# Berkeley DB: DB_ENV->set_lg_dir
Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++

# DB_ENV->set_lg_dir

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    #include <db.h>

    int
    DB_ENV->set_lg_dir(DB_ENV *dbenv, 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 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 interface may not be called after the DB_ENV->open interface 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.

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

The DB_ENV->set_lg_dir method may fail and return a non-zero error for the following conditions:

EINVAL
  An invalid flag value or parameter was specified.

  Called after DB_ENV->open was called.

The DB_ENV->set_lg_dir method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the DB_ENV->set_lg_dir method may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

# Class

DB_ENV, DB_LOGC, DB_LSN

# See Also

Logging Subsystem and Related Methods`

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