Hi All, I have been reading about increasing PostgreSQL performance by relocating the pg_xlog to a disk other than the one where the database resides. I have the following pg_xlogs on my system.
/raid02/databases/pg_xlog /raid02/rhdb_databases/pg_xlog /raid02/databases-8.0.0/pg_xlog /var/lib/pgsql/data/pg_xlog The second and third entries are from backups that were made before major upgrades so I am expecting that I can blow them away. The first entry is in the directory where my databases are located. I have no idea why the forth entry is there. It is in the PostgreSQL installation directory. Here is my filesystem. # df -k Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda6 9052552 2605292 5987404 31% / /dev/sda1 101089 32688 63182 35% /boot none 1282880 0 1282880 0% /dev/shm /dev/sdb2 16516084 32836 15644256 1% /raid01 /dev/sdb3 16516084 1156160 14520932 8% /raid02 /dev/sda5 2063504 32916 1925768 2% /tmp /dev/sda3 4127108 203136 3714324 6% /var /dev/cdrom 494126 494126 0 100% /mnt/cdrom Can I 1) stop the postmaster 2) rm -rf /var/lib/pgsql/data/pg_xlog 3) mv /raid02/databases/pg_xlog /var/lib/pgsql/data/pg_xlog 4) ln -s /var/lib/pgsql/data/pg_xlog /raid02/databases/pg_xlog 5) start postmaster If I can do that and place the pg_xlog in the installation directory will I create any installation issues the next time I upgrade PostgreSQL? TIA Kind Regards, Keith ---------------------------(end of broadcast)--------------------------- TIP 4: Don't 'kill -9' the postmaster
