Tory M Blue <tmblue@xxxxxxxxx> writes: > Okay the one difference I see in settings is this little gem in 12.. > shared_memory_type mmap Well, v12 is just exposing a switch for something that was hard-wired before. But now I wonder if your 9.5 installation could've been compiled to force it to use SysV shmem instead of POSIX. It would be pretty unusual to have a system where the SysV shmem limits were higher than the POSIX limits --- usually it's the other way 'round. But this'd explain why you're seeing a difference. Does v12 start with the higher shared_buffers setting if you set shared_memory_type = sysv? regards, tom lane
