只读副本的真空统计

Question

We have a hot_standby replication configured for our postgresDB, master is for read/write and replica is a read only server.

When I try to fetch the dead tuple count on both master and replica (slave) using the following query

#########vacuum and analyze stats
SELECT relname,last_autovacuum,last_autoanalyze,autovacuum_count,autoanalyze_count FROM pg_stat_user_tables;
#########vacuum and analyze stats

I got the below data on slave server

MyTestDB=# SELECT relname,last_autovacuum,last_autoanalyze,autovacuum_count,autoanalyze_count FROM pg_stat_user_tables;
              relname              | last_autovacuum | last_autoanalyze | autovacuum_count | autoanalyze_count
-----------------------------------+-----------------+------------------+------------------+-------------------
Table1                             |                  |                  |                0 |                 0
Table2                             |                  |                  |                0 |                 0

Here the question is, does analyze/vacuum applicable for slave server? if so, it should contain some stats like last autovacuum_count, autoanalyze_count?

Note: As per this thread in postgres forum VACUUM and ANALYZE are automatically replicated into slave

Answer 1

VACUUM and ANALYZE won't run on standby servers (the results of these operations on the primary are replicated along with all other data), so you will never see statistics that show that they have run.