Deron escribió:
> I see a lot of suggestions to increase maintenance work mem if running
> pg_restore. This is to help with the index creation and initial sort from
> what I understand. A few tests I ran does show this helps.
> Does anyone know if there is a way to only "temporarily" set this setting?
> I have some DBs that are bloated and I have a script to run off hours (I
> don't like working late). This uses pg_dump and pg_restore to recover the
> disk space. I found that this is usually faster than 'vacuum full', and is
> useful in some cases.
You can specify it via PGOPTIONS:
$ PGOPTIONS='-c maintenance_work_mem=1GB' psql
Welcome to psql 8.2.5, the PostgreSQL interactive terminal.
Type: \copyright for distribution terms
\h for help with SQL commands
\? for help with psql commands
\g or terminate with semicolon to execute query
\q to quit
alvherre=# show maintenance_work_mem ;
maintenance_work_mem
----------------------
1GB
(1 row)
alvherre=# \q
$ psql
Welcome to psql 8.2.5, the PostgreSQL interactive terminal.
Type: \copyright for distribution terms
\h for help with SQL commands
\? for help with psql commands
\g or terminate with semicolon to execute query
\q to quit
alvherre=# show maintenance_work_mem ;
maintenance_work_mem
----------------------
16MB
(1 row)
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support