PostgreSQL fails to start because it cannot create shared memory segments of 512G

Solution Verified - Updated -


DB startup fails because system is unable to create shared memory segments bigger than 256GB


  • Red Hat Enterprise Linux (< RHEL-6.3);
  • Applications resorting to big (>256GB) shared memory segments via mmap(2) / shmget(2) syscalls
  • 64bit architecture

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