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Spotlight on SAP ASE 2.12 - User Guide

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Append Log waits

The number of times a task had to wait for the append log semaphore to be granted for the selected temporary database.

Use this as a measurement of the activity of the transaction log. Use this metric in conjunction with Append Log Requests to determine the contention on a transaction log. 

Some options for reducing log semaphore contention are:

Increasing the ULC size, if filling user log caches is a frequent cause of user log cache flushes.

Reducing log activity through transaction redesign. Aim for more batching with less frequent commits. Be sure to monitor lock contention as part of the transaction redesign.

Reducing the number of multi database transactions, since each change of database context requires a log write.

Dividing the temporary database into more than one database so that there are multiple logs. If you choose this solution, divide the temporary database in such a way that multi database transactions are minimized.  

* Available only on Adaptive Server versions 12.5.03 or later.


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