postgres@vaibhav-Vostro-1014:/home/vaibhav$ service postgresql restart
 * Restarting PostgreSQL 8.4 database server                                                         * The PostgreSQL server failed to start. Please check the log output:
2011-07-18 11:04:16 IST FATAL:  could not create shared memory segment: No space left on device
2011-07-18 11:04:16 IST DETAIL:  Failed system call was shmget(key=5432001, size=98738176, 03600).
2011-07-18 11:04:16 IST HINT:  This error does *not* mean that you have run out of disk space. It occurs either if all available shared memory IDs have been taken, in which case you need to raise the SHMMNI parameter in your kernel, or because the system's overall limit for shared memory has been reached.  If you cannot increase the shared memory limit, reduce PostgreSQL's shared memory request (currently 98738176 bytes), by reducing its shared_buffers parameter (currently 11520) and/or its max_connections parameter (currently 103).
	The PostgreSQL documentation contains more information about shared memory configuration.
                                                                                             [fail]