DB Indexing

To Whom It May Concern:

Is there a difference in indexing between the following two OLC config options:

Option 1:

olcDbIndex: uidNumber eq olcDbIndex: gidNumber eq

Option 2:

olcDbIndex: uidNumber,gidNumber eq

In other words, does OpenLDAP consider them both options to be the same, where each (uidNumber and gidNumber) are indexed separately into separate indices?  Or, does option 2 index the possible combinations of uidNumber/gidNumber, whereas option 1 indexes them separately?

Thank you for you help.

Thx, Jeff