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 11. Environmental settings that affect SQL performance 387
scan to build a Hash Table. The optimizer took some time to build the Hash Table. Once the
Hash table was ready it speeded up the query.
Figure 11-6 Sample of Visual Explain of the SQL statement with optimization goal ALL I/O and
Optimize for ALL rows clause
11.3 Sensitive Cursors
Cursor sensitivity controls whether or not the result set returned by a cursor will include
changes (Insert/Update/Delete) made to a table after the cursor was opened.
There are three types of settings for Sensitive Cursors
ASENSITIVE
– The Default setting. ASENSITIVE cursor allows DB2 to choose to implement ...
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