Here's the situation:
relation_size | indexes_size | total_relation_size
----------------+----------------+---------------------
997 MB | 2073 MB | 3070 MB
(1 row)
If I select n_dead_tup from pg_stat_user_tables, I get:
n_dead_tup
------------
0
Okay, so I run ANALYZE table, then check again:
n_dead_tup
------------
0
Finally, I run VACUUM FULL ANALYZE table. Now I see:
relation_size | indexes_size | total_relation_size
----------------+----------------+---------------------
118 MB | 200 MB | 319 MB
(1 row)
.... ?
It seems clear that there were dead tuples, since the table size shrank to
an eighth of its previous size. Why did analyze not pick that up?
Am I missing something?
This is a very large database, so we want to introspect against live/dead
tuple percentage to minimize the tables we run a VACUUM FULL against.
I've been staring at this for days.
-john
--
John Melesky | Sr Database Administrator
503.284.7581 x204 | john.mele...@rentrak.com <vincent....@rentrakmail.com>
RENTRAK | www.rentrak.com | NASDAQ: RENT
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