How To… Handle Caches in SAP XI 3.0 by SAP [pdf link to sap.com, requires s-user id] helps you understand where caches are used, how to update/clear caches and troubleshoot problems in SAP XI/PI 3.0

ABAP and Adapter Runtime Cache
SLD Cache
Repository Cache
CPACache

A very informative podcast, presentation, online e-class available from SAP, overview and demo by Andreas Stolz (blog entry by Uri Levy) titled Process Integration – Monitoring

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