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ipcclean(1)             PostgreSQL Server Applications             ipcclean(1)




NAME

       ipcclean  -  remove  shared memory and semaphores from an aborted Post-
       greSQL server


SYNOPSIS

       ipcclean


DESCRIPTION

       ipcclean removes all shared memory segments and semaphore sets owned by
       the  current  user.  It  is intended to be used for cleaning up after a
       crashed  PostgreSQL  server  (postmaster(1)).  Note  that   immediately
       restarting  the server will also clean up shared memory and semaphores,
       so this command is of little real utility.

       Only the database administrator should execute this program as  it  can
       cause  bizarre  behavior (i.e., crashes) if run during multiuser execu-
       tion. If this command is executed while a postmaster  is  running,  the
       shared  memory  and  semaphores  allocated  by  the  postmaster will be
       deleted. This will result in a general failure of the  backend  servers
       started by that postmaster.


NOTES

       This  script  is a hack, but in the many years since it was written, no
       one has come up with an equally effective and portable solution.  Since
       the postmaster can now clean up by itself, it is unlikely that ipcclean
       will be improved upon in the future.

       The script makes assumption about the format  of  output  of  the  ipcs
       utility  which  may  not  be  true  across different operating systems.
       Therefore, it may not work on your particular OS.



Application                       2002-11-22                       ipcclean(1)

Mac OS X 10.9.1 - Generated Sun Jan 5 13:57:13 CST 2014
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