1.170 LOG_BUFFER
LOG_BUFFER specifies the amount of memory (in bytes) that Oracle uses when buffering redo entries to a redo log file.
| Property | Description |
|---|---|
|
Parameter type |
Big integer |
|
Default value |
2 MB to 32 MB, depending on the SGA size and CPU count |
|
Modifiable |
No |
|
Modifiable in a PDB |
No |
|
Range of values |
2 MB to operating system-dependent |
|
Basic |
No |
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.
The log buffer size depends on the number of redo strands in the system. One redo strand is allocated for every 16 CPUs and has a default size of 2 MB. Oracle allocates a minimum of 2 redo strands per instance. When the log buffer size is not specified, any remaining memory in the redo granules is given to the log buffer.
See Also:
-
Your operating system-specific Oracle documentation for the default value and range of values
-
Oracle Streams Replication Administrator's Guide for information on using this parameter in an Oracle Streams environment
-
Oracle Database Performance Tuning Guide for information on resizing the redo log buffer using this parameter