Is there an equivalent for Oracle's user_tables.num_rows

All,

    I am looking to automate analyze table in my application.

 

I have some insert only tables in my application which I need to analyze as data grows.

Since the inserts are application controlled, I can choose to run analyze when I determine the

data has grown more than x% since last analyze.

 

However since users can truncate the tables too, I need to be able to tell the numbers of rows

in the table as perceived by the optimizer.

 

I could not decipher a good way of telling the number of table rows from pg_stats/pg_statistics.

 

Does someone know of a way of telling what the optimizer believes the number of rows are ?

 

The tables in question have multi-column primary keys.

 

Regards,

 

Virag