LockReplace: xid table corrupted

Hi There,

     I have production systems running postgres for
24x7x365. But suddenly it stops serving the requests
but the postmaster does not die. I cant do select or
even say pgsql <database-name> until i kill postmaster
clear shared memory segments and restart it again. for
all the forth coming requests it says "sorry, too many
clients already".

My system config :-

os:- Red Hat linux 6.2
memory:- 1GB
cpu:- dual CPU
database:- Postgres 6.5.2 ( pl dont suggest to upgrade
to 7.0.2. once this problem is solved. then i can do
testing of my app with postgres 7.0.2)

command:- postmaster -i -N 256 -B 512
>>/usr/local/pgsql/server.log 2>&1 &

can anybody tell me why this happens and what the
solution is for this ????

Regards
Rajesh

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