#include <db_cxx.h>

int
DbEnv::set_lg_max(u_int32_t lg_max);

int
DbEnv::get_lg_max(u_int32_t *);

Description: DbEnv::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 DbLsn 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 DbEnv::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 DbEnv::set_lg_max method configures a database environment, not only operations performed using the specified DbEnv handle.

The DbEnv::set_lg_max method may be called at any time during the life of the application.

The DbEnv::set_lg_max 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.

Parameters

lg_max

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

Errors

The DbEnv::set_lg_max method may fail and throw DbException, encapsulating one of the following non-zero errors, or return one of the following non-zero errors:

EINVAL

If the method was called after DbEnv::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: DbEnv::get_lg_max

The DbEnv::get_lg_max method returns the maximum log file size.

The DbEnv::get_lg_max method may be called at any time during the life of the application.

The DbEnv::get_lg_max 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.

Parameters

lg_maxp

The DbEnv::get_lg_max method returns the maximum log file size in lg_maxp.

Class

See Also