| Event Id | 1166 |
| Source | Active Directory |
| Description | The directory is considering using index %1 to optimize a query. The approximate record count for using index %1 is %2. |
| Event Information | Active Directory might use the index specified in the message to optimize a query. The approximate record count for using this index is specified in the message. No user action is required. |
| Reference Links | Monitoring AD Changes: Article |
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