Author: Maris Elsins

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…

This is a short blog post on how one can prove that a particular partition of the table or index is accessed by a specific query.

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.

This is the first article in a series about performance of concurrent processing. We’ll take a closer look at the internals of concurrent managers, the settings that affect their performance and the ways of diagnosing performance and configuration issues. Today we’ll start with an overview of the internal workflow of a concurrent manager process. Enjoy the reading!

As we all know proper use of bind variables in SQL statements is a must to make transaction processing applications scalable. So how do we find the queries that don’t use bind variables and have to be parsed each time they are executed? There is number of ways, but this article is all about the most effective way I know. If you have a better one – let me know please!

I attended a great presentation at UKOUG 2011, “Oracle E-business Suite’s use of edition-based redefinition for online patching,” delivered by Bryn Llewellyn from Oracle. The presentation provided thorough insight on how EBR works and how E-Business Suite will be able to use it for online patching. It answered many questions, but raised a few more questions and concerns. I’ll try to summarize in this post the main concerns I’ve been thinking about after attending this presentation.

Another December has started and you know what it means right? It’s the Christmas time? NO! It’s time for UKOUG Technology and e-Business Suite 2011 conference! There are not many things that can make a passionate Apps DBA more excited than that. UKOUG Tech & eBS conferences are the only ones in Europe that have such a rich content for Application DBAs and this year it will not be different.

A few days ago I was asked to estimate how much space needed to be added to the ASM diskgroup to handle the database growth for one year without additional need of adding disks. To do this I needed to calculate acceleration and assuming the acceleration stays the same I would be able to calculate the “distance” or (how much the DB would grow in one year). I used the following formulas…