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Lock avoidance is a mechanism employed by DB2 for z/OS to access data without locking while maintaining data integrity. Avoiding locks can improve performance.
The DB2 DISPLAY command is a powerful tool that gathers details about your DB2 subsystems and databases. DBAs should know how to use DISPLAY to simplify their job.
A reminder about the VOLATILE keyword. It was added in DB2 Version 8 and can be specified on a table using CREATE TABLE and/or ALTER TABLE statements
Both DB2 for z/OS and DB2 for LUW support the INTERSECT and EXCEPT operations in SQL SELECT statements. They both are similar to UNION in the way in which they work and are coded. But there a differences.
Sometimes an application can require different, perhaps even somewhat "odd" data sorting. Often you can conjure up an answer by properly understanding the problem and applying some creative SQL.
In today's blog entry we will discuss the basics monitoring and DB2 performance monitors.
When designing DB2 databases a frequently heard request is for a column that contains sequentially generated numbers. For example, each row has a counter associated with it.
DB2 performance is one of those perennial topics that people just can't seem to get enough of. I guess that is because the performance of applications is one of the bigger issues that end users complain about
Want to go over DB2 SQL functions at a basic level? This is a review for those who might not have used them before.