Determines whether Write-Ahead Logging (WAL) is enabled.
Field Group
File System
Valid Settings
| Setting | Description |
|---|---|
| TRUE | The WAL feature is disabled. Changed data blocks and cylinder indexes are written directly to disk. The DisableWALforDBs field is ignored. |
| FALSE | The WAL feature is enabled. The items written to the WAL log are determined by the setting of DisableWALforDBs:
|
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.
Data blocks inserted by the MultiLoad utility are always written to disk regardless of the DisableWAL field setting.
Related Information
See DisableWALforDBs.