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Can we use aggregate function like MAX in a cobol Db2 pgm?

 
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shchan

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Joined: 06 Jun 2007
Posts: 58
Location: Hyderabad

PostPosted: Fri Jan 28, 2011 9:08 am    Post subject: Can we use aggregate function like MAX in a cobol Db2 pgm?
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Hi,

Can anybody suggest on the usage of aggregate function like MAX in embedded sql or will these kind of sql statements effect the perfomance of DB2.
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dick scherrer

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Joined: 23 Nov 2006
Posts: 19270
Location: Inside the Matrix

PostPosted: Fri Jan 28, 2011 10:20 am    Post subject:
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Hello,

If you are trying to select the max value of some non-key field (say an amount) and there are 100 million rows in the table, returning the MAX amount will surely impact performance. . .

If you are trying to select the max value of another amount field in a different table that has only 10 rows, there will be no performance impact. . .

The more work you cause the system to do, the greater the performance impact.

As i occasionally mention, when testing some new process/functionality, full-volume testing should be done well before deployment. Processes that run very well with almost no data often are not executable in the "real world". . .
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