Re: Question about difference in performance of 2 queries

Here is the pg_stats data.  The explain analyze queries are still running.

select * from pg_stats where tablename = 'f_pageviews' and attname =
'date_key';
 schemaname |  tablename  | attname  | null_frac | avg_width |
n_distinct |             most_common_vals
|
most_common_freqs
|               histogram_bounds                | correlation

------------+-------------+----------+-----------+-----------+------------+-------------------------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------+-------------
 public     | f_pageviews | date_key |         0 |         4 |
60 | {335,307,309,336,308,321,314,342,322,316} |
{0.0283333,0.0243333,0.0243333,0.0243333,0.024,0.0233333,0.0226667,0.0226667,0.0223333,0.0216667}
| {304,311,318,325,329,334,341,346,351,356,363} |    0.345026
(1 row)

select * from pg_stats where tablename = 'f_pageviews' and attname =
'content_key';
 schemaname |  tablename  |   attname   | null_frac | avg_width |
n_distinct | most_common_vals |   most_common_freqs
|
histogram_bounds                                   | correlation

------------+-------------+-------------+-----------+-----------+------------+------------------+-----------------------+-------------------------------------------------------------------------------------+-------------
 public     | f_pageviews | content_key |         0 |         4 |
983 | {-1,1528483}     | {0.749333,0.00166667} |
{38966,323835,590676,717061,919148,1091875,1208244,1299702,1375366,1434079,1528910}
|    0.103399
(1 row)

Thanks.

--sean


Tom Lane wrote:

>Please show EXPLAIN ANALYZE output for your queries, not just EXPLAIN.
>Also it would be useful to see the pg_stats rows for the date_key and
>content_key columns.
>
>            regards, tom lane
>
>
>