#include <db.h>

int
DB_ENV->set_lg_max(DB_ENV *dbenv, u_int32_t lg_max);

int
DB_ENV->get_lg_max(DB_ENV *dbenv, u_int32_t *lg_maxp);

Description: DB_ENV->set_lg_max

Set the maximum size of a single file in the log, in bytes. By default, or if the lg_max parameter is set to 0, a size of 10MB is used. Because DB_LSN file offsets are unsigned four-byte values, the set value may not be larger than the maximum unsigned four-byte value. The size of the log file must be at least four times the size of the in-memory log buffer (see DB_ENV->set_lg_bsize).

See Log File Limits for more information.

The database environment's log file size 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_max", one or more whitespace characters, and the size in bytes. 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_max method configures a database environment, not only operations performed using the specified DB_ENV handle.

The DB_ENV->set_lg_max method may be called at any time during the life of the application.

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

Parameters

lg_max

The lg_max parameter is the size of a single log file, in bytes.

Errors

The DB_ENV->set_lg_max method may fail and return one of the following non-zero errors:

EINVAL

If the method was called after DB_ENV->open was called; the size of the log file is less than four times the size of the in-memory log buffer; The specified log file size was too large; or if an invalid flag value or parameter was specified.

Description: DB_ENV->get_lg_max

The DB_ENV->get_lg_max method returns the maximum log file size.

The DB_ENV->get_lg_max method may be called at any time during the life of the application.

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

Parameters

lg_maxp

The DB_ENV->get_lg_max method returns the maximum log file size in lg_maxp.

Class

See Also