Fatal error in shared memory creation

When I type oninit, it said: Fatal error in shared memory creation Why ? Thanks

You need to provide more information. An excerpt from the online.log would be a good starting place. cfbenson wrote in message <3941C7FE.873F1F04@netvigator.com>... >When I type oninit, >it said: >Fatal error in shared memory creation> >Why ? > >Thanks >

cfbenson wrote: > When I type oninit, > it said: > Fatal error in shared memory creation> > Why ? > > Thanks On an internal level, the oninit process had issued a shmget() system call, which returned a value of -1, e.g. failure. The purpose of shmget() is to obtain a shared memory identifier, which must be unique (or to create a shared memory segment if it does not yet exist). The prototype for shmget() is: int shmget(key_t key, int size, int flag); The key value passed to shmget() is the problem. Oninit must use a key generation method that eliminates the possibility of duplicates keys. It includes the value of the SERVNUM configuration parameter, which means that each instance must have a unique SERVNUM, e.g. 1, 2, 3 ... Therefore, one reason for the error you describe, is assigning the same SERVNUM to two instances. A second reason for the error you describe is if the shared memory identifier *already* exists, and the size parameter in the shmget() call is not zero (which means the segment is to be created). This can happen in different ways. For example if the engine is in quiescent mode and the oninit command is then issued with no arguments; this amounts to trying to initialize shared memory when it is already initialized. Another situation is if, because of some glitch, an instance is shutdown but its shared memory segment is not removed. If you are interested in learning more about shared memory this is an excellent reference: "Advanced Programming in the UNIX Environment", by W. Richard Stevens. If you want to see what shared memory segments exist on your UNIX system, the do a man on the ipcs command and read on. Vic