[PERFORM] Help understanding stat tables

[Chris Hoover]

I just want to make sure that I am interpreting this data correctly.

From pg_statio_user_tables, I have pulled relname, heap_blks_read, 
heap_blks_hit.  I get several rows like this:
relname                         heap_bkls_read  heap_blks_hit
 clmhdr                         8607161                 196547165                      
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                               


So this means that I am getting over a 100% cache hit ratio for this table, 
right?  If not, please help me understand what these numbers mean.

Thanks,

Chris


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