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MQSeries.net Forum Index » General IBM MQ Support » Where does MQ store messages?

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rxm8778
PostPosted: Tue May 20, 2008 10:46 am    Post subject: Where does MQ store messages? Reply with quote

Apprentice

Joined: 15 Sep 2005
Posts: 37
I know this must have been discussed a few times in this forum but after I read more than a few threads on this I got a little confused... So here is hopefully my simple question:

On a UNIX queue manager with a bunch of queues (let's say 100 queues) which are all full holding non persistent messages, where are those messages stored physically?
in memory? or on disk (filesystem)?

Now if all these queues are full with persistent messages where are those messages stored?
in memory? or on disk (filesystem)?

thanks

Last edited by rxm8778 on Tue May 20, 2008 8:16 pm; edited 2 times in total
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gbaddeley
PostPosted: Tue May 20, 2008 6:25 pm    Post subject: Reply with quote

Jedi Knight

Joined: 25 Mar 2003
Posts: 2538
Location: Melbourne, Australia
Both. In memory for performance and disk for reliability. Persistent messages are hardened to disk ASAP.
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rxm8778
PostPosted: Tue May 20, 2008 8:13 pm    Post subject: Reply with quote

Apprentice

Joined: 15 Sep 2005
Posts: 37
gbaddeley wrote:
Both. In memory for performance and disk for reliability. Persistent messages are hardened to disk ASAP.


Don't mean to be difficult but I am not sure which one of my questions you have answered when you said both...

Are you saying that regardless of the type of message persistent or non persistent they saved in both memory and and disk. But Persistent messages are written to disk ASAP But for non persistent message there is a delay before they are written????
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rxm8778
PostPosted: Tue May 20, 2008 10:47 pm    Post subject: Reply with quote

Apprentice

Joined: 15 Sep 2005
Posts: 37
I just had to search this forum some more...and EUREKA!

I found the following interesting link... this should give me some starting thoughts...

http://www.mqseries.net/phpBB2/viewtopic.php?t=23858
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