Database Blog

Five Leading Causes of Oracle Database Performance Problems

As we evaluate our clients’ Oracle databases and help them solve problems relating to performance and stability, we see many causes for these issues. However, there are a small number of basic issues that tend to cause problems on the majority of systems. Our Tech Tips document describes these issues and discusses methods of identifying them and resolving … Continue reading Five Leading Causes of Oracle Database Performance Problems

Remove that Clutter: The Annual Database Security Audit and Cleanup

As the New Year begins, many of us take the beginning of a new calendar year as a cue to to clean out and shred our old files and reorganize our storage spaces so that we have room for all the new supplies and equipment we will need in the new year. We do this … Continue reading Remove that Clutter: The Annual Database Security Audit and Cleanup

Oracle RAC is Now Supported on VMware

In a recent change to its long-standing policy, Oracle Corp. will now support its customers running Oracle Real Application Cluster (RAC) software on VMware platforms in certain circumstances. This positive move for customers was announced in a document titled “Support Position for Oracle Products Running on VMware Virtualized Environments,” which Oracle posted on its support … Continue reading Oracle RAC is Now Supported on VMware

Oracle Performance Tuning — Trust but Verify

During an Oracle Performance Tuning engagement in the past, I learned a valuable lesson about validating the information that you are given during a database evaluation. About ten years ago, a client called me with a serious problem. They had just completed development on a new Oracle application at a large pharmaceutical company and the … Continue reading Oracle Performance Tuning — Trust but Verify

Oracle Performance Tuning: Periodically reorganize database objects

One of our Oracle Consultants shared a story with me today that illustrates the importance of periodically reorganizing objects in an oracle database. He was examining a performance problem with a very small oracle table. The table had only 154 rows!. Hardly a large table, and yet it was taking over a minute to do … Continue reading Oracle Performance Tuning: Periodically reorganize database objects

Oracle Security — Data Masking using Enterprise Manager

Database administrators often have to provide test data sets to developers, QA teams, or UAT teams. This can be done manually creating test data sets, which can take a very long time especially when the goal is to stress test a new system and a large amount of data is required. An alternative approach often taken by … Continue reading Oracle Security — Data Masking using Enterprise Manager

The importance of documentation, organization, and cross-training

A recent experience on a large database development project illustrates three very important principals to follow when developing a large computer system;  keeping code well organized, keeping code well documented, and ensuring that more than one person is familiar with all portions of the code base. After about four months of development the lead developer … Continue reading The importance of documentation, organization, and cross-training

Oracle Performance Tuning — Log Sync Waits

I recently worked with a client to resolve a significant performance issue related to painfully slow queries in an Oracle database. One of the queries that they wished to execute was taking over five hours to run. This is an Oracle 10g database running on a Solaris platform. The server has 8 processors so there … Continue reading Oracle Performance Tuning — Log Sync Waits

Five reasons why I avoid database query hints

I know that some will disagree with me on this but I have never been a fan of query hints.

Most database vendors give you the ability to override the query optimizer with hints that you specify in a query. Each query can be executed in a variety of ways by the…

Five reasons why I avoid database query hints

I know that some will disagree with me on this but I have never been a fan of database query hints. Most database vendors give you the ability to override the query optimizer with hints that you specify in a query. Each query can be executed in a variety of ways by the database engine. … Continue reading Five reasons why I avoid database query hints