# DbEnv::set_lg_bsize

`

###

    #include <db_cxx.h>

    int
    DbEnv::set_lg_bsize(u_int32_t lg_bsize);

# Description

Set the size of the in-memory log buffer, in bytes. By default, or if the value is set to 0, a size of 32K is used.

Log information is stored in-memory until the storage space fills up or transaction commit forces the information to be flushed to stable storage. In the presence of long-running transactions or transactions producing large amounts of data, larger buffer sizes can increase throughput.

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

The DbEnv::set_lg_bsize 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 environment's log buffer 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_bsize", one or more whitespace characters, and the size in bytes. Configuration in the DB_CONFIG file silently overrules configuration done using the DbEnv::set_lg_bsize method.

# Errors

EINVAL
  An invalid flag value or parameter was specified.

  Called after DbEnv::open was called.

### 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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