Hi,
Don't ask me why.
L
Both databases have the same structure.
Both databases are in use before and after the switch.
Buffer cache should be warm, statistics should be up-to-date, therefore.
Thanks,
Markus
Von: Don Seiler <don@xxxxxxxxx>
Gesendet: Mittwoch, 21. November 2018 15:54
An: Zwettler Markus (OIZ) <Markus.Zwettler@xxxxxxxxxx>
Cc: srinivasoguri7@xxxxxxxxx; pgsql-admin@xxxxxxxxxxxxxxxxxxxx
Betreff: Re: query performance after database rename
Hi,
Customer claims about application slowdown after such an database exchange.
I will debug the cluster to get more in-depth in-sight.
No connection pooling used.
Thanks,
Markus
We have to exchange two databases db1
ó db2.
alter database [db1|db2] with allow_connections=false;
select pg_terminate_backend (pg_stat_activity.pid) from pg_stat_activity where pg_stat_activity.datname
in ('db1', 'db2') and pid <> pg_backend_pid();
alter database [db1|db2|temp] rename to [temp|db1|db2];
alter database [db1|db2] with allow_connections=true;
Version 9.6
Off the top of my head, I'd say after switching to a new database, you'd have a cold buffer cache. There's a possibility of old statistics. Are you syncing data changes from the old DB to the new DB?
Also, I'm curious *why* you're doing this.
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