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When trying to get shared memory, shmget() often fails because being unable to allocate memory. The physical size of RAM really shouldn’t be the problem (4GB is enough, I think).
Rather there’s probably anywhere in the systems properties a limit for allocating shared memory set. Does anyone know, where I can find this property?
I’m using Mac OS X Version 10.6
Depends on the OS. PostgreSQL documentation has tips for changing the shared memory limit on various platforms.