March 2007
Intermediate to advanced
488 pages
13h 46m
English
book
OnDemand SQL Performance Analysis Simplified on DB2 for i5/OS in V5R4
by Hernando Bedoya, Jaime Gaug, James Kerl, Ser Ser NG, Jose Cardoso dos Santos
Content preview from OnDemand SQL Performance Analysis Simplified on DB2 for i5/OS in V5R4
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Chapter 2. DB2 for i5/OS performance basics 17
2.2.1 Database architecture before V5R2M0
For systems prior to the release of V5R2M0, all database requests are handled by the CQE.
Figure 2-3 shows a high-level overview of the architecture of DB2 for i5/OS before OS/400
V5R2. The optimizer and database engine are implemented at different layers of the
operating system.
Figure 2-3 Database architecture before the release of V5R2M0: Classic Query Engine
Most CQE query decisions are made above the machine interface (MI) level. In CQE, the
interaction between the optimizer and the query execution component occurs across the MI,
resulting in interf
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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.