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Oracle® Database Reference
11g Release 1 (11.1)

Part Number B28320-01
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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.

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