# DbEnv::set_lg_max

`

###

    #include <db_cxx.h>

    int
    DbEnv::set_lg_max(u_int32_t lg_max);

# Description

Set the maximum size of a single file in the log, in bytes. Because DbLsn file offsets are unsigned 4-byte values, the set value may not be larger than the maximum unsigned 4-byte value. By default, or if the value is set to 0, a size of 10MB is used.

See Log File Limits for more information.

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

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.

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.

# Errors

EINVAL
  An invalid flag value or parameter was specified.

  Called after DbEnv::open was called.

  The specified log file size was too large.

### Class

DbEnv

# See Also

DbEnv::set_lg_bsize, DbEnv::set_lg_max, DbEnv::log_archive, DbEnv::log_compare, DbEnv::log_file, DbEnv::log_flush, DbEnv::log_get, DbEnv::log_put, DbEnv::log_register, DbEnv::log_stat and DbEnv::log_unregister.`

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