Rajesh Kumar Mallah wrote:
> Hi,
> NOT EXISTS is taking almost double time than NOT IN .
> I know IN has been optimised in 7.4 but is anything 
> wrong with the NOT EXISTS?
> I have vaccumed , analyze and run the query many times
> still not in is faster than exists :>

Seems fine.  In 7.4, NOT IN will often be faster that NOT EXISTS.  NOT
EXISTS didn't change --- there are restrictions on how far we can
optimize NOT EXISTS.  NOT IN has just become much faster in 7.4.

  Bruce Momjian                        |  http://candle.pha.pa.us
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TIP 9: the planner will ignore your desire to choose an index scan if your
      joining column's datatypes do not match

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