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Database Tuning (MOSC)

SQL tuning fixated on restructure

Jul 23, 2021 8:03PM in Database Tuning (MOSC) 9 commentsAnswered

Hi,

have a query that sometimes pick a bad plan when value has high cardinality.

have run the tuning advisor but it only recommends a restructure when the issue is elsewhere.

version 12.2

query is

where column = <value> #this is the value that influences the plan

and Decode(blah)=decode(blah). # this is the part oracle recommends restructuring

why does the tuning advisor not get to the issue?

thanks

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