Well, I don't really know how to check for ident map for the user 'postgres' but i think i figured out that the answer to this questions lies somewhere in the pg_hba.conf file..
following is the output of my pg_hba.conf file...
-------------------------------------------------------------------------------------------------------------
# Database administrative login by UNIX sockets
local   all         postgres                          ident sameuser

# TYPE  DATABASE    USER        CIDR-ADDRESS          METHOD

# "local" is for Unix domain socket connections only
local   all         all                               ident sameuser
# IPv4 local connections:
host    all         all         127.0.0.1/32          md5
# IPv6 local connections:
host    all         all         ::1/128               md5
host    dspace      dspace      127.0.0.1       255.255.255.255 md5
-------------------------------------------------------------------------------------------------------------

Could anyone help me to figure out the solution of the problem..

Regards,
Shashank Sahni...



If Ident authentication failed, then PostgreSQL asked your host OS
what user sent the message containing the command, and the answer to
that question was not what it expected.  Check the ident map for user
'postgres' running on the host from which you issued the command.
Make certain that the OS user account you are using will be mapped to
the 'postgres' DBMS user account.  Also check to be sure that the host
is running an Ident daemon and that it is configured and operating
correctly.

The "create new roles" question should not be related to the problem
you have reported.  Either policy will do as far as DSpace is
concerned, so I would recommend "no".

--
Mark H. Wood, Lead System Programmer   mwood@IUPUI.Edu
Typically when a software vendor says that a product is "intuitive" he
means the exact opposite.

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