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Can I see rewritten SQL? Can I see rewritten SQL?

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Old 02-27-2008, 02:30 AM
ford_desperado@yahoo.com
 
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Default Can I see rewritten SQL?
I take it the optimizer rewrites my queries.
Can i see the rewritten ones?

DB2 UDB v8.1

TIA

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  #2 (permalink)  
Old 02-27-2008, 02:30 AM
spencer@tabbert.net
 
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Default Re: Can I see rewritten SQL?
Run it through an explain plan and you will see the rewritten SQL.
Spencer

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  #3 (permalink)  
Old 02-27-2008, 02:30 AM
Serge Rielau
 
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Default Re: Can I see rewritten SQL?
ford_desperado@yahoo.com wrote:
> I take it the optimizer rewrites my queries.
> Can i see the rewritten ones?
>
> DB2 UDB v8.1
>
> TIA
>
cd to sqllib/misc
connect to your database
db2 -tvf EXPLAIN.DDL
db2 explain plan for <query>
db2exfmt -d <dbname>
<accept all default except when asks you for a filename>

The rewritten query is at the top. Note that DB2 does it's best, but is
not guranteed to produce the SQL since the internal model is more
general than SQL. Not always can the query be reverse engineered into
SQL Text.

Cheers
Serge
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