Purpose
Determines whether changed data blocks are written directly to disk or to the Write-Ahead Logging (WAL) log.
This field is effective only when WAL is enabled (DisableWAL is set to FALSE).
Field Group
File System
Valid Settings
| Setting | Description |
|---|---|
| TRUE | Changed data blocks are written to disk. |
| FALSE | Changed data blocks are written to the WAL log and cached in memory, or may be written to disk, depending on the specific operation. |
Default
FALSE
Changes Take Effect
After the DBS Control Record has been written.
Usage Notes
WAL is a log-based file system recovery scheme in which modifications to permanent data are written to a log file, the WAL log. The log file contains change records (Redo records) which represent the updates. At key moments, such as transaction commit, the WAL log is forced to disk. In the case of a reset or crash, Redo records can be used to transform the old copy of a permanent data block on disk into the version that existed at the time of the reset.
Related Topics
See DisableWAL.