Harsh Azad wrote:
> Hi,
>
> Where are the database index files located in the $PGDATA directory? I
> was thinking on soft linking them to another physical hard disk array.
>
I am not an expert, but what I have done is put the Write-Ahead-Log on one
hard drive, some little-used relations and their indices on a second hard
drive, and the main database files on four other drives. These are SCSI hard
drives and I have two SCSI controllers. /dev/sda and /dev/sdb are on one
controller, and the other four hard drives are on the other controller.
These controllers are on a PCI-X bus all their own.
I put $PGDATA (I do not actually set or use that global variable) on /dev/sda.
[/srv/dbms/dataA/pgsql/data]$ ls -l
total 88
-rw------- 1 postgres postgres 4 Aug 11 13:32 PG_VERSION
drwx------ 5 postgres postgres 4096 Aug 11 13:32 base
drwx------ 2 postgres postgres 4096 Sep 14 09:16 global
drwx------ 2 postgres postgres 4096 Sep 13 23:35 pg_clog
-rw------- 1 postgres postgres 3396 Aug 11 13:32 pg_hba.conf
-rw------- 1 root root 3396 Aug 16 14:32 pg_hba.conf.dist
-rw------- 1 postgres postgres 1460 Aug 11 13:32 pg_ident.conf
drwx------ 4 postgres postgres 4096 Aug 11 13:32 pg_multixact
drwx------ 2 postgres postgres 4096 Sep 14 09:16 pg_subtrans
drwx------ 2 postgres postgres 4096 Aug 12 16:14 pg_tblspc
drwx------ 2 postgres postgres 4096 Aug 11 13:32 pg_twophase
drwx------ 3 postgres postgres 4096 Sep 14 09:13 pg_xlog
-rw------- 1 postgres postgres 15526 Sep 11 22:31 postgresql.conf
-rw------- 1 postgres postgres 13659 Aug 11 13:32 postgresql.conf.dist
-rw------- 1 postgres postgres 56 Sep 14 07:33 postmaster.opts
-rw------- 1 postgres postgres 52 Sep 14 07:33 postmaster.pid
In /dev/sdb are
]$ ls -l
total 12
drwxr-x--- 2 postgres postgres 4096 Aug 18 00:00 pg_log
-rw------- 1 postgres postgres 2132 Sep 14 07:25 pgstartup.log
drwx------ 3 postgres postgres 4096 Aug 12 21:06 stock
The stuff in "stock" are little-used tables and their indices.
Everything else is on the other four drives. I put the index for a table on
a separate drive from the tata for the table.
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