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Container-Local transaction optimization?

 
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I seem to be finding this term often, "Local Transaction Optimization".
Can somebody explain this to me please.
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The container may use a local transaction optimization for enterprise beans whose deployment descriptor indicates that connections to a resource manager are shareable.
Suppose an application acccess the same resource at several points in an transaction, it is possible to use the same connection to the resource rather than different connection since these connection refer to the sam resource provided that connections to a resource manager are shareable.
 
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