| Property | Description |
|---|---|
| Parameter type | Integer |
| Default value | 512 KB or 128 KB * CPU_COUNT, whichever is greater |
| Modifiable | No |
| Range of values | Operating system-dependent |
| Basic | No |
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:
Oracle Database Performance Tuning Guide for more information on setting this parameter
Your operating system-specific Oracle documentation for the default value and range of values