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From: Paul Clarke <[EMAIL PROTECTED]> Reply-To: MQSeries List <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] Subject: Re: MQ software evolution - fill in the gaps? Date: Fri, 13 Jun 2003 13:36:21 +0100
After my last append I have had a number of private queries asking things like "wasn't MQ based on TCAM" etc. So I went to the horses mouth as it were and spoke to one of the senior developers on the WMQ z/OS product who's been working on MQ even longer than I have. This was his response.....
"I'm sorry to spoil anyone's ideas of the history of the 390 Queue Manager but I think it is worth clarifying the real origins of the product. Some of the initial infrastructure code and functional resource managers were taken from DB2 . The initial development team reused a number of the DB2 resource managers for which a database and queue manager have similar requirements. For example , a Recovery Manager, a Log Manager , a Storage manger , Command Handling/ Parsing , Utilities etc. This is why at a first glance the casual observer might confuse a DB2mstr address space with a WMQmstr address space. We also used the Data Space Control Facility (DSCF) services of DB2 , to provide a framework in which it was easy/easier to add queueing specific resource managers to a Queue Manager product. But he most important point to note is that all of the Queueing specific resource managers were written at Hursley, for example the Message Manager , the Data Manager , the Buffer Manager , the Lock Manager and the Security Manager to name but a few. Many of these components had to be written from scratch due to the fundamental differences in read/write profiles of users of databases and the users of queues. Paul Kettley MQ/MQSeries/WMQ developer 1991-2003""
So.....let's hear no more about TCAM or EzBridge eh ?
Cheers, P.
Paul G Clarke WebSphere MQ Development IBM Hursley
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