"vinita bansal" <[EMAIL PROTECTED]> writes:
> I have set the following variables in postgresql.conf to true: 
> stats_start_collector,stats_command_string, stats_row_level, 
> stats_reset_on_server_start.

Is the statistics collector actually starting?  Look in "ps auxww"
output to see if the postmaster has a pair of child processes that claim
to be the stats collector and stats buffer processes.

If not, the postmaster log should have some info about the problem.

                        regards, tom lane

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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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