Dear Community need your help once again: We are running on one installation 2 databases: one for tracking any activity on a site another for serving out ads based on certain targeting parameters. The OS is Linux and the Web Server is Apache We keep getting around 5-7 requests / sec and activity involves continuous read and writes into the databases. Now for some unknown reasons ( I mean unknown to us !!!) postmaster keeps shutting off..We worked on it for a while and found one apparent reason to be corrupted data being written...we rectified that..and now we find that postgres shuts itself off with the following error messages: ===== IpcMemoryCreate: shmget failed (Identifier removed) key=5432010, size=120, permi ssion=700 IpcMemoryIdGet: shmget failed (Identifier removed) key=5432010, size=120, permis sion=0 IpcMemoryAttach: shmat failed (Invalid argument) id=-2 FATAL 1: AttachSLockMemory: could not attach segment ===== On another occasion we got the following error message: SISegmentGet: failed: Identifier removed FATAL 1: CreateSharedInvalidationState: failed segment init ERROR: cannot open segment 1 of relation sessions_index1 NOTICE: LockReleaseAll: xid table corrupted FATAL: s_lock(4017aaa4) at bufmgr.c:665, stuck spinlock. Aborting. FATAL: s_lock(4000b011) at spin.c:125, stuck spinlock. Aborting. NOTICE: LockReleaseAll: xid loop detected, giving up pq_flush: send() failed: Bad file descriptor ===== Please help. Also, I wanted to have a quick check on using Postgresql. We are planning to use it as a large scale adserver where one installation could need to handle about 75 requests per second on a 24 / 7 basis. This means picking parameters from an HTTP requests making 5 SELECTS, 25 reads and 5 writes...concurrency issues already taken care off. Thanks for taking time off to write to this one. Kimi ************
