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Don Burleson Blog 







 aq_tm_processes Tips

Oracle Database Tips by Donald BurlesonMarch 14, 2015

Question:  How do I use the aq_tm_processes parameter in Oracle?  What purpose is aq_tm_processes?

Answer:  The aq_tm_processes parameter is used in advanced queuing applications (e.g. Oracle Streams) to control the time monitor on queued messages, and Oracle strongly recommends leaving aq_tm_processes alone and allow Oracle to auto-tune the processes.

There is a related wait event associated with this parameter "Streams AQ: qmn coordinator waiting for slave to start", but changing the default value can lead to extreme problems with advanced queuing, especially Oracle Streams.

When migrating to Oracle 10g and beyond, you have have a setting for aq_tm_processes, and you want to remove this parameter and this will enable Oracle to manage automatically how many processes will watch in your persistent and buffered queues.

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