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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How to Use the SYSSTAT Tables to Perform What-if Modeling and Analysis
Because DB2 maintains the SYSIBM and SYSCAT system catalog tables and views, they are read-only. However, you can update the SYSSTAT views. This is a special set of views that you can use to update database statistics. The information contained in these views affects how the DB2 optimizer chooses access plans when executing a query.
For planning purposes, you can change the statistical information in the SYSSTAT tables so that they do not reflect the actual state of tables and indexes. This lets you:
Model query performance on a development system using production system statistics.
Perform what-if query performance analysis by examining various possible changes to the query ...
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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.