An ordering index is used to match values for a filter that
specifies a range. The ds-sync-hist has an ordering
index by default because searches on that attribute often seek entries
with changes more recent than the last time a search was performed.
The following example shows a search that specifies ranges.
$ ldapsearch --port 1389 --baseDN dc=example,dc=com "(&(uidNumber>=1120)(roomNumber>=4500))" uid dn: uid=charvey,ou=People,dc=example,dc=com uid: charvey dn: uid=eward,ou=People,dc=example,dc=com uid: eward dn: uid=mvaughan,ou=People,dc=example,dc=com uid: mvaughan dn: uid=pchassin,ou=People,dc=example,dc=com uid: pchassin
