January 2005
Beginner to intermediate
928 pages
22h 14m
English
book
Understanding DB2®: Learning Visually with Examples
by Raul F. Chong, Clara Liu, Sylvia F. Qi, Dwaine R. Snow
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16.6. Lack of Proper Maintenance
There are two important database maintenance operations that you need to perform on a regular basis.
Reorganize your tables and indexes as they become unclustered due to INSERT, UPDATE, and DELETE statements.
Keep the statistics on your tables and indexes current, especially as you add, change, or remove data from your tables.
The DB2 optimizer uses the statistics about your tables and indexes when it is building the access plan for the statements executed by your applications. If the statistics are out of date or show that the data is not clustered according to the indexes you have defined on the tables, the optimizer cannot choose the most efficient access plan.
Statistics about your database objects are stored ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.