RCVOPT parameter: Difference between revisions
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<table> | <table> | ||
<tr><th>Setting</th><th>Meaning</th></tr> | <tr><th>Setting</th><th>Meaning</th></tr> | ||
<tr><th align="right"><var> | <tr><th align="right"><var>X'01'</var></th><td>Checkpoints are taken.</td></tr> | ||
<tr><th align="right"><var> | <tr><th align="right"><var>X'08'</var></th><td>Roll forward information is logged into the journal stream.</td></tr> | ||
<tr><th align="right"><var>X'20'</var></th><td>Do not flush the dirty pages in a file that does not do pre-imaging ([[FRCVOPT parameter|FRCVOPT]] X'20' set) during a subtransation checkpoint. This bit only has an effect in Model 204 7.6 and later. One use of this setting would be to set FRCVOPT X'20' in a file used to hold SirFact dumps which can get quite large. This would prevent a large SirFact dump from causing a subtransaction checkpoint to take a very long time. While this could result in a SirFact dump being lost if the system crashes, this is probably not that big a deal so the risk is probably well worth the benefit of faster subtransaction checkpoints.</td></tr> | |||
</table> | </table> | ||
[[Category:System parameters]] | [[Category:System parameters]] | ||
[[Category:Parameters]] | [[Category:Parameters]] | ||
Revision as of 21:21, 7 April 2015
Recovery options
Summary
- Default value
- 0
- Parameter type
- System
- Where set
- On User 0's parameter line
- Related products
- All
- Introduced
- Model 204 V6.1 or earlier
Description
The recovery options
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 subtransation checkpoint. This bit only has an effect in Model 204 7.6 and later. One use of this setting would be to set FRCVOPT X'20' in a file used to hold SirFact dumps which can get quite large. This would prevent a large SirFact dump from causing a subtransaction checkpoint to take a very long time. While this could result in a SirFact dump being lost if the system crashes, this is probably not that big a deal so the risk is probably well worth the benefit of faster subtransaction checkpoints. |