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MQSeries.net Forum Index » General IBM MQ Support » Compression

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solomon_13000
PostPosted: Mon Aug 18, 2008 6:21 am    Post subject: Compression Reply with quote

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Joined: 13 Jun 2008
Posts: 284
From my reading I found that there are two types of compression. The first is known as the application compression and the other is known as the MQ compression. Which is better?. Also according to the article compression can help to improve channel performance and reduce network traffic. From my point of view segmentation is less favourable when compared to compression. Any opinion?. Also in the context of MQ compression we can choose to do a header or data compression. Is both preferable?.
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fjb_saper
PostPosted: Mon Aug 18, 2008 1:21 pm    Post subject: Re: Compression Reply with quote

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
solomon_13000 wrote:
From my reading I found that there are two types of compression. The first is known as the application compression and the other is known as the MQ compression. Which is better?. Also according to the article compression can help to improve channel performance and reduce network traffic. From my point of view segmentation is less favourable when compared to compression. Any opinion?. Also in the context of MQ compression we can choose to do a header or data compression. Is both preferable?.

Compressing headers will make things extremely difficult if you need to inspect data on the wire... Data compression is usually sufficient.
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gbaddeley
PostPosted: Mon Aug 18, 2008 7:07 pm    Post subject: Reply with quote

Jedi Knight

Joined: 25 Mar 2003
Posts: 2538
Location: Melbourne, Australia
Application Compression that is done in the application program before putting the message into MQ can achieve better compression than MQ's channel compression because it can be taylored to the type of data being handled, resulting in smaller messages than what MQ can do. However, this adds extra code to be maintained at both the sending and receiving apps. It may also make MQ message conversion impossible if its being transported between different platform types. The recommendation is to keep programs as simple as possible and let MQ do compression as part of its channel transport.

Header compression will result in smaller packets across the network, but unless the network capacity is very close to 100%, it probably won't make much difference to end-to-end performance.
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