RCVOPT parameter: Difference between revisions
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<tr><th><var>X'01'</var></th> | <tr><th><var>X'01'</var></th> | ||
<td>Checkpoints are taken.</td></tr> | <td><var>[[Checkpoints:_Storing_before-images_of_changed_pages|Checkpoints]]</var> are taken.</td></tr> | ||
<tr><th><var>X'08'</var></th> | <tr><th><var>X'08'</var></th> | ||
Revision as of 14:04, 18 May 2017
Recovery options
Summary
- Default value
- 0
- Parameter type
- System
- Where set
- On User 0's parameter line
- Related products
- All
- Introduced
- Model 204 V2.1 or earlier
Description
Valid settings of RCVOPT are (options can be summed):
| Setting | Meaning |
|---|---|
| X'01' | Checkpoints are taken. |
| X'08' | Roll forward information is logged into the journal stream. |
| X'20' | Do not flush the dirty pages in a file that does not do pre-imaging (FRCVOPT X'20' set) during a subtransaction checkpoint. This bit has an effect in Model 204 7.6 and later; for V7.5, it requires an appropriate maintenance zap.
One use of this setting is to set FRCVOPT X'20' for a file that holds SirFact dumps, which can get quite large. This bit prevents a large SirFact dump from causing a subtransaction checkpoint to take a very long time. While this might result in a SirFact dump being lost if the system crashes, such a loss is probably not that critical, so its risk is probably well worth the benefit of faster subtransaction checkpoints. |