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This is documentation for Caché & Ensemble.

For information on converting to InterSystems IRIS, see the InterSystems IRIS Adoption Guide and the InterSystems IRIS In-Place Conversion Guide, both available on the WRC Distributions page (login required).

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Size of memory for journal buffers.


[config]    jrnbufs=n


Amount of memory allocated for journal buffers. The default is 64 MB. Increasing this setting means increasing the amount of journal data that can be held in memory, which improves journaling performance but increases the amount of journal data that could potentially be lost in the event of a system failure. If you edit this setting, you must restart Caché to apply the change.




Range of Values

8 MB (for 8–bit instances) or 16 MB (for Unicode instances) up to 1024 MB.

Management Portal

On the Advanced Memory Settings page (System Administration > Configuration > Additional Settings > Advanced memory), in the jrnbufs row, select Edit and enter a number of megabytes.