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Oracle Advanced Queuing tips

Oracle Database Tips by Donald BurlesonJune 15, 2015


Advanced Queuing (AQ) is Oracle's implementation of a messaging system which can be used as a replacement for the dbms_pipe package and other bespoke solutions.  The basic unit of the Oracle Advanced Queuing messaging system is a message with the most important element of the message being its contents, or payload. 

The payload of the advanced queuing message can be as simple or complicated as desired.  In this case, the only concern is that the message has been sent.  The particular contents are not important at this time, so the message is extremely simple.

Administration of queues within Oracle Advanced Queuing is done using the dbms_aqadm package and requires the aq_administrator_role to be granted to the administrator.  Alternatively, all administration can be performed by a privileged user such as SYS or SYSTEM.  With the payload object defined, the queue table is created using the create_queue_table procedure.

Once the queue table has been created, the individual queues are created and started using the create_queue and start_queue procedures respectively.  A single queue table can hold many queues as long as each queue uses the same type for its payload.

Messages are queued and de-queued within Oracle Advanced Queuing using the dbms_aq package.  Access to this package can be granted using the aq_user_role role. However, access to it from a stored procedure is achieved by using the job_chain_aq_setup.sql script, which grants the privilege on this object directly to the test user.

See these related notes on Oracle advanced Queuing:



 

 

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