DB2 Collects Table statistics in an automated way. This post tells you how Optimizer uses the Statistics for a better SQL query execution plan.
In DB2, you can avoid unnecessary locking by following these Technics. These improve application performance.
Indexes improve the performance of the database tables. However, this post covers differences between clustered index and unique index.
QUIZ on DB2 useful for interviews and projects.
In this post you can find how to Create and Delete DB2 user-defined functions.
Three top SQL queries you need to get Table metadata. Metadata means Table structure. That means to know indexes and columns of a Table in question.