LOG_BUFFER

Parameter type	Integer
Default value	Maximum is 512 KB or 128 KB * CPU_COUNT, whichever is greater.
Parameter class	Static
Range of values	Operating system-dependent

LOG_BUFFER specifies the amount of memory, in bytes, that Oracle uses when buffering redo entries to a redo log file. Redo log entries contain a record of the changes that have been made to the database block buffers. The LGWR process writes redo log entries from the log buffer to a redo log file.

In general, larger values for LOG_BUFFER reduce redo log file I/O, particularly if transactions are long or numerous. In a busy system, a value 65536 or higher is reasonable.

See Also: Oracle9i Database Performance Guide and Reference for more information on setting this parameter Your operating system-specific Oracle documentation for the default value and range of values