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As part of our regular commitment to reviewing RFEs, we have re-reviewed this RFE. We note that the architecture does allow you to idle out the connections and return them to the thread pool, but we agree that it would be helpful to allow an administrator to specify an exact desired number of threads for each connection, and to help display this by informing users of the linkage to which flows are using which database ODBC connections. We will continue to monitor this RFE. For now its status is maintained as Uncommitted Candidate.
Due to processing by IBM, this request was reassigned to have the following updated attributes:
Brand - WebSphere
Product family - Integration
Product - IBM Integration Bus (WebSphere Message Broker) - IIB
For recording keeping, the previous attributes were:
Brand - WebSphere
Product family - Connectivity and Integration
Product - IBM Integration Bus (WebSphere Message Broker) - IIB
The situation is far more serious than described here, and there is more than ODBC-JDBC compatibility or max connection at stake. Currently, the state of affairs is as follows, to quote IBM: "the default behaviour of an ODBC connection used by an additional instance is to close as soon as that instance returns to the thread pool. That means the connection will close whenever the additional instance has no work to do. The connection can be configured to persist until the flow terminates."
Further info:
http://publib.boulder.ibm.com/infocenter/wmbhelp/v7r0m0/index.jsp?topic=%2Fcom.ibm.etools.mft.doc%2Fac00406_.htm
http://www-01.ibm.com/support/docview.wss?uid=swg21610149
This means either maxing out on connections if they persist, or a continuous (and truly unnecessary) opening and closing of connections on a normal production system. We've monitored our databases and this is indeed the case - Our broker closes opens a new connection about three times per second. The repercussions for performance and scalability are obvious.
IMO, this feature is a must.
Thanks for raising this requirement. We have a strategic desire to reach functional equivalence between ODBC and JDBC, and adding ODBC connection pooling is consistent with that aim. We'll investigate adding connection pooling for a follow-on release or fixpack.
The context here is to enable highly scalable connection management for Message Broker flows that need to connect directly to an ODBC database. Current functionality can mean that max database connections are quickly exhausted.