The following bug has been logged online:

Bug reference:      5226
Logged by:          aftab
Email address:      akha...@hotmail.co.uk
PostgreSQL version: 8.3.8
Operating system:   Centos 5
Description:        Limit operator slows down
Details: 

S1="SELECT *
FROM position WHERE 
position.POSITION_STATE_ID=2 AND 
position.TARGET_ID=18
ORDER BY position.ID DESC 
";
S2="SELECT *
FROM position WHERE 
position.POSITION_STATE_ID=2 AND 
position.TARGET_ID=18
ORDER BY position.ID DESC 
LIMIT 1
";

S1 takes 0.16ms compared to S2 which takes 5 secs. Both S1 and S2 are same
except "LIMIT 1 " is added to S2.

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