Обсуждение: Autovacuum working / not working ?
Hi All
I hope that someone can perhaps assist me with some insight into the autovacuum as well.
I have a couple of Postgresql databases at a client site.
The autovacuum is enabled, however when I run the sql query below it does not return any results:
Query:
select relname, last_vacuum, last_analyze,last_autovacuum,last_autoanalyze
from pg_stat_all_tables
where schemaname = 'public';
results:
postgres-# where schemaname = 'public';
relname | last_vacuum | last_analyze | last_autovacuum | last_autoanalyze
---------+-------------+--------------+-----------------+------------------
(0 rows)
They are running a combination of postgresql 8.1 and 8.3 over a couple of servers.
The current settings for the autovacuum are as follows:
autovacuum | on | Starts the autovacuum subprocess.
autovacuum_analyze_scale_factor | 0.1 | Number of tuple inserts, updates or deletes prior to analyze as a fraction of reltuples.
autovacuum_analyze_threshold | 50 | Minimum number of tuple inserts, updates or deletes prior to analyze.
autovacuum_freeze_max_age | 200000000 | Age at which to autovacuum a table to prevent transaction ID wraparound.
autovacuum_max_workers | 3 | Sets the maximum number of simultaneously running autovacuum worker processes.
autovacuum_naptime | 1min | Time to sleep between autovacuum runs.
autovacuum_vacuum_cost_delay | 20ms | Vacuum cost delay in milliseconds, for autovacuum.
autovacuum_vacuum_cost_limit | -1 | Vacuum cost amount available before napping, for autovacuum.
autovacuum_vacuum_scale_factor | 0.2 | Number of tuple updates or deletes prior to vacuum as a fraction of reltuples.
autovacuum_vacuum_threshold | 50
Your assistance will be appreciated.
Machiel Richards
MySQL DBA
Relational Database Consulting
