Hello, OS: Windows 2003 64bits Cpu : 2x Opteron Dual core Ram : 8Go Ram Disk : Areca Raid10 6x 200Go sata Postgresql 8.3.4 we're experiencing problems since some weeks with always the same error (same transaction 0 and same pg_clog file 0000) : 2008-10-31 20:14:27 CET 10.0.0.119 exile PANIC: could not access status of transaction 0 2008-10-31 20:14:27 CET 10.0.0.119 exile DETAIL: Could not open file "pg_clog/0000": No such file or directory. 2008-10-31 20:14:27 CET 10.0.0.119 exile STATEMENT: SELECT sp_execute_processes(); This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. 2008-10-31 20:17:32 CET 10.0.0.119 exile FATAL: connection limit exceeded for non-superusers [...] We try to stop the service : 2008-10-31 20:39:30 CET LOG: received fast shutdown request 2008-10-31 20:39:30 CET LOG: aborting any active transactions 2008-10-31 20:39:30 CET 10.0.0.119 exile FATAL: terminating connection due to administrator command Line above repeated again and again 2008-10-31 20:44:20 CET LOG: server process (PID 2772) exited with exit code 3 2008-10-31 20:44:20 CET LOG: terminating any other active server processes 2008-10-31 20:44:20 CET 10.0.0.119 vitevendu WARNING: terminating connection because of crash of another server process 2008-10-31 20:44:20 CET 10.0.0.119 vitevendu DETAIL: The postmaster has commanded this server process to roll back the current transaction and exit, because another server process exited abnormally and possibly corrupted shared memory. 2008-10-31 20:44:20 CET 10.0.0.119 vitevendu HINT: In a moment you should be able to reconnect to the database and repeat your command. Last block above repeated with all bases many times, then : 2008-10-31 20:44:21 CET 10.0.0.119 exile FATAL: the database system is shutting down [...] 2008-10-31 20:44:22 CET LOG: abnormal database system shutdown Event log : 20:14:32 : Faulting application postgres.exe, version 8.3.4.8262, faulting module postgres.exe, version 8.3.4.8262, fault address 0x0024a529. When it crashes the service can't be restarted, no postmaster.pid file to remove, it does not want to restart, we need to reboot server then it recovers but we have strange data and duplicated content so we need to recover from a backup. We vacuum regularly, autovacuum is enabled, cpu usage is ok (<50%) as well as mem usage. I set log to debug1. I don't know what the problem can be :-/ New crash with debug1 (not much info) : 2008-11-03 01:15:45 CET 10.0.0.119 exile LOG: 00000: duration: 2688.000 ms statement: SELECT sp_execute_processes(); 2008-11-03 01:15:45 CET 10.0.0.119 exile LOCATION: exec_simple_query, .\src\backend\tcop\postgres.c:1063 2008-11-03 01:15:46 CET 10.0.0.119 exile PANIC: 58P01: could not access status of transaction 0 2008-11-03 01:15:46 CET 10.0.0.119 exile DETAIL: Could not open file "pg_clog/0000": No such file or directory. 2008-11-03 01:15:46 CET 10.0.0.119 exile LOCATION: SlruReportIOError, .\src\backend\access\transam\slru.c:845 2008-11-03 01:15:46 CET 10.0.0.119 exile STATEMENT: SELECT sp_execute_processes(); This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. Matthieu -- Sent via pgsql-admin mailing list (pgsql-admin@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin