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Oracle9i Database Reference
Release 2 (9.2)

Part Number A96536-02
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Parameter type


Default value

512 KB or 128 KB * CPU_COUNT, whichever is greater

Parameter class


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.

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