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TIBCO iProcess® Engine 11.9.1

# WQS_PERSIST_SHMEM

WIS and WQS Process Configuration

## Summary

This attribute defines how often (in seconds) the contents of the `WQS`/`WIS` shared memory are written to the `wqs_index` table in the database.

## Applies To

This attribute can be set for the `WQS` process (only).

## Permissible Values

The attribute value must be an integer in the range 1 to 3600.

## Default Value

The attribute is assigned the following default value when iProcess Engine is installed.

Machine ID | Process | Instance | Value
0 | WQS | 0 | 300

## Notes

When the `WIS` process starts up, it uses the `total_items` column in the `wqs_index` table to determine the number of work items in each work queue. It compares this value to the WIS_CACHE_THRESHOLD value to determine whether to cache the work queue.

If TIBCO iProcess Engine is started, cases are loaded into a work queue, then the system is shut down again within the `WQS_PERSIST_SHMEM` value, the item counts in the `wqs_index` table will not match the actual item counts.

See Configuring When WIS Processes Cache Their Queues for more information.

## See Also

WIS_CACHE_THRESHOLD

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