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Snapshot Level Database Application |
Logical Data Grouping dbase appl |
Monitor Switch Basic Basic |
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Resettable |
Yes |
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Event Type Database Connection Transaction |
Logical Data Grouping db_event conn_event xaction_event |
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Element Name Element Type |
x_lock_escals counter |
Description: The number of times that locks have been escalated from several row locks to one exclusive table lock, or the number of times an exclusive lock on a row caused the table lock to become an exclusive lock.
Usage: Other applications cannot access data held by an exclusive lock; therefore it is important to track exclusive locks since they can impact the concurrency of your data.
A lock is escalated when the total number of locks held by an application reaches the maximum amount of lock list space available to the application. The amount of lock list space available is determined by the locklist and maxlocks configuration parameters.
When an application reaches the maximum number of locks allowed and there are no more locks to escalate, it will then use space in the lock list allocated for other applications. When the entire lock list is full, an error occurs.
See Number of Lock Escalations for possible causes and resolutions to excessive exclusive lock escalations.
An application may be using exclusive locks when share locks are sufficient. Although share locks may not reduce the total number of lock escalations share lock escalations may be preferable to exclusive lock escalations.