# cat "/etc/ldap/slapd.d/cn=config/olcDatabase={1}hdb" 
# BDB definition for example.com
dn: olcDatabase={1}hdb,cn=config
objectClass: olcDatabaseConfig
objectClass: olcHdbConfig
olcDatabase: {1}hdb
olcSuffix: "dc=test,dc=com"
olcDbDirectory: /var/lib/ldap
olcRootDN: "cn=Manager,dc=test,dc=com"
olcRootPW: secret
olcDbIndex: uid pres,eq
olcDbIndex: cn,sn,uid pres,eq,approx,sub
olcDbIndex: objectClass eq
olcAccess: to attrs=userPassword
  by self write
  by anonymous auth
  by dn.base="cn=Admin,dc=test,dc=com" write
  by * none
olcAccess: to *
  by self write
  by dn.base="cn=Admin,dc=test,dc=com" write
  by * read

root@orphalese:~# ls -dlh /var/lib/ldap
drwxr-x--- 2 openldap openldap 4.0K Jun 12 10:36 /var/lib/ldap
root@orphalese:~# ls -lh /var/lib/ldap
total 0

Quesiton: 1) did I do anything wrong? 2) What would you future suggest me to check?

List of what I have checked:

1. Adding entry to the newly created database also doesn't work:
   
   # slapadd -b dc=test,dc=com < /tmp/first.ldif
   slapadd: slap_init no backend for "dc=test,dc=com"
   
   
2. I checked syslog with LogLevel set to 255, end up with a lot of details in syslog but none mentioning keyword 'hdb'.
   
   
3. The above experiment is re-done with hdb replaced with bdb without luck neither.
   
   
4. Authentication also fails:
   $ ldapsearch -x -D cn=Manager,dc=test,dc=com -w secret
   ldap_bind: Invalid credentials (49)
   
   
5. I also checked to make sure slapd.conf doesn't exist.
   
   
6. I also checked there is only one slapd.d directory and slapd is using the same slapd.d that I am editing, by the fact I changed LogLevel in cn=config.ldif and it has vivid effect on syslog.