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| Topic names in PubSub |
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| tleichen |
 Posted: Wed Jun 20, 2007 7:29 am Post subject: Topic names in PubSub |
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Yatiri
Joined: 11 Apr 2005
Posts: 663
Location: Center of the USA
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How long can a publish/subscribe topic name be? I have not been able to find a specified maximum length. I'm using Websphere MQ version 5.3. 
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| jefflowrey |
| Posted: Wed Jun 20, 2007 8:26 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Base MQ Pub/Sub uses an MQRFH header, not an MQRFH2 header, I believe.
That means that your Topic name can be no longer than can fit in to the NameValueString field on the MQRFH.
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| tleichen |
| Posted: Wed Jun 20, 2007 11:02 am Post subject: |
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Yatiri
Joined: 11 Apr 2005
Posts: 663
Location: Center of the USA
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But, according to the Programming Reference, this is a variable length field, which is given by the NameValueLength field. That would only imply a maximum length of the maximum value for an MQLONG! 
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| jefflowrey |
| Posted: Wed Jun 20, 2007 11:56 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Well, and?
It certainly has to be shorter than 100MBs - sizeof(MQMD) - sizeof(MQRFH fixed fields).
It pretty certainly has to be no longer than a PCF String field, given that there's an equivalent PCF message to the MQRFH message for all the base pub/sub commands.
I remember something that may have said that it can't be any longer than a Namelist - which is like 255. But I don't remember where or when...
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