Specifies conditions under which data blocks (DBs) for spool and volatile tables will be compressed by default.
Compression is subject to the BlockLevelCompression field setting, and to the criteria specified by the MinPercentCompReduction and MinDBSectsToCompress DBS Control fields. DBs not meeting these minimum criteria will not be compressed.
Field Group
Compression
Valid Settings
| Setting | Description |
|---|---|
| ALWAYS | The DBs of a new Spool table will be compressed. |
| NEVER | The DBs of a new Spool table will not be compressed. The Ferret utility COMPRESS command will have no effect. |
| IFNOTCACHED | The DBs of a new table will be compressed if they are not being cached. |
Default
NEVER
Changes Take Effect
After the DBS Control Record has been written.
Usage Notes
BLC enables data compression at the data block (DB) level of the file system. Compression reduces the amount of storage required for a given amount of data. The BlockLevelCompression field of DBS Control enables and disables BLC.
Spool includes Persistent Spool used for the Redrive feature.
Related Information
| For more information on... | See... |
|---|---|
| BlockLevelCompression field | BlockLevelCompression. |
| COMPRESS and UNCOMPRESS commands | Ferret Utility (ferret). |