Concurrent Processing

Be Warned: cmclean.sql Is Dangerous!

I’m sure one of the most popular scripts for Apps DBAs on My Oracle Support is cmclean.sql from MOS Article ID 134007.1 “Concurrent Processing – CMCLEAN.SQL – Non Destructive Script to Clean Concurrent Manager Tables”. DBAs usually use the script to clean up stale data from concurrent processing tables (FND_CONCURRENT_%) after incidents like a crash…

Performance Settings of Concurrent Managers

This is the second article in a series about internals and performance of concurrent managers. In this post, we’ll take a look at three important settings that affect the performance of the concurrent managers: number of processes, “sleep seconds”, and “cache size”. This article might be a bit on the theoretical side, but it should provide a good understanding of how these settings actually affect the behavior and performance of concurrent managers.