ldapadd-entry store failed

[Sovan_Shatpathy@satyam-infoway.com]

                                              Placed At :



Hi,
         Here we have a set up where we are running openldap2.0.14 with berkley
db 3.3.11 as the ldbm backend. There had been no problems till date we were
authenticating against the database and adding new users etc.

But then suddenly today when i tried to do a ldapadd it has started giving a
error which i am pasting below(ldapsearch is happening and has given no
problems) I have not been able to find out as to why this has started happening
all of a sudden ...
###################################################################################
/usr/local/bin/ldapadd -x -D "cn=Manager,o=xyz" -w bumbum -f user.ldif
adding new entry "uid=pl1,ou=south,o=xyz"
ldap_add: Unknown error
        additional info: entry store failed
ldif_record() = 80

#####################################################################################

But when i restored the database (.dbb files ) from the back up then there has
been no problem and ldapadd and every thing else is happening in expected
lines....But the moment i switch back to the old database the same problem
starts occuring again.

I am also pasting the debug output below for reference..

debug

bash-2.02# /usr/local/libexec/slapd -d 256
slapd starting
daemon: conn=0 fd=7 connection from IP=127.0.0.1:37211 (IP=0.0.0.0:0) accepted.
conn=0 op=0 BIND dn="CN=MANAGER,O=XYZ" method=128
ber_flush: 14 bytes to sd 7
conn=0 op=0 RESULT tag=97 err=0 text=
conn=0 op=1 ADD dn="UID=PL1,OU=SOUTH,O=XYZ"
ber_flush: 32 bytes to sd 7
conn=0 op=1 RESULT tag=105 err=80 text=entry store failed
conn=0 op=2 UNBIND
conn=-1 fd=7 closed

Could any one tell me as to why this problem is occuring ??

Thanks and regards
Sovan