
		public void TestBeginCDSGroup()
		{
			testName = "TestBeginCDSGroup";
			SetUpTest(true);

			DatabaseEnvironmentConfig cfg =
			    new DatabaseEnvironmentConfig();
			cfg.Create = true;
			cfg.UseCDB = true;
			cfg.UseMPool = true;
			DatabaseEnvironment env = DatabaseEnvironment.Open(testHome, cfg);
			Transaction txn = env.BeginCDSGroup();
			BTreeDatabaseConfig dbConfig = new BTreeDatabaseConfig();
			dbConfig.Creation = CreatePolicy.IF_NEEDED;
			dbConfig.Env = env;
			BTreeDatabase db = BTreeDatabase.Open(
			    testName + ".db", dbConfig, txn);
			db.Put(new DatabaseEntry(
			    ASCIIEncoding.ASCII.GetBytes("key")),
			    new DatabaseEntry(
			    ASCIIEncoding.ASCII.GetBytes("data")), txn);
			db.Close();
			txn.Commit();
			env.Close();
		}

		[Test]
		public void TestBeginTransaction()
		{
			testName = "TestBeginTransaction";
			SetUpTest(true);

			// Open an environment.
			DatabaseEnvironmentConfig cfg =
			    new DatabaseEnvironmentConfig();
			cfg.Create = true;
			cfg.UseTxns = true;
			cfg.UseMPool = true;
			cfg.UseLogging = true;
			cfg.UseLocking = true;
			cfg.NoLocking = false;
			cfg.FreeThreaded = true;
			testBeginTransactionEnv = DatabaseEnvironment.Open(testHome, cfg);
			testBeginTransactionEnv.DeadlockResolution = DeadlockPolicy.OLDEST;

			// Open btree database.
			BTreeDatabaseConfig dbConfig = new BTreeDatabaseConfig();
			dbConfig.AutoCommit = true;
			dbConfig.Creation = CreatePolicy.IF_NEEDED;
			dbConfig.Env = testBeginTransactionEnv;
			dbConfig.Duplicates = DuplicatesPolicy.NONE;
			dbConfig.FreeThreaded = true;
			testBeginTransactionDB = BTreeDatabase.Open(
			    testName + ".db", dbConfig);

			testBeginTransactionDB.Put(
			    new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("key")),
			    new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("data")));

			// Begin two threads to run dead lock detection.
			Thread thread1 = new Thread(new ThreadStart(
			    DeadLockThreadWithLockTimeOut));
			Thread thread2 = new Thread(new ThreadStart(
			    DeadLockThreadWithTxnTimeout));
			signal = new EventWaitHandle(false, EventResetMode.ManualReset);
			thread1.Start();
			thread2.Start();
			Thread.Sleep(1000);
			signal.Set();
			thread1.Join();
			thread2.Join();

			// Close all.
			testBeginTransactionDB.Close();
			testBeginTransactionEnv.Close();
		}

		public void DeadLockThreadWithLockTimeOut()
		{
			// Configure and begin a transaction.
			TransactionConfig txnConfig = new TransactionConfig();
			txnConfig.LockTimeout = 5000;
			txnConfig.Name = "DeadLockThreadWithLockTimeOut";
			Transaction txn = 
			    testBeginTransactionEnv.BeginTransaction(txnConfig, null);
			try
			{
				testBeginTransactionDB.Put(
				    new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("key")),
				    new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("data")));
				signal.WaitOne();
				testBeginTransactionDB.Put(
				    new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("newkey")),
				    new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("newdata")),
				    txn);
				txn.Commit();
			}
			catch (DeadlockException)
			{
				try
				{
					txn.Abort();
				}
				catch (DatabaseException)
				{
					throw new TestException();
				}
			}
			catch (DatabaseException)
			{
				try
				{
					txn.Abort();
				}
				catch (DatabaseException)
				{
					throw new TestException();
				}
			}
		}

		public void DeadLockThreadWithTxnTimeout()
		{
			// Configure and begin a transaction.
			TransactionConfig txnConfig = new TransactionConfig();
			txnConfig.TxnTimeout = 5000;
			txnConfig.Name = "DeadLockThreadWithTxnTimeout";
			Transaction txn =
			    testBeginTransactionEnv.BeginTransaction(txnConfig, null);
			try
			{
				testBeginTransactionDB.Put(
				    new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("key")),
				    new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("data")));
				signal.WaitOne();
				testBeginTransactionDB.Put(
				    new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("newkey")),
				    new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("newdata")),
				    txn);
				txn.Commit();
			}
			catch (DeadlockException)
			{
				try
				{
					txn.Abort();
				}
				catch (DatabaseException)
				{
					throw new TestException();
				}
			}
			catch (DatabaseException)
			{
				try
				{
					txn.Abort();
				}
				catch (DatabaseException)
				{
					throw new TestException();
				}
			}
		}

		[Test]
		public void TestCheckpoint()
		{
			testName = "TestCheckpoint";
			SetUpTest(true);

			// Open an environment.
			DatabaseEnvironmentConfig cfg =
			    new DatabaseEnvironmentConfig();
			cfg.Create = true;
			cfg.UseTxns = true;
			cfg.UseMPool = true;
			cfg.UseLogging = true;
			cfg.UseLocking = true;
			cfg.NoLocking = false;
			cfg.FreeThreaded = true;
			testCheckpointEnv = DatabaseEnvironment.Open(testHome, cfg);

			// Open btree database.
			BTreeDatabaseConfig dbConfig = new BTreeDatabaseConfig();
			dbConfig.AutoCommit = true;
			dbConfig.Creation = CreatePolicy.IF_NEEDED;
			dbConfig.Env = testCheckpointEnv;
			dbConfig.FreeThreaded = true;
			testCheckpointDB = BTreeDatabase.Open(testName + ".db", dbConfig);

			// Run a thread to put records into database.
			Thread thread1 = new Thread(new ThreadStart(PutRecordsThread));

			/*
			 * Run a thread to do checkpoint periodically and
			 * finally do a checkpoint to flush all in memory pool
			 * to log files.
			 */
			Thread thread2 = new Thread(new ThreadStart(CheckpointThread));

			thread1.Start();
			thread2.Start();
			thread1.Join();
			thread2.Join();

			// Close all.
			testCheckpointDB.Close();
			testCheckpointEnv.Close();
		}

		public void PutRecordsThread()
		{
			Transaction txn = testCheckpointEnv.BeginTransaction();
			byte[] byteArr = new byte[1024];
			for (int i = 0; i < 1000; i++)
				testCheckpointDB.Put(
				    new DatabaseEntry(BitConverter.GetBytes(i)),
				    new DatabaseEntry(byteArr), txn);
			txn.Commit();
		}

		public void CheckpointThread()
		{
			uint bytes = 64;
			uint minutes = 1;
			uint count = 1;
			while (count < 3)
			{
				testCheckpointEnv.Checkpoint(bytes, minutes);
				count++;
			}
			Thread.Sleep(500);
			testCheckpointEnv.Checkpoint();
		}

		[Test]
		public void TestClose()
		{
			testName = "TestClose";
			SetUpTest(true);

			DatabaseEnvironmentConfig cfg =
			    new DatabaseEnvironmentConfig();
			cfg.Create = true;
			DatabaseEnvironment env = DatabaseEnvironment.Open(
			    testHome, cfg);
			env.Close();
		}

		[Test]
		public void TestConfigAll()
		{
			testName = "TestConfigAll";
			SetUpTest(true);

			XmlElement xmlElem = Configuration.TestSetUp(
			    testFixtureName, testName);

			/*
			 * Open a new environment with all properties,
			 * fields and subsystems configured.
			 */
			DatabaseEnvironmentConfig envConig =
			    new DatabaseEnvironmentConfig();
			Config(xmlElem, ref envConig, true, true, true,
			    true, true, true);

			// Configure with methods.
			ReplicationHostAddress address =
			    new ReplicationHostAddress("127.0.0.0", 11111);
			envConig.RepSystemCfg.Clockskew(102, 100);
			envConig.RepSystemCfg.RetransmissionRequest(10, 100);
			envConig.RepSystemCfg.TransmitLimit(1, 1024);

			// Open the environment.
			DatabaseEnvironment env = DatabaseEnvironment.Open(
			    testHome, envConig);

			// Confirm environment status with its configuration.
			Confirm(xmlElem, env, true, true, true, true, true, true);

			// Print statistics of the current environment.
			env.PrintStats(true, true);

			// Print statistics of all subsytems.
			env.PrintSubsystemStats(true, true);

			env.Close();
		}

		[Test]
		public void TestDeadlockPolicy()
		{
			testName = "TestDeadlockPolicy";
			SetUpTest(true);

			DetectDeadlockPolicy(testHome + "_DEFAULT",
			    DeadlockPolicy.DEFAULT);

			DetectDeadlockPolicy(testHome + "_EXPIRE",
			    DeadlockPolicy.EXPIRE);
			DetectDeadlockPolicy(testHome + "_MAX_LOCKS",
			    DeadlockPolicy.MAX_LOCKS);
			DetectDeadlockPolicy(testHome + "_MAX_WRITE",
			    DeadlockPolicy.MAX_WRITE);
			DetectDeadlockPolicy(testHome + "_MIN_LOCKS",
			    DeadlockPolicy.MIN_LOCKS);
			DetectDeadlockPolicy(testHome + "_MIN_WRITE",
			    DeadlockPolicy.MIN_WRITE);
			DetectDeadlockPolicy(testHome + "_OLDEST",
			    DeadlockPolicy.OLDEST);
			DetectDeadlockPolicy(testHome + "_RANDOM",
			    DeadlockPolicy.RANDOM);
			DetectDeadlockPolicy(testHome + "_YOUNGEST",
			    DeadlockPolicy.YOUNGEST);
		}

		public void DetectDeadlockPolicy(
		    string home, DeadlockPolicy deadlock)
		{
			Configuration.ClearDir(home);
			DatabaseEnvironmentConfig envConfig =
			    new DatabaseEnvironmentConfig();
			envConfig.Create = true;
			envConfig.UseLocking = true;
			envConfig.UseLogging = true;
			envConfig.UseMPool = true;
			envConfig.UseTxns = true;
			DatabaseEnvironment env = DatabaseEnvironment.Open(
			    home, envConfig);
			env.DeadlockResolution = deadlock;
			Assert.AreEqual(deadlock, env.DeadlockResolution);
			env.DetectDeadlocks(deadlock);
			env.Close();
		}

		[Test]
		public void TestDetectDeadlocks()
		{
			testName = "TestDetectDeadlocks";
			SetUpTest(true);

			// Open an environment.
			DatabaseEnvironmentConfig cfg =
			    new DatabaseEnvironmentConfig();
			cfg.Create = true;
			cfg.UseTxns = true;
			cfg.UseMPool = true;
			cfg.UseLogging = true;
			cfg.UseLocking = true;
			cfg.FreeThreaded = true;
			testDetectDeadlocksEnv = DatabaseEnvironment.Open(
			    testHome, cfg);

			// Open btree database.
			BTreeDatabaseConfig dbConfig = new BTreeDatabaseConfig();
			dbConfig.AutoCommit = true;
			dbConfig.Creation = CreatePolicy.IF_NEEDED;
			dbConfig.Env = testDetectDeadlocksEnv;
			dbConfig.Duplicates = DuplicatesPolicy.NONE;
			dbConfig.FreeThreaded = true;
			testDetectDeadlocksDB = BTreeDatabase.Open(
			    testName + ".db", dbConfig);

			// Put one record("key", "data") into database.
			testDetectDeadlocksDB.Put(
			    new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("key")),
			    new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("data")));

			// Begin two threads to read and write record.
			Thread thread1 = new Thread(new ThreadStart(ReadAndPutRecordThread));
			Thread thread2 = new Thread(new ThreadStart(ReadAndPutRecordThread));
			signal = new EventWaitHandle(false, EventResetMode.ManualReset);
			thread1.Start();
			thread2.Start();

			// Give enough time for threads to read record.
			Thread.Sleep(1000);

			/*
			 * Let the two threads apply for write lock
			 * synchronously.
			 */
			signal.Set();

			// Confirm that there is deadlock in the environment.
			Thread.Sleep(1000);
			uint deadlockNum = testDetectDeadlocksEnv.DetectDeadlocks(
			    DeadlockPolicy.DEFAULT);
			Assert.Less(0, deadlockNum);

			thread1.Join();
			thread2.Join();

			// Close all.
			testDetectDeadlocksDB.Close(false);
			testDetectDeadlocksEnv.Close();
		}

		public void ReadAndPutRecordThread()
		{
			Transaction txn =
			    testDetectDeadlocksEnv.BeginTransaction();
			try
			{
				testDetectDeadlocksDB.GetBoth(
				    new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("key")),
				    new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("data")), txn);
				signal.WaitOne();
				testDetectDeadlocksDB.Put(
				    new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("newKey")),
				    new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("newData")),
				    txn);
				txn.Commit();
			}
			catch (DeadlockException)
			{
				txn.Abort();
			}
		}

		[Test]
		public void TestEncryption() 
		{
			testName = "TestEncryption";
			SetUpTest(true);

			// Open an encrypted environment.
			DatabaseEnvironmentConfig envCfg =
			    new DatabaseEnvironmentConfig();
			envCfg.Create = true;
			envCfg.UseMPool = true;
			envCfg.UseLogging = true;
			envCfg.UseTxns = true;
			envCfg.SetEncryption("bdb", EncryptionAlgorithm.AES);
			DatabaseEnvironment env =
			DatabaseEnvironment.Open(testHome, envCfg);
			Transaction txn = env.BeginTransaction();

			// Open a non-encrypted database in the environment.
			BTreeDatabaseConfig dbCfg =
			    new BTreeDatabaseConfig();
			dbCfg.Creation = CreatePolicy.IF_NEEDED;
			dbCfg.Env = env;
			BTreeDatabase db1 = BTreeDatabase.Open(
			    testName + "1.db", dbCfg, txn);
			Assert.IsFalse(db1.Encrypted);
			for (int i = 0; i < 10; i++)
				db1.Put(new DatabaseEntry(
				    BitConverter.GetBytes(i)),
				    new DatabaseEntry(
				    BitConverter.GetBytes(i)), txn);

			// Open an encrypted database in the environment.
			dbCfg.Encrypted = true;
			BTreeDatabase db2 = BTreeDatabase.Open(
			    testName + "2.db", dbCfg, txn);
			Assert.IsTrue(db2.Encrypted);
			for (int i = 0; i < 10; i++)
			db2.Put(new DatabaseEntry(BitConverter.GetBytes(i)),
			    new DatabaseEntry(BitConverter.GetBytes(i)), txn);

			// Close all.
			txn.Commit();
			db1.Close();
			db2.Close();
			env.Close();

			// Verify the environment is encrypted.
			DatabaseEnvironmentConfig verifyEnvCfg =
			    new DatabaseEnvironmentConfig();
			verifyEnvCfg.Create = true;
			verifyEnvCfg.UseMPool = true;
			verifyEnvCfg.UseLogging = true;
			verifyEnvCfg.UseTxns = true;
			try {
				env = DatabaseEnvironment.Open(
				    testHome, verifyEnvCfg);
				// Do nothing
				env.Close();
				throw new TestException();
			} catch (DatabaseException) {
			}

			// Verify the non-encrypted database is not encrypted.
			BTreeDatabaseConfig verifyDbCfg =
			    new BTreeDatabaseConfig();
			verifyDbCfg.Creation = CreatePolicy.IF_NEEDED;

			using (db1 = BTreeDatabase.Open(
			    testHome + "/" + testName + "1.db", verifyDbCfg)) {
				for (int i = 0; i < 10; i++)
					db1.Get(new DatabaseEntry(
					    BitConverter.GetBytes(i)));
			};

			/// Verify the encrypted database is encrypted.
			verifyDbCfg.SetEncryption(envCfg.EncryptionPassword,
			    envCfg.EncryptAlgorithm);
			verifyDbCfg.Encrypted = true;
			using (db1 = BTreeDatabase.Open(
			    testHome + "/" + testName + "2.db",
			    verifyDbCfg)) {
				for (int i = 0; i < 10; i++)
					db1.Get(new DatabaseEntry(
					    BitConverter.GetBytes(i)));
			};
		}

		[Test]
		public void TestFailCheck()
		{
			testName = "TestFailCheck";
			SetUpTest(true);

			DatabaseEnvironmentConfig cfg =
			    new DatabaseEnvironmentConfig();
			cfg.Create = true;
			cfg.UseTxns = true;
			cfg.UseMPool = true;
			cfg.UseLogging = true;
			cfg.UseLocking = true;
			cfg.FreeThreaded = true;
			cfg.ThreadIsAlive = new ThreadIsAliveDelegate(ThrdAlive);
			cfg.SetThreadID = new SetThreadIDDelegate(SetThrdID);
			cfg.ThreadCount = 10;
			testFailCheckEnv = DatabaseEnvironment.Open(testHome, cfg);

			Thread thread = new Thread(new ThreadStart(WriteThreadWithoutTxnCommit));
			thread.Start();
			thread.Join();
			testFailCheckEnv.FailCheck();
			testFailCheckEnv.Close();
		}

		public void WriteThreadWithoutTxnCommit()
		{
			Transaction txn = testFailCheckEnv.BeginTransaction();
			BTreeDatabaseConfig dbConfig = new BTreeDatabaseConfig();
			dbConfig.Creation = CreatePolicy.IF_NEEDED;
			dbConfig.Env = testFailCheckEnv;
			BTreeDatabase db = BTreeDatabase.Open("TestFailCheck.db", dbConfig, txn);
			db.Close();
			txn.Commit();
		}

		public bool ThrdAlive(DbThreadID info, bool procOnly)
		{
			Process pcs = Process.GetProcessById(info.processID);
			if (pcs.HasExited == true)
				return false;
			else if (procOnly)
				return true;
			ProcessThreadCollection thrds = pcs.Threads;
			foreach (ProcessThread pcsThrd in thrds)
			{
				if (pcsThrd.Id == info.threadID)
				{
					/*
					 * We have to use the fully qualified name, ThreadState
					 * defaults to System.Threading.ThreadState.
					 */
					return (pcsThrd.ThreadState !=
						System.Diagnostics.ThreadState.Terminated);
				}
			}
			// If we can't find the thread, we say it's not alive
			return false;
		}

		public DbThreadID SetThrdID()
		{
			DbThreadID threadID;

			int pid = Process.GetCurrentProcess().Id;
			uint tid = (uint)AppDomain.GetCurrentThreadId();
			threadID = new DbThreadID(pid, tid);
			return threadID;
		}

		[Test]
		public void TestFeedback()
		{
			testName = "TestFeedback";
			SetUpTest(true);

			// Open the environment.
			DatabaseEnvironmentConfig cfg =
			    new DatabaseEnvironmentConfig();
			cfg.AutoCommit = true;
			cfg.UseLocking = true;
			cfg.UseLogging = true;
			cfg.UseMPool = true;
			cfg.UseTxns = true;
			cfg.Create = true;
			DatabaseEnvironment env = DatabaseEnvironment.Open(testHome, cfg);

			env.Feedback = new EnvironmentFeedbackDelegate(
			    EnvRecovery10PercentFeedback);
			env.Feedback(EnvironmentFeedbackEvent.RECOVERY, 10);

			env.Close();
		}

		public void EnvRecovery10PercentFeedback(
		    EnvironmentFeedbackEvent opcode, int percent)
		{
			Assert.AreEqual(opcode, EnvironmentFeedbackEvent.RECOVERY);
			Assert.AreEqual(10, percent);
		}

		[Test]
		public void TestMutexSystemStats()
		{
			testName = "TestMutexSystemStats";
			SetUpTest(true);

			DatabaseEnvironmentConfig cfg =
			    new DatabaseEnvironmentConfig();
			cfg.Create = true;
			cfg.UseLogging = true;
			cfg.UseLocking = true;
			cfg.UseMPool = true;
			cfg.UseTxns = true;
			cfg.MutexSystemCfg = new MutexConfig();
			cfg.MutexSystemCfg.Alignment = 512;
			cfg.MutexSystemCfg.Increment = 128;
			cfg.MutexSystemCfg.MaxMutexes = 150;
			cfg.MutexSystemCfg.NumTestAndSetSpins = 10;
			DatabaseEnvironment env = DatabaseEnvironment.Open(testHome, cfg);

			MutexStats stats = env.MutexSystemStats();
			env.PrintMutexSystemStats(true, true);
			Assert.AreEqual(512, stats.Alignment);
			Assert.AreEqual(stats.Count, stats.Available + stats.InUse);
			Assert.LessOrEqual(stats.InUse, stats.MaxInUse);
			Assert.AreNotEqual(0, stats.InitCount);
			Assert.AreNotEqual(0, stats.Max);
			Assert.AreNotEqual(0, stats.RegionMax);
			Assert.AreNotEqual(0, stats.RegionSize);
			Assert.AreEqual(0, stats.RegionWait);
			Assert.AreEqual(10, stats.TASSpins);
			ulong regionNoWait = stats.RegionNoWait;

			BTreeDatabaseConfig dbCfg = new BTreeDatabaseConfig();
			dbCfg.Creation = CreatePolicy.IF_NEEDED;
			dbCfg.Env = env;
			BTreeDatabase db = BTreeDatabase.Open(testName + ".db", dbCfg);
			for (int i = 0; i < 1000; i++)
			{
				db.Put(new DatabaseEntry(BitConverter.GetBytes(i)),
				    new DatabaseEntry(BitConverter.GetBytes(i)));
				stats = env.MutexSystemStats();
			}
			Assert.LessOrEqual(regionNoWait, stats.RegionNoWait);
			regionNoWait = stats.RegionNoWait;

			stats = env.MutexSystemStats(true);
			env.PrintMutexSystemStats();
			stats = env.MutexSystemStats();
			Assert.GreaterOrEqual(regionNoWait, stats.RegionNoWait);

			db.Close();
			env.Close();
		}

		[Test]
		public void TestLogFile()
		{
			testName = "TestLogFile";
			SetUpTest(true);

			// Open environment and configure logging subsystem.
			DatabaseEnvironmentConfig cfg =
			    new DatabaseEnvironmentConfig();
			cfg.Create = true;
			cfg.UseTxns = true;
			cfg.AutoCommit = true;
			cfg.UseLocking = true;
			cfg.UseMPool = true;
			cfg.UseLogging = true;
			cfg.MPoolSystemCfg = new MPoolConfig();
			cfg.MPoolSystemCfg.CacheSize = 
			    new CacheInfo(0, 1048576, 1);
			cfg.LogSystemCfg = new LogConfig();
			cfg.LogSystemCfg.AutoRemove = false;
			cfg.LogSystemCfg.BufferSize = 10240;
			cfg.LogSystemCfg.Dir = "./";
			cfg.LogSystemCfg.FileMode = 755;
			cfg.LogSystemCfg.ForceSync = true;
			cfg.LogSystemCfg.InMemory = false;
			cfg.LogSystemCfg.MaxFileSize = 1048576;
			cfg.LogSystemCfg.NoBuffer = false;
			cfg.LogSystemCfg.RegionSize = 204800;
			cfg.LogSystemCfg.ZeroOnCreate = true;
			DatabaseEnvironment env = DatabaseEnvironment.Open(testHome, cfg);

			// Open database.
			Transaction allTxn = env.BeginTransaction();
			TransactionConfig txnConfig = new TransactionConfig();
			txnConfig.Name = "OpenTransaction";
			Transaction openTxn = env.BeginTransaction(txnConfig, allTxn);
			BTreeDatabaseConfig dbConfig = new BTreeDatabaseConfig();
			dbConfig.Creation = CreatePolicy.IF_NEEDED;
			dbConfig.Env = env;
			BTreeDatabase db = BTreeDatabase.Open(
			    testName + ".db", dbConfig, openTxn);

			List<ActiveTransaction> activeTxns =
			    env.TransactionSystemStats().Transactions;
			for (int i = 0; i < activeTxns.Count; i++)
				if (activeTxns[i].Name == "OpenTransaction")
				{
					LSN lsn = new LSN(
					    activeTxns[i].Begun.LogFileNumber,
					    activeTxns[i].Begun.Offset);
					env.LogFlush(lsn);
					string fileName = env.LogFile(lsn);
				}

			openTxn.Commit();

			// Write "##" to log before putting data into database.
			env.WriteToLog("##");

			// Write 1000 records into database.
			TransactionConfig writeTxnConfig = new TransactionConfig();
			writeTxnConfig.Name = "WriteTxn";
			Transaction writeTxn = env.BeginTransaction(writeTxnConfig, allTxn);
			byte[] byteArr = new byte[1024];
			for (int i = 0; i < 1000; i++)
			{
				db.Put(new DatabaseEntry(BitConverter.GetBytes(i)),
				    new DatabaseEntry(byteArr), writeTxn);
				env.LogFlush();
				env.WriteToLog("#" + i.ToString(), writeTxn);
			}

			activeTxns = env.TransactionSystemStats().Transactions;
			for (int i = 0; i < activeTxns.Count; i++)
				if (activeTxns[i].Name == "WriteTxn")
				{
					LSN lsn = new LSN(
					    activeTxns[i].Begun.LogFileNumber,
					    activeTxns[i].Begun.Offset);
					env.LogFlush(lsn);
					string fileName = env.LogFile(lsn);
				}

			writeTxn.Commit();
			db.Close();

			// Write "##" after data has been put.
			env.WriteToLog("##");

			List<string> logFiles = env.LogFiles(true);

			env.LogWrite(new DatabaseEntry(), true);

			env.RemoveUnusedLogFiles();

			allTxn.Commit();
			env.Close();
		}

		[Test]
		public void TestLogVerifyConfig()
		{
			testName = "TestLogVerifyConfig";
			SetUpTest(true);

			// Open enviornment.
			DatabaseEnvironmentConfig cfg =
			    new DatabaseEnvironmentConfig();
			cfg.Create = true;
			cfg.UseLocking = true;
			cfg.UseLogging = true;
			cfg.UseMPool = true;
			cfg.UseTxns = true;
			DatabaseEnvironment env = DatabaseEnvironment.Open(
			    testHome, cfg);

			// Open database.
			Transaction txn = env.BeginTransaction();
			BTreeDatabaseConfig dbCfg = new BTreeDatabaseConfig();
			dbCfg.Env = env;
			dbCfg.Creation = CreatePolicy.IF_NEEDED;
			dbCfg.Duplicates = DuplicatesPolicy.UNSORTED;
			BTreeDatabase db = BTreeDatabase.Open(
			    testName, dbCfg, txn);
			txn.Commit();

			// Do a lot of transactional operations to create logs.
			DatabaseEntry key, data;
			for (int i = 0; i < 5; i++) {
				txn = env.BeginTransaction();
				switch (i) {
				case 0:
					/* 
					 * Put 1000 records and commit the 
					 * transaction.
					 */ 						 
					for (int j = 0; j < 1000;j++) {
						key = new DatabaseEntry(
						    BitConverter.GetBytes(j));
						data = new DatabaseEntry(
						    BitConverter.GetBytes(j));
						db.Put(key, data, txn);
					}
					txn.Commit();
					break;
				case 1:
					/*
					 * Put 10 overflow records and commit 
					 * the transaction.
					 */ 					 
					for (int j = 0; j < 10;j++) {
						key = new DatabaseEntry(
						    BitConverter.GetBytes(j));
						data = new DatabaseEntry(
						    new byte[1024 * 4]);
						db.Put(key, data, txn);
					}
					txn.Commit();
					break;
				case 2:
					/*
					 * Put 1000 records and abort the 
					 * transaction.
					 */ 					 
					for (int j = 0; j < 1000;j++) {
						key = new DatabaseEntry(
						    BitConverter.GetBytes(j));
						data = new DatabaseEntry(
						    BitConverter.GetBytes(j + 1));
						db.Put(key, data, txn);
					}
					txn.Abort();
					break;
				case 3:
					/*
					 * Put 10 overflow records and abort the
					 * transaction.
					 */ 					 
					for (int j = 10; j < 20;j++) {
						key = new DatabaseEntry(
						    BitConverter.GetBytes(j));
						data = new DatabaseEntry(
						    new byte[1024 * 4]);
						db.Put(key, data, txn);
					}
					txn.Abort();
					break;
				case 4:
					// Get 100 records.
					for (int j = 100; j < 200; j++) {
						key = new DatabaseEntry(
						    BitConverter.GetBytes(j));
						data = new DatabaseEntry(
						    BitConverter.GetBytes(j));
						db.GetBoth(key, data, txn);
					}
					txn.Commit();
					break;
				}
			}

			// Verfiy entire log.
			string tempHome = testHome + "_tmp";
			Configuration.ClearDir(tempHome);
			LogVerifyConfig logVerifyCfg = new LogVerifyConfig();
			logVerifyCfg.CacheSize = 1024 * 10;
			logVerifyCfg.ContinueAfterFail = true;
			logVerifyCfg.EnvHome = tempHome;
			logVerifyCfg.Verbose = true;
			Assert.AreEqual(0, env.LogVerify(logVerifyCfg));
			db.Close();
			env.Close();

			// Verify specific database.
			logVerifyCfg.DbFile = testName + ".db";
			logVerifyCfg.DbName = testName;
			Assert.AreEqual(0, env.LogVerify(logVerifyCfg));

			// Verify partial log.
			DateTime time = DateTime.Now;
			DateTime startTime = time.AddMinutes(-2);
			DateTime endTime = time.AddMinutes(-1);
			logVerifyCfg.StartTime = startTime;
			logVerifyCfg.EndTime = endTime;
			Assert.AreEqual(0, env.LogVerify(logVerifyCfg));

			// Verfiy unexisting log.
			logVerifyCfg.StartLsn = new LSN(1, 3);
			logVerifyCfg.EndLsn = new LSN(2, 100);
			Assert.AreEqual(0, env.LogVerify(logVerifyCfg));

			Assert.AreEqual(logVerifyCfg.CacheSize, 1024 * 10);
			Assert.AreEqual(logVerifyCfg.ContinueAfterFail, true);
			Assert.AreEqual(logVerifyCfg.DbFile, testName + ".db");
			Assert.AreEqual(logVerifyCfg.DbName, testName);
			Assert.AreEqual(logVerifyCfg.EndLsn.LogFileNumber, 2);
			Assert.AreEqual(logVerifyCfg.EndLsn.Offset, 100);
			Assert.AreEqual(logVerifyCfg.EndTime, endTime);
			Assert.AreEqual(logVerifyCfg.EnvHome, testHome + "_tmp");
			Assert.AreEqual(logVerifyCfg.StartLsn.LogFileNumber, 1);
			Assert.AreEqual(logVerifyCfg.StartLsn.Offset, 3);
			Assert.AreEqual(logVerifyCfg.StartTime, startTime);
			Assert.AreEqual(logVerifyCfg.Verbose, true);
		}

		[Test]
		public void TestOpen()
		{
			testName = "TestOpen";
			SetUpTest(true);

			DatabaseEnvironmentConfig cfg =
			    new DatabaseEnvironmentConfig();
			cfg.Create = true;
			DatabaseEnvironment env = DatabaseEnvironment.Open(testHome, cfg);

			// Confirm that the environment is initialized.
			Assert.IsNotNull(env);

			// Confirm the environment home directory.
			Assert.AreEqual(testHome, env.Home);

			// Print statistics of the current environment.
			env.PrintStats();

			// Print statistics of all subsytems.
			env.PrintSubsystemStats();

			env.Close();
		}

		[Test]
		public void TestMPoolSystemStats()
		{
			testName = "TestMPoolSystemStats";
			SetUpTest(true);

			DatabaseEnvironmentConfig envConfig =
			    new DatabaseEnvironmentConfig();
			envConfig.AutoCommit = true;
			envConfig.MPoolSystemCfg = new MPoolConfig();
			envConfig.MPoolSystemCfg.CacheSize = 
			    new CacheInfo(0, 1048576, 3);
			envConfig.Create = true;
			envConfig.UseLocking = true;
			envConfig.UseLogging = true;
			envConfig.UseMPool = true;
			envConfig.UseTxns = true;

			DatabaseEnvironment env = DatabaseEnvironment.Open(
			    testHome, envConfig);

			MPoolStats stats = env.MPoolSystemStats();
			env.PrintMPoolSystemStats();

			Assert.AreEqual(0, stats.BlockedOperations);
			Assert.AreEqual(0, stats.BucketsCheckedDuringAlloc);
			Assert.AreEqual(3, stats.CacheRegions);
			Assert.LessOrEqual(1048576, stats.CacheSettings.Bytes);
			Assert.AreEqual(0, stats.CacheSettings.Gigabytes);
			Assert.AreEqual(3, stats.CacheSettings.NCaches);
			Assert.AreEqual(0, stats.CleanPages);
			Assert.AreEqual(0, stats.CleanPagesEvicted);
			Assert.AreEqual(0, stats.DirtyPages);
			Assert.AreEqual(0, stats.DirtyPagesEvicted);
			Assert.IsNotNull(stats.Files);
			Assert.AreEqual(0, stats.FrozenBuffers);
			Assert.AreEqual(0, stats.FrozenBuffersFreed);
			Assert.LessOrEqual(stats.HashBuckets, 
			    stats.HashBucketMutexes);
			Assert.LessOrEqual(37, stats.HashBuckets);
			Assert.LessOrEqual(0, stats.HashChainSearches);
			Assert.AreEqual(0, stats.HashEntriesSearched);
			Assert.AreEqual(0, stats.HashLockNoWait);
			Assert.AreEqual(0, stats.HashLockWait);
			Assert.AreEqual(0, stats.LongestHashChainSearch);
			Assert.AreEqual(0, stats.MappedPages);
			Assert.AreEqual(0, stats.MaxBucketsCheckedDuringAlloc);
			Assert.AreEqual(0, stats.MaxBufferWrites);
			Assert.AreEqual(0, stats.MaxBufferWritesSleep);
			Assert.AreEqual(0, stats.MaxHashLockNoWait);
			Assert.AreEqual(0, stats.MaxHashLockWait);
			Assert.AreEqual(0, stats.MaxMMapSize);
			Assert.AreEqual(0, stats.MaxOpenFileDescriptors);
			Assert.AreEqual(0, stats.MaxPagesCheckedDuringAlloc);
			Assert.AreEqual(0, stats.PageAllocations);
			Assert.AreEqual(0, stats.Pages);
			Assert.AreEqual(0, stats.PagesCheckedDuringAlloc);
			Assert.LessOrEqual(0, stats.PagesCreatedInCache);
			Assert.AreEqual(0, stats.PagesInCache);
			Assert.AreEqual(0, stats.PagesNotInCache);
			Assert.AreEqual(0, stats.PagesRead);
			Assert.AreEqual(0, stats.PagesTrickled);
			Assert.AreEqual(0, stats.PagesWritten);
			Assert.AreNotEqual(0, stats.RegionLockNoWait);
			Assert.AreEqual(0, stats.RegionLockWait);
			Assert.LessOrEqual(0, stats.RegionSize);
			Assert.AreNotEqual(0, stats.RegionMax);
			Assert.AreEqual(0, stats.ThawedBuffers);

			Transaction txn = env.BeginTransaction();
			BTreeDatabaseConfig dbConfig = new BTreeDatabaseConfig();
			dbConfig.Creation = CreatePolicy.IF_NEEDED;
			dbConfig.Env = env;
			dbConfig.PageSize = 4096;
			BTreeDatabase db = BTreeDatabase.Open(
			    testName + ".db", dbConfig, txn);

			stats = env.MPoolSystemStats();
			Assert.AreEqual(1, stats.Files.Count);
			Assert.AreEqual(testName + ".db", stats.Files[0].FileName);
			Assert.AreEqual(0, stats.Files[0].MappedPages);
			Assert.AreEqual(0, stats.Files[0].PagesCreatedInCache);
			Assert.AreEqual(0, stats.Files[0].PagesInCache);
			Assert.AreEqual(4096, stats.Files[0].PageSize);
			Assert.LessOrEqual(1, stats.Files[0].PagesNotInCache);
			Assert.AreEqual(1, stats.Files[0].PagesRead);
			Assert.AreEqual(0, stats.Files[0].PagesWritten);

			byte[] largeByte = new byte[1088576];
			for (int i = 0; i < 10; i++)
				db.Put(new DatabaseEntry(BitConverter.GetBytes(i)), 
				    new DatabaseEntry(largeByte), txn);
			db.Put(new DatabaseEntry(largeByte), 
			    new DatabaseEntry(largeByte), txn);

			stats = env.MPoolSystemStats();
			Assert.Less(0, stats.Files[0].PagesCreatedInCache);
			Assert.Less(0, stats.Files[0].PagesInCache);
			Assert.LessOrEqual(1, stats.Files[0].PagesNotInCache);
			Assert.LessOrEqual(1, stats.Files[0].PagesRead);
			Assert.Less(0, stats.Files[0].PagesWritten);

			txn.Commit();
			db.Close();

			// Clean the stats after printing.
			stats = env.MPoolSystemStats(true);
			env.PrintMPoolSystemStats(true, true);
			stats = env.MPoolSystemStats();
			env.PrintMPoolSystemStats(true, true, true);

			env.Close();
		}

		[Test]
		public void TestRemove()
		{
			testName = "TestRemove";
			SetUpTest(true);

			// Open new environment.
			DatabaseEnvironmentConfig envConig = 
			    new DatabaseEnvironmentConfig();
			envConig.Create = true;
			envConig.ErrorPrefix = testFixtureName + ":" + testName;
			DatabaseEnvironment env = DatabaseEnvironment.Open(
			    testHome, envConig);
			env.Close();

			// Remove the existing environment.
			DatabaseEnvironment.Remove(testHome);

			// Confirm that the __db.001 is removed.
			Assert.IsFalse(File.Exists(testHome + "__db.001"));
		}

		[Test]
		public void TestRemoveCorruptedEnv()
		{
			testName = "TestRemoveCorruptedEnv";
			SetUpTest(true);

			// Open new environment.
			DatabaseEnvironmentConfig envConig =
			    new DatabaseEnvironmentConfig();
			envConig.Create = true;
			envConig.ErrorPrefix = testFixtureName + ":" + testName;
			DatabaseEnvironment env = DatabaseEnvironment.Open(testHome, envConig);

			// Panic the environment.
			env.Panic();

			// Remove the corrupted environment.
			DatabaseEnvironment.Remove(testHome, true);

			// Confirm that the __db.001 is removed.
			Assert.IsFalse(File.Exists(testHome + "__db.001"));
		}

		[Test, ExpectedException(typeof(ExpectedTestException))]
		public void TestRenameDB()
		{
			testName = "TestRenameDB";
			SetUpTest(true);

			RenameDB(testHome, testName, false);
		}

		[Test, ExpectedException(typeof(ExpectedTestException))]
		public void TestRenameDBWithTxn()
		{
			testName = "TestRenameDBWithTxn";
			SetUpTest(true);

			RenameDB(testHome, testName, true);
		}

		public void RenameDB(string home, string name, bool ifTxn)
		{
			string dbFileName = name + ".db";
			string dbName = "db1";
			string dbNewName = "db2";

			Configuration.ClearDir(home);

			DatabaseEnvironmentConfig envConig =
			    new DatabaseEnvironmentConfig();
			envConig.Create = true;
			envConig.UseTxns = true;
			envConig.UseLogging = true;
			envConig.UseMPool = true;
			DatabaseEnvironment env = DatabaseEnvironment.Open(
			    home, envConig);

			Transaction openTxn = env.BeginTransaction();
			BTreeDatabaseConfig dbConfig =
			    new BTreeDatabaseConfig();
			dbConfig.Creation = CreatePolicy.IF_NEEDED;
			dbConfig.Env = env;
			BTreeDatabase db = BTreeDatabase.Open(
			    dbFileName, dbName, dbConfig, openTxn);
			db.Close();
			openTxn.Commit();

			// Open the database.
			if (ifTxn == false)
				env.RenameDB(dbFileName, dbName, dbNewName, true);
			else
			{
				Transaction renameTxn = env.BeginTransaction();
				env.RenameDB(dbFileName, dbName, dbNewName, false, renameTxn);
				renameTxn.Commit();
			}

			// Confirm that the database are renamed.
			Transaction reopenTxn = env.BeginTransaction();
			try
			{
				Database db1 = Database.Open(
				    dbFileName, new DatabaseConfig());
				db1.Close();
			}
			catch (DatabaseException)
			{
				throw new ExpectedTestException();
			}
			finally
			{
				reopenTxn.Commit();
				env.Close();
			}
		}

		[Test]
		public void TestResetFileID()
		{
			testName = "TestResetFileID";
			SetUpTest(true);
			string dbFileName = testName + ".db";
			string dbNewFileName = testName + "_new.db";

			DatabaseEnvironmentConfig envConfig =
			    new DatabaseEnvironmentConfig();
			envConfig.Create = true;
			envConfig.UseMPool = true;
			DatabaseEnvironment env = DatabaseEnvironment.Open(
			    testHome, envConfig);

			// Opening a new database.
			BTreeDatabaseConfig dbConfig =
			    new BTreeDatabaseConfig();
			dbConfig.Creation = CreatePolicy.IF_NEEDED;
			dbConfig.Env = env;
			BTreeDatabase db = BTreeDatabase.Open(
			    dbFileName, dbConfig);
			db.Close();

			// Copy the physical database file.
			File.Copy(testHome + "/" + dbFileName,
			    testHome + "/" + dbNewFileName);

			// Reset the file ID.
			env.ResetFileID(dbNewFileName, false);

			// Open the exisiting database in copied database file.
			BTreeDatabaseConfig cfg = new BTreeDatabaseConfig();
			cfg.Creation = CreatePolicy.NEVER;
			cfg.Env = env;
			BTreeDatabase newDB = BTreeDatabase.Open(
			    dbNewFileName, cfg);
			newDB.Close();
			env.Close();
		}

		[Test, ExpectedException(typeof(ExpectedTestException))]
		public void TestRemoveDB()
		{
			testName = "TestRemoveDB";
			SetUpTest(true);

			RmDBWithoutTxn(testHome, testName, false);
		}

		[Test, ExpectedException(typeof(ExpectedTestException))]
		public void TestRemoveDBWithAutoCommit()
		{
			testName = "TestRemoveDBWithAutoCommit";
			SetUpTest(true);

			RmDBWithoutTxn(testHome, testName, true);
		}

		[Test, ExpectedException(typeof(ExpectedTestException))]
		public void TestRemoveDBWithinTxn()
		{
			testName = "TestRemoveDBWithinTxn";
			SetUpTest(true);
			string dbFileName = testName + ".db";
			string dbName1 = testName + "1";
			string dbName2 = testName + "2";

			// Open environment.
			DatabaseEnvironmentConfig envConfig =
			    new DatabaseEnvironmentConfig();
			envConfig.Create = true;
			envConfig.UseMPool = true;
			envConfig.UseTxns = true;
			envConfig.UseLogging = true;
			DatabaseEnvironment env = DatabaseEnvironment.Open(
			    testHome, envConfig);
			Transaction txn = env.BeginTransaction();

			// Create two databases in the environment.
			BTreeDatabaseConfig dbConfig =
			    new BTreeDatabaseConfig();
			dbConfig.Creation = CreatePolicy.IF_NEEDED;
			dbConfig.Env = env;
			BTreeDatabase btreeDB1 = BTreeDatabase.Open(
			    dbFileName, dbName1, dbConfig, txn);
			btreeDB1.Close();
			BTreeDatabase btreeDB2 = BTreeDatabase.Open(
			    dbFileName, dbName2, dbConfig, txn);
			btreeDB2.Close();

			// Remove one database from the environment.
			env.RemoveDB(dbFileName, dbName2, false, txn);

			// Try to open the existing database.
			DatabaseConfig cfg = new DatabaseConfig();
			cfg.Env = env;
			Database db1 = Database.Open(dbFileName, dbName1, cfg, txn);
			db1.Close();

			/*
			 * Attempting to open the removed database should
			 * cause error.
			 */
			try
			{
				Database db2 = Database.Open(
				    dbFileName, dbName2, cfg, txn);
				db2.Close();
			}
			catch (DatabaseException)
			{
				throw new ExpectedTestException();
			}
			finally
			{
				txn.Commit();
				env.Close();
			}
		}

		public void RmDBWithoutTxn(string home, string dbName,
		    bool ifAutoCommit)
		{
			string dbFileName = dbName + ".db";
			string dbName1 = dbName + "1";
			string dbName2 = dbName + "2";

			// Open environment.
			DatabaseEnvironmentConfig envConfig =
			    new DatabaseEnvironmentConfig();
			envConfig.Create = true;
			envConfig.UseMPool = true;
			if (ifAutoCommit == true)
			{
				envConfig.AutoCommit = true;
				envConfig.UseTxns = true;
			}

			DatabaseEnvironment env = DatabaseEnvironment.Open(
			    home, envConfig);

			// Create two databases in the environment.
			BTreeDatabaseConfig dbConfig =
			    new BTreeDatabaseConfig();
			dbConfig.Creation = CreatePolicy.IF_NEEDED;
			dbConfig.Env = env;
			BTreeDatabase btreeDB1 = BTreeDatabase.Open(
			    dbFileName, dbName1, dbConfig);
			btreeDB1.Close();
			BTreeDatabase btreeDB2 = BTreeDatabase.Open(
			    dbFileName, dbName2, dbConfig);
			btreeDB2.Close();

			// Remove one database from the environment.
			env.RemoveDB(dbFileName, dbName2, false);

			// Try to open the existing database.
			DatabaseConfig cfg = new DatabaseConfig();
			cfg.Env = env;
			Database db1 = Database.Open(dbFileName, dbName1, cfg);
			db1.Close();

			/*
			 * Attempting to open the removed database should
			 * cause error.
			 */
			try
			{
				Database db2 = Database.Open(
				    dbFileName, dbName2, cfg);
				db2.Close();
			}
			catch (DatabaseException)
			{
				throw new ExpectedTestException();
			}
			finally
			{
				env.Close();
			}
		}

		[Test]
		public void TestTransactionSystemStats()
		{
			testName = "TestTransactionSystemStats";
			SetUpTest(true);

			TransactionStats stats;
			BTreeDatabase db;
			Transaction openTxn = null;

			// Open an environment.
			long dateTime;
			DatabaseEnvironmentConfig envConfig =
			    new DatabaseEnvironmentConfig();
			envConfig.Create = true;
			envConfig.MaxTransactions = 50;
			envConfig.UseLogging = true;
            envConfig.UseLocking = true;
			envConfig.UseMPool = true;
			envConfig.UseTxns = true;
			envConfig.TxnNoSync = false;
			envConfig.TxnNoWait = true;
			envConfig.TxnSnapshot = true;
			envConfig.TxnTimestamp = DateTime.Now;
			envConfig.TxnWriteNoSync = false;
			DatabaseEnvironment env = DatabaseEnvironment.Open(
			    testHome, envConfig);

			try
			{
				try
				{
					// Confirm initial transaction subsystem statistics.
					stats = env.TransactionSystemStats();
					env.PrintTransactionSystemStats(true, true);
					Assert.AreEqual(0, stats.Aborted);
					Assert.AreEqual(0, stats.Active);
					Assert.AreEqual(0, stats.Begun);
					Assert.AreEqual(0, stats.Committed);
					Assert.AreEqual(0, stats.InitTxns);
					Assert.AreEqual(0, stats.LastCheckpoint.LogFileNumber);
					Assert.AreEqual(0, stats.LastCheckpoint.Offset);
					Assert.AreEqual(50, stats.MaxTransactions);
					Assert.AreNotEqual(0, stats.RegionSize);
					Assert.AreEqual(0, stats.Transactions.Count);
				}
				catch (AssertionException e)
				{
					throw e;
				}

				try
				{
					//Begin a transaction called openTxn and open a database.
					TransactionConfig openTxnCfg = new TransactionConfig();
					openTxnCfg.Name = "openTxn";
					openTxn = env.BeginTransaction(openTxnCfg);
					openTxn.Priority = 50;
					BTreeDatabaseConfig dbConfig = new BTreeDatabaseConfig();
					dbConfig.Creation = CreatePolicy.IF_NEEDED;
					dbConfig.Env = env;
					db = BTreeDatabase.Open(testName + ".db", dbConfig, openTxn);
				}
				catch (DatabaseException e)
				{
					if (openTxn != null)
						openTxn.Abort();
					throw e;
				}

				try
				{
					// At least there is one transaction that is alive.
					env.Checkpoint();
					stats = env.TransactionSystemStats();
					env.PrintTransactionSystemStats();
					Assert.AreNotEqual(0, stats.Active);
					Assert.AreNotEqual(0, stats.Transactions.Count);
					Assert.AreNotEqual(0, stats.Transactions.Capacity);
					Assert.AreNotEqual(0, stats.RegionLockNoWait);
					dateTime = stats.LastCheckpointTime;

					// Begin an embedded transaction called putTxn.
					TransactionConfig putTxnCfg =
					    new TransactionConfig();
					putTxnCfg.Name = "putTxn";
					putTxnCfg.NoWait = false;
					Transaction putTxn = env.BeginTransaction(
					    putTxnCfg, openTxn);
					putTxn.Priority = 50;

					try
					{
						// Put some records into database within putTxn.
						for (int i = 0; i < 50; i++)
							db.Put(new DatabaseEntry(BitConverter.GetBytes(i)), 
							    new DatabaseEntry(BitConverter.GetBytes(i)), putTxn);
							stats = env.TransactionSystemStats();
							Assert.AreNotEqual(0, stats.MaxActive);
							Assert.AreNotEqual(0, stats.MaxTransactions);
							Assert.AreEqual(0, stats.MaxSnapshot);
							Assert.AreEqual(0, stats.Snapshot);
							Assert.AreEqual(stats.Begun, 
							    stats.Aborted + stats.Active + stats.Committed);
							Assert.AreEqual(2, stats.Transactions.Count);

						/*
						 * Both of LogFileNumber and Offset in active transaction
						 * couldn't be 0.
						 */ 
						uint logFileNumbers = 0;
						uint offSets = 0;
						for (int i = 0; i < stats.Transactions.Count;i++)
						{
							logFileNumbers += stats.Transactions[i].Begun.LogFileNumber;
							offSets += stats.Transactions[i].Begun.Offset;
						}
						Assert.AreNotEqual(0, logFileNumbers);
						Assert.AreNotEqual(0, offSets);

						// All active transactions are run by the same process and thread.

						Assert.AreEqual(stats.Transactions[0].ThreadID, 
						    stats.Transactions[1].ThreadID);
						Assert.AreEqual(stats.Transactions[0].ProcessID,
						    stats.Transactions[1].ProcessID);

						// All transactions are alive.
						Assert.AreEqual(ActiveTransaction.TransactionStatus.RUNNING,
						    stats.Transactions[0].Status);
						Assert.AreEqual(ActiveTransaction.TransactionStatus.RUNNING,
						    stats.Transactions[1].Status);

						Assert.AreEqual(50, stats.Transactions[0].Priority);
						Assert.AreEqual(50, stats.Transactions[1].Priority);

						/*
						 * Find the openTxn in active transactions, which is the
						 * parent transaction of putTxn.
						 */
						int parentPos = 0;
						if (stats.Transactions[0].Name == "putTxn")
							parentPos = 1;

						// putTxn's parent id should be the openTxn.
						Assert.AreEqual(stats.Transactions[parentPos].ID,
						    stats.Transactions[1 - parentPos].ParentID);

						// Other stats should be an positive integer.
						for (int i = 0; i < stats.Transactions.Count - 1; i++)
						{
							Assert.LessOrEqual(0, 
							    stats.Transactions[i].BufferCopiesInCache);
							Assert.LessOrEqual(0, 
							    stats.Transactions[i].SnapshotReads.LogFileNumber);
							Assert.LessOrEqual(0,
							    stats.Transactions[i].SnapshotReads.Offset);
							Assert.IsNotNull(stats.Transactions[i].GlobalID);
						}

						// Commit putTxn.
						putTxn.Commit();
					}
					catch (DatabaseException e)
					{
						putTxn.Abort();
						throw e;
					}

					stats = env.TransactionSystemStats();
					Assert.AreNotEqual(0, stats.LastCheckpoint.LogFileNumber);
					Assert.AreNotEqual(0, stats.LastCheckpoint.Offset);
					Assert.AreEqual(dateTime, stats.LastCheckpointTime);

					openTxn.Commit();
				}
				catch (DatabaseException e)
				{
					openTxn.Abort();
					throw e;
				}
				finally
				{
					db.Close();
				}
			}
			finally
			{
				env.Close();
			}
		}

		/*
		 * Configure an environment. Here only configure those that could be 
		 * set before environment open.
		 */
		public void Config(XmlElement xmlElem, 
		    ref DatabaseEnvironmentConfig envConfig, bool compulsory, 
		    bool logging, bool locking, bool mutex, bool mpool, bool replication)
		{
			XmlNode childNode;

			// Configure environment without any subsystems.
			DatabaseEnvironmentConfigTest.Config(xmlElem, ref envConfig, compulsory);

			// Configure environment with logging subsystem.
			if (logging == true)
			{
				childNode = XMLReader.GetNode(xmlElem, "LogConfig");
				envConfig.LogSystemCfg = new LogConfig();
				LogConfigTest.Config((XmlElement)childNode, 
				    ref envConfig.LogSystemCfg, compulsory);
			}

			// Configure environment with locking subsystem.
			if (locking == true)
			{
				childNode = XMLReader.GetNode(xmlElem, "LockingConfig");
				envConfig.LockSystemCfg = new LockingConfig();
				LockingConfigTest.Config((XmlElement)childNode,
				    ref envConfig.LockSystemCfg, compulsory);
			}

			// Configure environment with mutex subsystem.
			if (mutex == true)
			{
				childNode = XMLReader.GetNode(xmlElem, "MutexConfig");
				envConfig.MutexSystemCfg = new MutexConfig();
				MutexConfigTest.Config((XmlElement)childNode,
				    ref envConfig.MutexSystemCfg, compulsory);
			}

			if (mpool == true)
			{
				childNode = XMLReader.GetNode(xmlElem, "MPoolConfig");
				envConfig.MPoolSystemCfg = new MPoolConfig();
				MPoolConfigTest.Config((XmlElement)childNode,
				    ref envConfig.MPoolSystemCfg, compulsory);
			}

			// Configure environment with replication.
			if (replication == true)
			{
				childNode = XMLReader.GetNode(xmlElem, "ReplicationConfig");
				envConfig.RepSystemCfg = new ReplicationConfig();
				ReplicationConfigTest.Config((XmlElement)childNode,
				    ref envConfig.RepSystemCfg, compulsory);
			}
		}

		/*
		 * Confirm the fields/properties in the environment.
		 * Those set by setting functions are not checked here.
		 */
		public static void Confirm(XmlElement xmlElement,
		    DatabaseEnvironment env, bool compulsory,
		    bool logging, bool locking, bool mutex, bool mpool,
		    bool replication)
		{
			XmlElement childElem;
			CacheInfo cacheInfo = new CacheInfo(0, 0, 0);

			// Confirm environment configuration.
			Configuration.ConfirmBool(xmlElement, "AutoCommit",
			    env.AutoCommit, compulsory);
			Configuration.ConfirmBool(xmlElement, "CDB_ALLDB",
			    env.CDB_ALLDB, compulsory);
			Configuration.ConfirmBool(xmlElement, "Create",
			    env.Create, compulsory);
			Configuration.ConfirmStringList(xmlElement, "DataDirs",
			    env.DataDirs, compulsory);
			Configuration.ConfirmString(xmlElement, "ErrorPrefix",
			    env.ErrorPrefix, compulsory);
			Configuration.ConfirmBool(xmlElement, "ForceFlush",
			    env.ForceFlush, compulsory);
			Configuration.ConfirmBool(xmlElement, "FreeThreaded",
			    env.FreeThreaded, compulsory);
			Configuration.ConfirmBool(xmlElement, "InitRegions",
			    env.InitRegions, compulsory);
			Configuration.ConfirmString(xmlElement, "IntermediateDirMode",
			    env.IntermediateDirMode, compulsory);
			Configuration.ConfirmBool(xmlElement, "Lockdown",
			    env.Lockdown, compulsory);
			Configuration.ConfirmUint(xmlElement, "LockTimeout",
			    env.LockTimeout, compulsory);
			Configuration.ConfirmUint(xmlElement, "MaxTransactions",
			    env.MaxTransactions, compulsory);
			Configuration.ConfirmBool(xmlElement, "NoBuffer",
			    env.NoBuffer, compulsory);
			Configuration.ConfirmBool(xmlElement, "NoLocking",
			    env.NoLocking, compulsory);
			Configuration.ConfirmBool(xmlElement, "NoMMap",
			    env.NoMMap, compulsory);
			Configuration.ConfirmBool(xmlElement, "NoPanic",
			    env.NoPanic, compulsory);
			Configuration.ConfirmBool(xmlElement, "Overwrite",
			    env.Overwrite, compulsory);
			Configuration.ConfirmBool(xmlElement, "Private",
			    env.Private, compulsory);
			Configuration.ConfirmBool(xmlElement, "Register",
			    env.Register, compulsory);
			Configuration.ConfirmBool(xmlElement, "RunFatalRecovery", 
			    env.RunFatalRecovery, compulsory);
			Configuration.ConfirmBool(xmlElement, "RunRecovery",
			    env.RunRecovery, compulsory);
			Configuration.ConfirmBool(xmlElement, "SystemMemory",
			    env.SystemMemory, compulsory);
			Configuration.ConfirmString(xmlElement, "TempDir",
			    env.TempDir, compulsory);
			Configuration.ConfirmBool(xmlElement, "TimeNotGranted",
			    env.TimeNotGranted, compulsory);
			Configuration.ConfirmBool(xmlElement, "TxnNoSync",
			    env.TxnNoSync, compulsory);
			Configuration.ConfirmBool(xmlElement, "TxnNoWait",
			    env.TxnNoWait, compulsory);
			Configuration.ConfirmBool(xmlElement, "TxnSnapshot",
			    env.TxnSnapshot, compulsory);
			Configuration.ConfirmDateTime(xmlElement, "TxnTimestamp", 
			    env.TxnTimestamp, compulsory);
			Configuration.ConfirmBool(xmlElement, "TxnWriteNoSync",
			    env.TxnWriteNoSync, compulsory);
			Configuration.ConfirmBool(xmlElement, "UseMVCC",
			    env.UseMVCC, compulsory);
			Configuration.ConfirmBool(xmlElement, "UseCDB",
			    env.UsingCDB, compulsory);
			Configuration.ConfirmBool(xmlElement, "UseLocking",
			    env.UsingLocking, compulsory);
			Configuration.ConfirmBool(xmlElement, "UseLogging",
			    env.UsingLogging, compulsory);
			Configuration.ConfirmBool(xmlElement, "UseMPool",
			    env.UsingMPool, compulsory);
			Configuration.ConfirmBool(xmlElement, "UseReplication",
			    env.UsingReplication, compulsory);
			Configuration.ConfirmBool(xmlElement, "UseTxns",
			    env.UsingTxns, compulsory);
			env.Verbosity = new VerboseMessages();
			Configuration.ConfirmVerboseMessages(xmlElement,
			    "Verbosity", env.Verbosity, compulsory);
			Configuration.ConfirmBool(xmlElement, "YieldCPU",
			    env.YieldCPU, compulsory);

			/*
			 * If the locking subsystem is set, check the
			 * field/properties set in LockingConfig.
			 */
			if (locking == true)
			{
				childElem = (XmlElement)XMLReader.GetNode(
				    xmlElement, "LockingConfig");
				Configuration.ConfirmByteMatrix(childElem,
				    "Conflicts", env.LockConflictMatrix,
				    compulsory);
				Configuration.ConfirmDeadlockPolicy(
				    childElem, "DeadlockResolution",
				    env.DeadlockResolution, compulsory);
				Configuration.ConfirmUint(childElem,
				    "Partitions", env.LockPartitions,
				    compulsory);
				Configuration.ConfirmUint(childElem,
				    "MaxLockers", env.MaxLockers, compulsory);
				Configuration.ConfirmUint(childElem,
				    "MaxLocks", env.MaxLocks, compulsory);
				Configuration.ConfirmUint(childElem,
				    "MaxObjects", env.MaxObjects, compulsory);
			}

			/*
			 * If the locking subsystem is set, check the
			 * field/properties set in LogConfig.
			 */
			if (logging == true)
			{
				childElem = (XmlElement)XMLReader.GetNode(
				    xmlElement, "LogConfig");
				Configuration.ConfirmBool(childElem,
				    "AutoRemove", env.LogAutoRemove,
				    compulsory);
				Configuration.ConfirmUint(childElem,
				    "BufferSize", env.LogBufferSize,
				    compulsory);
				Configuration.ConfirmString(childElem,
				    "Dir", env.LogDir, compulsory);
				Configuration.ConfirmInt(childElem,
				    "FileMode", env.LogFileMode, compulsory);
				Configuration.ConfirmBool(childElem,
				    "ForceSync", env.LogForceSync, compulsory);
				Configuration.ConfirmBool(childElem,
				    "InMemory", env.LogInMemory, compulsory);
				Configuration.ConfirmBool(childElem,
				    "NoBuffer", env.LogNoBuffer, compulsory);
				Configuration.ConfirmUint(childElem,
				    "RegionSize", env.LogRegionSize,
				    compulsory);
				Configuration.ConfirmBool(childElem,
				    "ZeroOnCreate", env.LogZeroOnCreate,
				    compulsory);
				Configuration.ConfirmUint(childElem,
				    "MaxFileSize", env.MaxLogFileSize,
				    compulsory);
			}

			/*
			 * If the locking subsystem is set, check the
			 * field/properties set in MutexConfig.
			 */
			if (mutex == true)
			{
				childElem = (XmlElement)XMLReader.GetNode(
				    xmlElement, "MutexConfig");
				Configuration.ConfirmUint(childElem,
				    "Alignment", env.MutexAlignment, 
				    compulsory);
				Configuration.ConfirmUint(childElem,
				    "MaxMutexes", env.MaxMutexes, compulsory);
				try
				{
					Configuration.ConfirmUint(childElem,
					    "Increment", env.MutexIncrement,
					    compulsory);
				}
				catch (AssertionException)
				{
					Assert.AreEqual(0, env.MutexIncrement);
				}

				Configuration.ConfirmUint(childElem,
				    "NumTestAndSetSpins",
				    env.NumTestAndSetSpins, compulsory);
			}

			if (mpool == true)
			{
				childElem = (XmlElement)XMLReader.GetNode(
				    xmlElement, "MPoolConfig");
				Configuration.ConfirmCacheSize(childElem,
				    "CacheSize", env.CacheSize, compulsory);
				if (env.UsingMPool == false)
					Configuration.ConfirmCacheSize(childElem,
					    "MaxCacheSize", env.MaxCacheSize, compulsory);
				Configuration.ConfirmInt(childElem,
				    "MaxOpenFiles", env.MaxOpenFiles, compulsory);
				Configuration.ConfirmMaxSequentialWrites(childElem, 
				    "MaxSequentialWrites", env.SequentialWritePause,
				    env.MaxSequentialWrites, compulsory);
				Configuration.ConfirmUint(childElem,
				    "MMapSize", env.MMapSize, compulsory);
			}

			if (replication == true)
			{
				childElem = (XmlElement)XMLReader.GetNode(
				    xmlElement, "ReplicationConfig");
				Configuration.ConfirmUint(childElem,
				    "AckTimeout", env.RepAckTimeout, compulsory);
				Configuration.ConfirmBool(childElem,
				    "BulkTransfer", env.RepBulkTransfer, compulsory);
				Configuration.ConfirmUint(childElem,
				    "CheckpointDelay", env.RepCheckpointDelay, compulsory);
				Configuration.ConfirmUint(childElem,
				    "ConnectionRetry", env.RepConnectionRetry, compulsory);
				Configuration.ConfirmBool(childElem,
				    "DelayClientSync", env.RepDelayClientSync, compulsory);
				Configuration.ConfirmUint(childElem,
				    "ElectionRetry", env.RepElectionRetry, compulsory);
				Configuration.ConfirmUint(childElem,
				    "ElectionTimeout", env.RepElectionTimeout, compulsory);
				Configuration.ConfirmUint(childElem,
				    "FullElectionTimeout", env.RepFullElectionTimeout,compulsory);
				Configuration.ConfirmUint(childElem,
				    "HeartbeatMonitor", env.RepHeartbeatMonitor, compulsory);
				Configuration.ConfirmUint(childElem,
				    "HeartbeatSend", env.RepHeartbeatSend, compulsory);
				Configuration.ConfirmUint(childElem,
				    "LeaseTimeout", env.RepLeaseTimeout, compulsory);
				Configuration.ConfirmBool(childElem,
				    "AutoInit", env.RepAutoInit, compulsory);
				Configuration.ConfirmBool(childElem,
				    "NoBlocking", env.RepNoBlocking, compulsory);
				Configuration.ConfirmUint(childElem,
				    "Priority", env.RepPriority, compulsory);
				Configuration.ConfirmAckPolicy(childElem,
				    "RepMgrAckPolicy", env.RepMgrAckPolicy, compulsory);
				Configuration.ConfirmBool(childElem,
				    "Strict2Site", env.RepStrict2Site, compulsory);
				Configuration.ConfirmBool(childElem,
				    "UseMasterLeases", env.RepUseMasterLeases, compulsory);
			}
		}
	}
}