Server Instance Properties: MSS IMS DB Locking

Use this page to set IMS database locking options.

To access this page:

1. From the Enterprise Server Administration home page, at the left of the Enterprise Server instance to configure, click Edit.
2. On the server instance screen, select the Server > Properties > MSS > IMS > DB > Locking tabs.

Enable IRLM locking

When checked, enables the Internal Lock Resource Manager (IRLM) locking algorithm. IRLM locking more closely parallels mainframe IMS database DB locking behavior, reducing data constraint and potential for deadlock. Maps to the ES_IMS_IRLM environment variable.

Dump on lock timeout

When checked, creates a system dump when IMS DB control is unable to access a locked record before the specified Locked resource timeout period expires. Maps to the ES_IMS_DUMP_ON_TIMEOUT environment variable.

Dump on deadlock

When checked, creates a system dump when a deadlock is detected. Maps to the ES_IMS_DUMP_ON_DEADLOCK environment variable.

Locked resource timeout

The number of seconds during which IMS DB control continues to retry a locked record before timing out. Valid values are 0 to 65535. The default is 30 seconds; a value of 0 indicates an indefinite wait time. Maps to the ES_IMS_LOCK_TIMEOUT environment variable.