Re: symlinking pg_xlog

On Fri, Jun 24, 2005 at 03:18:12PM +0200, KÖPFERL Robert wrote:
>
> due to I/O-bottle necks I think of making a symlink from pg_xlog to another
> physical disk.
> This is a modification inside the cluster dir. What kind of idea is that?
> bad one?

See the "Write-Ahead Logging (WAL)" chapter in the documentation:

http://www.postgresql.org/docs/8.0/static/wal-internals.html

"It is of advantage if the log is located on another disk than the
main database files.  This may be achieved by moving the directory
pg_xlog to another location (while the server is shut down, of
course) and creating a symbolic link from the original location in
the main data directory to the new location."

Several third-party performance-tuning documents make the same
recommendation.

--
Michael Fuhr
http://www.fuhr.org/~mfuhr/