Difference between AQ$ TableName and TableName of the queue

Our BPEL process is listening for the event of Oracle ebiz business. Noted that

Arise-> Message available in wf_deferred (name of the queue table)-> Message available in wf_bpel_qtab (name of the queue table)-> BPEL called proceeding.

After the process described above, noted that State record wf_bpel_qtab is 0 and there is no value in waiting times. On the other hand, according to AQ$ WF_BPEL_QTAB, for the same message that the State is treated and dequeue time is met.

1. why there is difference of data AQ$ TableName and TableName queue
2. is there any process to ensure that data queued TableName and AQ$ TableName are synchronized
3. when the data will be deleted from the TableName queue? Currently, the retention of the queue value is 0.

Thank you.

Hello

In response:

* 1. Why there is difference of data AQ$ TableName and queue TableName. *
The queue_table_name of $ aq is a VIEW based on the QUEUE_TABLE and join other objects queue, you should not query the table of the queue directly because the values here are open to interpretation, until you link them with other available data, so why oracle creates the AQ$ views that you can use.

* 2. Is there any process to ensure that data queued TableName and AQ$ TableName are in sync *.
You do not need to "synchronize" a data views with its table, a view is simply a stored SQL statement so when selected you get the data from the table right now.

* 3. When the data will be deleted from the TableName queue? Currently, the retention of the queue value is 0.*
The PROCESSED data are removed by background qmon processes when all the messages in the initial queue have been processed, for example if you have multiple subscribers etc. must all were treated to be eligible for deletion, background qmon processes depend on the database parameter aq_tm_processes - the optimum setting for which is oracle version dependent.

I hope this helps.

Paul

Tags: Database

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