Measures reported by MariaTransTest
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 the target Maria Database server being monitored.
| Measurement |
Description |
Measurement Unit |
Interpretation |
| User_commits |
Indicates the number of user commits that have happened during the last measurement period. |
Number |
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| 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. |
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