mirror of
https://github.com/berkeleydb/libdb.git
synced 2024-11-17 01:26:25 +00:00
144 lines
6.9 KiB
HTML
144 lines
6.9 KiB
HTML
|
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
|
|||
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|||
|
|
<html xmlns="http://www.w3.org/1999/xhtml">
|
|||
|
|
<head>
|
|||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
|
|||
|
|
<title>set_flags</title>
|
|||
|
|
<link rel="stylesheet" href="apiReference.css" type="text/css" />
|
|||
|
|
<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
|
|||
|
|
<link rel="start" href="index.html" title="Berkeley DB C++ API Reference" />
|
|||
|
|
<link rel="up" href="configuration_reference.html" title="Appendix B. DB_CONFIG Parameter Reference" />
|
|||
|
|
<link rel="prev" href="set_create_dir_parameter.html" title="set_create_dir" />
|
|||
|
|
<link rel="next" href="set_intermediate_dir_mode_parameter.html" title="set_intermediate_dir_mode" />
|
|||
|
|
</head>
|
|||
|
|
<body>
|
|||
|
|
<div xmlns="" class="navheader">
|
|||
|
|
<div class="libver">
|
|||
|
|
<p>Library Version 11.2.5.2</p>
|
|||
|
|
</div>
|
|||
|
|
<table width="100%" summary="Navigation header">
|
|||
|
|
<tr>
|
|||
|
|
<th colspan="3" align="center">set_flags</th>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td width="20%" align="left"><a accesskey="p" href="set_create_dir_parameter.html">Prev</a> </td>
|
|||
|
|
<th width="60%" align="center">Appendix B. DB_CONFIG Parameter Reference</th>
|
|||
|
|
<td width="20%" align="right"> <a accesskey="n" href="set_intermediate_dir_mode_parameter.html">Next</a></td>
|
|||
|
|
</tr>
|
|||
|
|
</table>
|
|||
|
|
<hr />
|
|||
|
|
</div>
|
|||
|
|
<div class="sect1" lang="en" xml:lang="en">
|
|||
|
|
<div class="titlepage">
|
|||
|
|
<div>
|
|||
|
|
<div>
|
|||
|
|
<h2 class="title" style="clear: both"><a id="set_flags_parameter"></a>set_flags</h2>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<p>
|
|||
|
|
Configures a database environment.
|
|||
|
|
</p>
|
|||
|
|
<p>
|
|||
|
|
The syntax of the entry in the <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file is a single
|
|||
|
|
line with the string <code class="literal">set_flags</code>, one or
|
|||
|
|
more whitespace characters, the method flag parameter as a
|
|||
|
|
string, optionally one or more whitespace characters, and
|
|||
|
|
the string <code class="literal">on</code> or <code class="literal">off</code>.
|
|||
|
|
If the optional string is omitted, the default is
|
|||
|
|
<code class="literal">on</code>; for example,
|
|||
|
|
<code class="literal">set_flags DB_TXN_NOSYNC</code> or
|
|||
|
|
<code class="literal">set_flags DB_TXN_NOSYNC on</code>. Because the
|
|||
|
|
DB_CONFIG file is read when the database environment is
|
|||
|
|
opened, it will silently overrule configuration done before
|
|||
|
|
that time.
|
|||
|
|
</p>
|
|||
|
|
<p>
|
|||
|
|
The method flag parameters are as follows:
|
|||
|
|
</p>
|
|||
|
|
<div class="itemizedlist">
|
|||
|
|
<ul type="disc">
|
|||
|
|
<li>
|
|||
|
|
DB_AUTO_COMMIT
|
|||
|
|
<p>
|
|||
|
|
Enables/disables to automatically enclose those DB handle operations for which no explicit transaction handle was specified, and
|
|||
|
|
which modify databases in the database environment, within a transaction.
|
|||
|
|
</p></li>
|
|||
|
|
<li>
|
|||
|
|
DB_CDB_ALLDB
|
|||
|
|
<p>Enables/disables Berkeley DB Concurrent Data Store applications to perform locking on an
|
|||
|
|
environment-wide basis rather than on a per-database basis.</p></li>
|
|||
|
|
<li>
|
|||
|
|
DB_DIRECT_DB
|
|||
|
|
<p>Enables/disables turning off system buffering of Berkeley DB database files to avoid double caching.</p></li>
|
|||
|
|
<li>
|
|||
|
|
DB_DSYNC_DB
|
|||
|
|
<p>Enables/disables configuring Berkeley DB to flush database writes to the backing disk before returning
|
|||
|
|
from the write system call, rather than flushing database writes explicitly in a separate
|
|||
|
|
system call, as necessary.</p></li>
|
|||
|
|
<li>
|
|||
|
|
DB_MULTIVERSION
|
|||
|
|
<p>Enables/disables all databases in the environment from being opened as if DB_MULTIVERSION is passed to
|
|||
|
|
the DB->open method. This flag will be ignored for queue databases for which
|
|||
|
|
DB_MULTIVERSION is not supported.</p></li>
|
|||
|
|
<li>
|
|||
|
|
DB_NOMMAP
|
|||
|
|
<p>Enables/disables Berkeley DB from copying read-only database files into the local cache instead of
|
|||
|
|
potentially mapping them into process memory.</p></li>
|
|||
|
|
<li>
|
|||
|
|
DB_REGION_INIT
|
|||
|
|
<p>Enables/disables Berkeley DB to page-fault shared regions into memory when initially creating or joining a Berkeley DB
|
|||
|
|
environment. In addition, Berkeley DB will write the shared regions when creating an
|
|||
|
|
environment, forcing the underlying virtual memory and filesystems to instantiate both
|
|||
|
|
the necessary memory and the necessary disk space.</p></li>
|
|||
|
|
<li>
|
|||
|
|
DB_TIME_NOTGRANTED
|
|||
|
|
<p>Enables/disables those database calls timing out based on lock or transaction timeout values to return
|
|||
|
|
DB_LOCK_NOTGRANTED instead of DB_LOCK_DEADLOCK. This allows applications to
|
|||
|
|
distinguish between operations which have deadlocked and operations which have exceeded
|
|||
|
|
their time limits.</p></li>
|
|||
|
|
<li>
|
|||
|
|
DB_TXN_NOSYNC
|
|||
|
|
<p>Enables/disables Berkeley DB to not write or synchronously flush the log on transaction commit.</p></li>
|
|||
|
|
<li>
|
|||
|
|
DB_TXN_NOWAIT
|
|||
|
|
<p>Enables/disables the operation to return DB_LOCK_DEADLOCK if a lock is unavailable for any Berkeley DB operation performed in the context of a
|
|||
|
|
transaction.</p></li>
|
|||
|
|
<li>
|
|||
|
|
DB_TXN_SNAPSHOT
|
|||
|
|
<p>Enables/disables all transactions in the environment to be started as if DB_TXN_SNAPSHOT were
|
|||
|
|
passed to the DB_ENV->txn_begin method, and all non-transactional cursors
|
|||
|
|
to be opened as if DB_TXN_SNAPSHOT were passed to the DB->cursor method.</p></li>
|
|||
|
|
<li>
|
|||
|
|
DB_TXN_WRITE_NOSYNC
|
|||
|
|
<p>Enables/disables Berkeley DB to write, but not synchronously flush, the log on transaction
|
|||
|
|
commit.</p></li>
|
|||
|
|
<li>
|
|||
|
|
DB_YIELDCPU
|
|||
|
|
<p>Enables/disables Berkeley DB to yield the processor immediately after each page or mutex acquisition.</p></li>
|
|||
|
|
</ul>
|
|||
|
|
</div>
|
|||
|
|
<p> For more information, see <a class="xref" href="envset_flags.html" title="DbEnv::set_flags()">DbEnv::set_flags()</a>.</p>
|
|||
|
|
</div>
|
|||
|
|
<div class="navfooter">
|
|||
|
|
<hr />
|
|||
|
|
<table width="100%" summary="Navigation footer">
|
|||
|
|
<tr>
|
|||
|
|
<td width="40%" align="left"><a accesskey="p" href="set_create_dir_parameter.html">Prev</a> </td>
|
|||
|
|
<td width="20%" align="center">
|
|||
|
|
<a accesskey="u" href="configuration_reference.html">Up</a>
|
|||
|
|
</td>
|
|||
|
|
<td width="40%" align="right"> <a accesskey="n" href="set_intermediate_dir_mode_parameter.html">Next</a></td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td width="40%" align="left" valign="top">set_create_dir </td>
|
|||
|
|
<td width="20%" align="center">
|
|||
|
|
<a accesskey="h" href="index.html">Home</a>
|
|||
|
|
</td>
|
|||
|
|
<td width="40%" align="right" valign="top"> set_intermediate_dir_mode</td>
|
|||
|
|
</tr>
|
|||
|
|
</table>
|
|||
|
|
</div>
|
|||
|
|
</body>
|
|||
|
|
</html>
|