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sql differences

edited Mar 26, 2014 12:00PM in SQL Performance (MOSC) 3 commentsAnswered

i have a query that executes fast in one database and takes long time to execute in another..i have attached execution plan as good and bad plan

things i noticed are

1.In good plan parallel execution is used

2.PS0CA_CONSTR_HDR doing  a fast full scan  in good plan where as in bad plan it chooses range scan

3.There are no major object differences but i can see in bad plan  additional index are used instaed of full scan in good plan.(both the databases has the same set of indexes)

when i change the indexes in bad plan to invisible parallel is used but still the execution is slow.

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