"A.Bhuvaneswaran" <bhuvan(at)symonds(dot)net> writes:
> I have a table and an index on it. The index is used when i use '=3D'
> operator for the indexed field in the where condition. But the index is
> not used when i use '>=3D' operator for the same field.
Unsurprising. An inequality condition may require fetching many rows
(the planner is estimating 336289 rows here...) and so an indexscan is
not necessarily quicker. Have you compared actual runtimes with
enable_seqscan on and off?
regards, tom lane