Are access plans and "timerons" comparable from one DB2 Server to another or are they dependent on the server they are run on. I am trying to compare access plans for the same piece of sql code run on two different servers each containing a copy of the same database and data. sane environment different physical servers.
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Timerons - are the comparable across servers ?
- Thread starter JFK40
- Start date
Timerons are pretty much useless imho. If you want to performance a piece of sql, do this:-
1. Do a "runstats" on all the tables in the sql.
2. Run dynamic explain and look for:-
a) Table scans
b) Nested loop joins to tables with a lot of rows in them
c) Inefficient indexes e.g. where it's only using 1 of the index columns.
3. Once you've appropriately indexed the sql, if it's still a problem then start splitting down the sql and actually running each bit to find which section is causing you problems.
1. Do a "runstats" on all the tables in the sql.
2. Run dynamic explain and look for:-
a) Table scans
b) Nested loop joins to tables with a lot of rows in them
c) Inefficient indexes e.g. where it's only using 1 of the index columns.
3. Once you've appropriately indexed the sql, if it's still a problem then start splitting down the sql and actually running each bit to find which section is causing you problems.
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