# Berkeley DB: DbEnv.set_lg_max
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++

# DbEnv.set_lg_max

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    import com.sleepycat.db.*;

    public void set_lg_max(int lg_max)
        throws DbException;

# Description

Set the maximum size of a single file in the log, in bytes. Because DbLsn file offsets are unsigned four-byte values, the set value may not be larger than the maximum unsigned four-byte value. By default, or if the value is set to 0, a size of 10MB is used. 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 DbEnv.set_lg_max interface may be used only to configure Berkeley DB before the DbEnv.open interface is called.

The DbEnv.set_lg_max method throws an exception that encapsulates a non-zero error value on failure.

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

The DbEnv.set_lg_max method may fail and throw an exception encapsulating a non-zero error for the following conditions:

EINVAL
  An invalid flag value or parameter was specified.

  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.

The DbEnv.set_lg_max method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods. If a catastrophic error has occurred, the DbEnv.set_lg_max method may fail and throw a DbRunRecoveryException, in which case all subsequent Berkeley DB calls will fail in the same way.

# Class

DbEnv

# See Also

DbEnv.set_lg_bsize, DbEnv.set_lg_dir, DbEnv.set_lg_max, DbEnv.set_lg_regionmax, DbEnv.log_archive, DbEnv.log_compare, DbEnv.log_cursor, DbEnv.log_file, DbEnv.log_flush, DbEnv.log_put, DbEnv.log_register, DbEnv.log_stat, DbEnv.log_unregister, DbLogc.logc_close and DbLogc.logc_get.`

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