We have two equal servers (CPU, RAM, HDD). We are using Postgresql 9.2.14 currently. Have setup master-slave streaming replication.
Running next query at master and slave databases: explain analyze SELECT "om".* FROM "Table" AS "om" WHERE (om."UserID" = 11111) AND (NOT om."Deleted") AND (om."Status" = 0) ORDER BY "StampToSend" asc LIMIT 11; An execution plans are the same on master and slave databases.
An execution time on master database: 138.116 ms An execution time on hot standby slave database with working replication: 1623.496 ms An execution time on slave database with turned off replication (after creating trigger file): 132.354 ms (equal to an execution time on master database).
Why there is so huge difference in execution time between Postgresql with and without working streaming replication? How to improve the situation: to make an execution time on Hot standby slave dtabase with working replication equeal to master database?
Is the issue happening always or only sometimes?
can you please check explain plan output on both the machines with verbose
and buffers options.
explain (analyze, verbose, buffers) /*query*/
The explain output may help in identifying the plan of the query where it is taking
