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Our developers have finally started using ALTER TABLE instead of rename/copy method of changing files. One of the things we noticed is that there are times that there are significant differences in the performance of the change.
We've already suggested to them that instead of multiple passes with only one change at a time, they should be doing all the changes in a single pass. We've also noted where the differences can be accounted for by files with many/few columns and by files with many/few rows.
After taking the above into consideration we're still finding that the ALTER TABLE give very inconsistent results. For example, for a given file which had 0 records, in library A it took 5 seconds to finish while in library B (also 0 records) it to 22 seconds to finish.
FWIW, we're at V6R1 on Power7.
So, has anyone got suggestions at what we can look at or do to improve our performance?
Thanks,
Kat Kruse
Qualcomm, Inc.
Systems Support Engineer
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