| Event Id | 160 |
| Source | ESE97 |
| Description | MSExchangeIS (359) Background clean-up skipped pages. Database may benefit from online or offline defragmentation. |
| Event Information | CAUSE: This problem can occur if the information store sets the Max Open Tables and Preferred Max Open Tables values (which regulate the number of Open Tables in the JET database) incorrectly when the information store starts. The calculation to set these values is dependent upon many things and is very complex. The Preferred Max Open Tables value is always set lower than the Max Open Tables value. If the information store reaches the value set by the Preferred Max Open Tables value, JET starts a scan to try to find resources that can be used to comply with more requests for open tables. This scan repeats aggressively, which results in the degradation of the information store process. RESOLUTION: A supported hotfix is now available from Microsoft. |
| Reference Links | Information Store performance degradation caused by excessive scanning in ESE |
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