Обсуждение: Date range for pg_stat_all_tables?

Ronit Allen wrote:
> I have the following query on pg_stat_all_tables to look at updates,
inserts, and deletes:
>
> SELECT relname, n_tup_ins, n_tup_upd, n_tup_del FROM
pg_stat_all_tables;
>
> How can I add a date range to the WHERE clause to show data from a
specified date range?
>
> I don't see anything in the table or in possible joins that will
provide dates.
>
> Thanks for any assistance that can be provided.

If you want that, you will have to take regular snapshots
of the table (e.g. with a cron job).
Then you can calculate differences.

Yours,
Laurenz Albe

Ronit Allen wrote:
> On 9.1 with postgresql.conf left at defaults, what period of time does
a query on pg_stat_all_tables
> cover?
>
> Let's say my database has been running for exactly one year.
>
> I then issue SELECT relname, n_tup_ins FROM pg_stat_all_tables;
>
> Do the results show me inserts for the last 7 days? 30 days? all
time?..

All time.

> I don't see the answer to this in
http://www.postgresql.org/docs/9.1/static/monitoring-stats.html (or
> maybe it is there and I am not understanding).

I don't see it documented there, except maybe by omission.

Yours,
Laurenz Albe