March 2004
Intermediate to advanced
356 pages
8h 11m
English
book
WebSphere Portal Server and DB2 Information Integrator: A Synergistic Solution
by Nagraj Alur, Isaac Allotey-Pappoe, Chris Delgado, Jayanthi Krishnamurthy, Walter Alvey
Content preview from WebSphere Portal Server and DB2 Information Integrator: A Synergistic Solution
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Chapter 3. DB2 Information Integration architecture overview 59
Nickname column options for best performance
The NUMERIC_STRING and VARCHAR_NO_TRAILING_BLANKS and
nickname column options impact the decisions made by the DB2 optimizer and
thereby query performance:
NUMERIC_STRING
This nickname column option applies to character data types and is
applicable to those data sources for which the COLLATING_SEQUENCE
server option is set to N.
The federated system does
not push down any operations that can produce
different results due to differences in collating sequences between the
federated database and the remote data source. Suppose that a d ...
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