pg_dump problem

Dear group,

I have two databases in my system.

In firstdb i am having the following problem:
firstdb=# \d targets
ERROR: could not access status of transaction 362
DETAIL: could not open file
"/var/lib/pgsql/data/pg_clog/0000": No such file or
directory

when I vacuumed it:
$ vacuumdb firstdb
vacuumdb: vacuuming of database "firstdb" failed:
ERROR: could not access status of transaction 11
DETAIL: could not open file
"/var/lib/pgsql/data/pg_clog/0000": No such file or
directory



Second problem:

Issue with secondb - arraydb

$ vacuumdb arraydb
VACUUM

Suspecting there is something going on with
postgres,
I wanted to take a backup of the arraydb.

here is what I am doing:

$ sudo pg_dump arraydb >
arraydb_bcup_Aug_05_2006.dump

There is nothing in this. I created dumps long back
and they are heavy.
I restarted the postgre server /etc/init.d/postgres
restart Despite this, I am having problems.

$ ls -lh
total 8.0K
-rw-r--r-- 1 speri postgres 0 Aug 5 20:17
arradb_bcup_Aug_05_2006.out

What is in the /var/lib/pgsql/data/pg_clog
$ sudo ls -lh /var/lib/pgsql/data/pg_clog
total 80K
-rw------- 1 postgres postgres 72K Aug 5 20:12 0001

Logs:

Surprisingly my logs is empty . Is this because I
restarted the server.

what could be the problem in the cases of first and
second problems.

looking forward to hear from experts eagerly.

Thanks

__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com