Hi, when I run slapindex with my mdb backend the data.mdb files grows and grows and when the configured maxsize (100GB) is reached it stops with cannot allocate memory. 50505d1e => mdb_idl_insert_keys: c_put id failed: Cannot allocate memory (12) 50505d1e => mdb_tool_entry_reindex: txn_aborted! err=80 To test, I created a very basic config. See below. Created a test ldif file with the LDIFGen.jar with 100000 DNs. The file is 110MB. In the slapd.conf is only 1 index configured. uid with eq,sub. When I load this file with slapadd the data.mdb file gets 268MB. (Without any configured index 220MB) When I then run a slapindex, the data.mdb grows to 20GB. If I add 2 more attributes to index. data.mdb gets 36GB index givenname eq,sub index sn eq,sub My question is, is this normal? Why does the data file get's so big with a slapindex and not with a slapadd? OpenLDAP version is 2.4.32 on CentOS6 64bit. # cat /etc/openldap2.4/slapd.conf include /usr/share/openldap2.4/schema/core.schema include /usr/share/openldap2.4/schema/cosine.schema include /usr/share/openldap2.4/schema/corba.schema include /usr/share/openldap2.4/schema/inetorgperson.schema include /usr/share/openldap2.4/schema/java.schema include /usr/share/openldap2.4/schema/krb5-kdc.schema include /usr/share/openldap2.4/schema/kerberosobject.schema include /usr/share/openldap2.4/schema/misc.schema include /usr/share/openldap2.4/schema/nis.schema include /usr/share/openldap2.4/schema/openldap.schema include /usr/share/openldap2.4/schema/autofs.schema pidfile /var/run/ldap2.4/slapd.pid argsfile /var/run/ldap2.4/slapd.args modulepath /usr/lib64/oldap24/openldap2.4 moduleload back_monitor.la moduleload accesslog.la moduleload syncprov.la moduleload auditlog.la loglevel stats serverID 40 ldap://ds71.ogilvy.com database mdb suffix "dc=ogilvy,dc=com" rootdn "cn=manager,dc=ogilvy,dc=com" rootpw secret directory /var/lib/ldap2.4/ogilvy.com limits dn.exact="cn=manager,dc=ogilvy,dc=com" time.soft=unlimited time.hard=unlimited size.soft=unlimited size.hard=unlimited sizelimit 90000 checkpoint 256 5 dbnosync maxsize 104857600000 index uid eq,sub monitoring on database config rootdn "cn=admin,cn=config" rootpw secret database monitor rootdn cn=monitor rootpw secret -- Marco