August 2012
Intermediate to advanced
452 pages
15h 41m
English
book
Optimizing DB2 Queries with IBM DB2 Analytics Accelerator for z/OS
by Paolo Bruni, Patric Becker, Willie Favero, Ravikumar Kalyanasundaram, Andrew Keenan, Steffen Knoll, Nin Lei, Cristian Molaro, P S Prem
Content preview from Optimizing DB2 Queries with IBM DB2 Analytics Accelerator for z/OS
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Chapter 1. Data warehousing on System z 15
DB2 10 allows you to define additional non-key columns in a unique index. You do not
need the extra five-column index and the processing cost of maintaining that index. DB2 in
NFM includes a new INCLUDE clause on the CREATE INDEX and ALTER INDEX
statements.The INCLUDE clause is only valid for UNIQUE indexes. The extra columns
specified in the INCLUDE clause do not participate in the uniqueness constraint.
Index updates use of I/O parallelism
DB2 10 provides the ability to insert into multiple indexes that are defined on the same
table in parallel. Index insert I/O parallelism manages concurrent I/O requests on different
indexes into the buffer pool in parallel, with the intent of overlapping the synchronou ...
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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.