# DbEnv::set_lg_dir

`

###

    #include <db_cxx.h>

    int
    DbEnv::set_lg_dir(const char *dir);

# Description

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 DbEnv::set_lg_dir interface may only be used to configure Berkeley DB before the DbEnv::open interface is called.

The DbEnv::set_lg_dir method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success.

The database environment's logging directory may also be set 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.

# Errors

EINVAL
  An invalid flag value or parameter was specified.

  Called after DbEnv::open was called.

### Class

DbEnv

# See Also

DbEnv::close, DbEnv::open, DbEnv::remove, DbEnv::err, DbEnv::strerror, DbEnv::version, DbEnv::set_cachesize, DbEnv::set_errcall, DbEnv::set_errfile, DbEnv::set_error_stream, DbEnv::set_errpfx, DbEnv::set_flags, DbEnv::set_mutexlocks, DbEnv::set_paniccall, and DbEnv::set_verbose.`

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