The situation is worse than expected

the situation is worse.
now, trying to run an ldapsearch i have the message "can't contact LDAP server".
on syslog the last lines are:

Mar 26 16:11:33 amahoro slapd[1603]: @(#) $OpenLDAP: slapd 2.4.23 (Jun 16 2011 02:53:39) $#012#011buildd@murphy:/build/buildd-openldap_2.4.23-7.2-i386-Y1mwvF/openldap-2.4.23/debian/build/servers/slapd
Mar 26 16:11:33 amahoro slapd[1604]: hdb_db_open: database "dc=amahoro,dc=bi" cannot be opened, err 13. Restore from backup!
Mar 26 16:11:33 amahoro slapd[1604]: bdb(dc=amahoro,dc=bi): txn_checkpoint interface requires an environment configured for the transaction subsystem
Mar 26 16:11:33 amahoro slapd[1604]: bdb_db_close: database "dc=amahoro,dc=bi": txn_checkpoint failed: Invalid argument (22).
Mar 26 16:11:33 amahoro slapd[1604]: backend_startup_one (type=hdb, suffix="dc=amahoro,dc=bi"): bi_db_open failed! (13)
Mar 26 16:11:33 amahoro slapd[1604]: bdb_db_close: database "dc=amahoro,dc=bi": alock_close failed
Mar 26 16:11:33 amahoro slapd[1604]: slapd stopped.

what's happens?


-------- Original Message --------

Subject:	can't modify or add uidNumber attribute
Date:	Mon, 26 Mar 2012 16:21:17 +0200
From:	stefano <stefano.malini@gmail.com>
To:	openldap-technical@openldap.org

hi, i was modifying uidNumber attribute of a user but then has been standing for a few minutes and I stopped it:

root@amahoro:~# ldapmodify -x -W -D 'cn=Manager,dc=amahoro,dc=bi'
Enter LDAP Password:
dn: uid=stefano,cn=Admins,dc=amahoro,dc=bi
changetype: modify
replace: uidNumber
uidNumber: 1001

modifying entry "uid=stefano,cn=Admins,dc=amahoro,dc=bi"
.
.
.
ctrl+c

then with an ldapsearch for this user there was not the uidNumber attribute:

dn: uid=stefano,cn=Admins,dc=amahoro,dc=bi
uid: stefano
cn: Stefano Malini
sn: Malini
gidNumber: 1000
homeDirectory: /home/Admins/stefano
mail: stefano.malini@gmail.com
objectClass: inetOrgPerson
objectClass: top
objectClass: posixAccount
objectClass: shadowAccount
userPassword:: e1NTSEF9b2pNOG1UT3NrT2ZVaDVyd1pUWUpSeWg3YXNxc1lXSHo=
uidNumber: 1001

trying to add it

root@amahoro:~# ldapmodify -x -W -D 'cn=Manager,dc=amahoro,dc=bi'
Enter LDAP Password:
dn: uid=stefano,cn=Admins,dc=amahoro,dc=bi
changetype: add
add: uidNumber
uidNumber: 1001

adding new entry "uid=stefano,cn=Admins,dc=amahoro,dc=bi"
ldap_add: Undefined attribute type (17)
    additional info: add: attribute type undefined

you can see the error message
what is wrong?