Purging queues in Oracle 8i

Hi,
I've got an old Oracle 8i (8.1.7.3.0) database that has some queues that have been running for years with retention_time=-1 so there are gigabytes of old messages taking up approx 200GB of disk space. Here's an example of how one of the queues looks:
BEGIN DBMS_AQADM.CREATE_QUEUE(
Queue_name => 'ABC.MY_Q',
Queue_table => 'ABC.MY_Q_TAB',
Queue_type => 0,
Max_retries => 5,
Retry_delay => 0,
Retention_time => -1,
dependency_tracking => FALSE,
comment => 'My Queue);
END;
My question is how best to remove the old messages ? I'm quite happy to start afresh with zero messages in the queue tables. From the research I've done I've come up with these possibilities:
1. Allter the queues to have a sensible retention time e.g.
DBMS_AQADM.ALTER_QUEUE(
Queue_name => 'ABC.MY_Q',
Retention_time => 60 * 60 * 24 * 7);
Question - will this automatically cause all older messages to be removed ? If yes, is it a slow operation for hundreds of millions of messages and does it require lots of undo tablespace ? If no, then what other steps are required to purge the data older than the new retention time ?
2. Stop, drop, recreate and start the queues.
Question - will this also be a slow operation for hundreds of millions of messages and does it require lots of undo tablespace ?
3. Truncate the queue tables.
Question - is this safe ? Will behind the scenes objects get screwed up ? Perhaps after truncating the tables I should drop and recreate the queues and queue tables ?
Thanks in advance for your help,
Colm
Edited by: 802408 on 14-Oct-2010 08:52

As i see it your only option is to drop and recreate, I'm assuming you don't want any of the messages that are held? If not then stop, drop and recreate with a sensible retention time.
If you allow oracle to remove the messages you will still be left with a huge queue table as it will not reclaim the space.
The drop operation should be quick and will not cause undo problems - assuming you don't want to try and keep any of the messages to put back on to the recreated queue.
Do not manually truncate the queue tables - this is not supported and not recommended, if you are happy to do this then the best approach is to drop and recreate.
Thanks
Paul
Edited by: PaulTill2508 on Oct 16, 2010 12:05 PM

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