Error message at Postgres start up--
pg_ctl start
pg_ctl: another postmaster may be running; trying to start postmaster anyway
-2006-09-24 17:16:59.986 PDT-FATAL:  pre-existing shared memory block (key 5432001, ID 917506) is still in use
-2006-09-24 17:16:59.987 PDT-HINT:  If you're sure there are no old server processes still running, remove the shared memory block with the command "ipcclean", "ipcrm", or just delete the file "postmaster.pid".
pg_ctl: could not start postmaster
Examine the log output.


The postmaster.pid from the previous session(before reboot)--
postmaster.pid
6173
/usr/local/pgsql/data
  5432001    917506

Postgres log after I deleted above postmaster.pid and ran pg_ctl again.--
~
-2006-09-24 17:21:40.693 PDT-LOG:  database system was interrupted at 2006-09-24 14:57:34 PDT
-2006-09-24 17:21:40.716 PDT-LOG:  checkpoint record is at 0/59AD3D8
-2006-09-24 17:21:40.716 PDT-LOG:  redo record is at 0/59AD3D8; undo record is at 0/0; shutdown FALSE
-2006-09-24 17:21:40.716 PDT-LOG:  next transaction ID: 32898; next OID: 456080
-2006-09-24 17:21:40.716 PDT-LOG:  next MultiXactId: 1; next MultiXactOffset: 0
-2006-09-24 17:21:40.716 PDT-LOG:  database system was not properly shut down; automatic recovery in progress
-2006-09-24 17:21:40.728 PDT-LOG:  record with zero length at 0/59AD41C
-2006-09-24 17:21:40.728 PDT-LOG:  redo is not required
-2006-09-24 17:21:40.765 PDT-LOG:  database system is ready
-2006-09-24 17:21:40.811 PDT-LOG:  transaction ID wrap limit is 2147484146, limited by database "postgres"