In Part 1, I talked about some of the first steps that a developer should go through when it comes to tuning queries. In this article, I will go through the initial steps in evaluating a SQL query using the Db2 explain output.
When it comes to tuning a query, program, or even an application that most developers are not sure where to begin or what may be causing response time issue(s). This article is here to help!
A database lock is a mechanism utilized by Db2 to govern the access to a database object amongst different transactions. This article describes the locking mechanism for Db2 (for LUW).
Steve Thomas of CA Technologies presents a great introduction into the world of locks, latches, claims and drains. A must see for all developers working wit Db2 for z/OS as well as all DBAs wanting to refresh their knowledge.
There are a number of fairly important tuning tips that do not get much attention. In this article I will describe one of my favorites – Hash Joins.