eG Monitoring
 

Measures reported by TibTransTest

Rollbacks are costly operations on the database. This test monitors the percentage of rollbacks happening for user transactions with a database instance.

Outputs of the test : One set of results for each database server being monitored.

The measures made by this test are as follows:

Measurement Description Measurement Unit Interpretation
User_commits Indicates the number of user commits that have happened during the last measurement period. Number  
User_rollbacks Indicates the number of user rollbacks that have happened during the last measurement period. Number Ideally, there should be few user rollbacks happening.

Typically, whenever a delete, insert or update operation is performed on the database, Undo tablespace is consumed, I/O overheads increase, and considerable server time is spent in performing that operation. When such operations are rolledback, these resources are wasted! To conserve resources, its best to keep rollbacks at a minimum. 
Pct_rollbacks Indicates The number of user rollbacks as a percentage of the total user transactions (user commits + user rollbacks) with the database. Percent The closer the percentage of rollbacks is to zero, the lower the overhead on the database due to rollbacks. The acceptable value of rollbacks will vary from one instance to another and will have to be configured based on the patterns of requests being handled by the database instance.