generating statistics

Hi,

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.

I am trying to get a list of all used indices and referenced tables in the
database for a particular run. According to the doc. the following tables
should contain this information: pg_stat_user_indexes, pg_stat_all_tables.
But, these tables are not getting populated. Do I need to set something else
to be able to get this information??

Regards,
Vinita Bansal

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