PostgreSql Server Problem

Hi,

I am facing this problem when I start the PostgreSql database server and
query any of the database.
What might the problem? Is there any configuration settings that I might
have missed out? Please help.

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bwicdb=# select * from batch_instance;
FATAL 2: open of /usr/share/postgresql/data/pg_clog/0C81 failed: No such
file or directory
FATAL 2: open of /usr/share/postgresql/data/pg_clog/0C81 failed: No such
file or directory
server closed the connection unexpectedly
This probably means the server terminated abnormally before or
while processing the

request.
The connection to the server was lost. Attempting reset: DEBUG: server
process (pid 1328) exited

with exit code 2
DEBUG: terminating any other active server processes
NOTICE: Message from PostgreSQL backend:
The Postmaster has informed me that some other backend died
abnormally and possibly

corrupted shared memory.
I have rolled back the current transaction and am going to
terminate your database system

connection and exit.
Please reconnect to the database system and repeat your query.
NOTICE: Message from PostgreSQL backend:
The Postmaster has informed me that some other backend died
abnormally and possibly

corrupted shared memory.
I have rolled back the current transaction and am going to
terminate your database system

connection and exit.
Please reconnect to the database system and repeat your query.
Failed.
!# DEBUG: all server processes terminated; reinitializing shared memory
and semaphores

IpcMemoryCreate: shmget(key=5432001, size=1441792, 03600) failed: Not
enough core

This error usually means that PostgreSQL's request for a shared memory
segment exceeded available

memory or swap space.
To reduce the request size (currently 1441792 bytes), reduce PostgreSQL's
shared_buffers

parameter (currently 64) and/or
its max_connections parameter (currently 32).

The PostgreSQL Administrator's Guide contains more information about shared
memory configuration.
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Eagerly awaiting a reply.

Thanks and Regards,
Kallol.

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