#include <db.h>

int
DB_ENV->set_data_dir(DB_ENV *dbenv, const char *dir);  

Set the path of a directory to be used as the location of the access method database files. Paths specified to the DB->open() function will be searched relative to this path. Paths set using this method are additive, and specifying more than one will result in each specified directory being searched for database files. If any directories are specified, database files will always be created in the first path specified.

If no database directories are specified, database files must be named either by absolute paths or relative to the environment home directory. See Berkeley DB File Naming for more information.

The database environment's data directories may also be configured using the environment's DB_CONFIG file. The syntax of the entry in that file is a single line with the string "set_data_dir", one or more whitespace characters, and the directory name. Note that if you use this method for your application, and you also want to use the db_recover, db_printlog, db_archive, or db_log_verify utilities, then you should set create a DB_CONFIG file and set the "set_data_dir" parameter in it.

The DB_ENV->set_data_dir() method configures operations performed using the specified DB_ENV handle, not all operations performed on the underlying database environment.

The DB_ENV->set_data_dir() method may not be called after the DB_ENV->open() method is called. If the database environment already exists when DB_ENV->open() is called, the information specified to DB_ENV->set_data_dir() must be consistent with the existing environment or corruption can occur.

The DB_ENV->set_data_dir() method returns a non-zero error value on failure and 0 on success.