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From "Alex Boisvert (JIRA)" <j...@apache.org>
Subject [jira] Created: (ODE-444) Improve performance of InstanceManagement
Date Tue, 02 Dec 2008 00:09:44 GMT
Improve performance of InstanceManagement
-----------------------------------------

                 Key: ODE-444
                 URL: https://issues.apache.org/jira/browse/ODE-444
             Project: ODE
          Issue Type: Task
          Components: Management Console
            Reporter: Alex Boisvert
             Fix For: 1.3


There are some performance issues with the current InstanceManagement.listXXXInstances() operations,
notably:

1) listAllInstances() is quite dangerous -- it will run into OutOfMemoryException if you have
lots of instances
2) listAllInstancesWithLimit() is better but suffers performance-wise because it attempts
to load the instance summary data, the events, the scopes and properties of the matching instances.
 This result is too much database activity for the common case, moreover the current implementation
is horrific because it actually performs 4 joins for each instance!

So I'm introducing listInstancesSummary(String filter, String order, int limit) that only
loads the instance summary and the properties in only 3 joins (total, not per instance) to
address these performance issues and making both listAllInstances() and listAllInstancesWithLimit()
use this method under the cover.

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