int DB_ENV->set_lg_dir(DB_ENV *dbenv, const char *dir);
int DB_ENV->get_lg_dir(DB_ENV *dbenv, const char **dirp);
The path of a directory to be used as the location of logging files. Log files created by the Log Manager subsystem will be created in this directory.
If no logging directory is specified, log files are created in the environment home directory. See Berkeley DB File Naming for more information.
For the greatest degree of recoverability from system or application failure, database files and log files should be located on separate physical devices.
The database environment's logging directory 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_lg_dir", one or more whitespace characters, and the directory name. Because the DB_CONFIG file is read when the database environment is opened, it will silently overrule configuration done before that time.
The DB_ENV->set_lg_dir method configures operations performed using the specified DB_ENV handle, not all operations performed on the underlying database environment.
The DB_ENV->set_lg_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_lg_dir must be consistent with the existing environment or corruption can occur.
The DB_ENV->set_lg_dir method returns a non-zero error value on failure and 0 on success.
On Windows, the dir argument will be interpreted as a UTF-8 string, which is equivalent to ASCII for Latin characters.
The DB_ENV->set_lg_dir method may fail and return one of the following non-zero errors:
The DB_ENV->get_lg_dir method returns the log directory.
The DB_ENV->get_lg_dir method may be called at any time during the life of the application.
The DB_ENV->get_lg_dir method returns a non-zero error value on failure and 0 on success.
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