Oracle performance tuning case studies

Originally presented at an Oracle Tech Day in Dallas in A schizophrenic paper that covered two distinct topics. The first half of the presentation stuck to the original topic. The second half of the paper dealt with creative problem solving techniques relating to Oracle systems.

Oracle performance tuning case studies

This blog has been updated for MySQL 5. Many people are surprised because in most cases, we only suggest changing a few MySQL performance tuning settings after installation — even though hundreds of options are available. The goal of this post is to give you a list of some of the most critical settings.

We already made such suggestions in the past here on this blog a few years ago, but things have changed a lot in the MySQL world since then! Before we start… Even experienced people can make mistakes that can cause a lot of trouble. So before blindly applying the recommendations of this post, please keep in mind the following items: Change one setting at a time!

This is the only way to estimate if a change is beneficial. It is very handy and it allows you to quickly revert the change if it creates any problem. But in the end, you want the setting to be adjusted permanently in the configuration file.

A change in the configuration is not visible even after a MySQL restart? Did you use the correct configuration file? Did you put the setting in the right section? Do not allow duplicate settings in the configuration file.

If you want to keep track of the changes, use version control. If you do not, you are very likely to run into problems very quickly.

The buffer pool is where data and indexes are cached: The redo logs are used to make sure writes are fast and durable and also during crash recovery.

Up to MySQL 5. Fortunately crash recovery performance has improved a lot since MySQL 5. This has been lifted in MySQL 5. If you know your application is write-intensive and you are using MySQL 5. It is very frequent that because the application does not close connections to the database correctly, you need much more than the default connections.

Using a connection pool at the application level or a thread pool at the MySQL level can help here. Having a file per table allows you to reclaim space when dropping, truncating or rebuilding a table. It is also needed for some advanced features such as compression.

However it does not provide any performance benefit. For previous versions, you should set it to ON prior to loading data as it has an effect on newly created tables only.

It is the best value when your primary concern is data safety, for instance on a master. However it can have a significant overhead on systems with slow disks because of the extra fsyncs that are needed to flush each change to the redo logs.Oracle Performance Tuning In these post I’ll try to explain the performance troubleshooting approach by describing the case studies that I came across, how I approached them and then how gradually how the approach became a strategy, a generic strategy, that now I .

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Oracle performance tuning case studies

Oracle Database 11 g Release 2 () Steps in The Oracle Performance Improvement Method; Accessing SQL Test Case Builder from Enterprise Manager;. Title Description Date; Oracle Identity Management (OIM) Tech Day: Presentation on using the Oracle LDAP server (OID) for user authentication with 3 cases studies.

White Papers. What's New in MySQL ; MySQL Enterprise Edition Product Guide; What’s New in MySQL ; A Guide for SaaS Vendors: Gaining Competitive Advantage with MySQL. 1. STARBUCKS RMAN PERFORMANCE TUNING CASE STUDY. Starbuck’s current Enterprise Data Warehouse (EDW) has been in production since mid There has.

Technology Lead, Oracle CX. Abhinav is a tech-enthusiast with the ability to identify issues, obstacles, and opportunities, and then develop and implement effective solutions.

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