---
title: ds-mon-oldest-csn
description: OID
component: pingds
version: 8.1
page_id: pingds:schemaref:at-ds-mon-oldest-csn
canonical_url: https://docs.pingidentity.com/pingds/8.1/schemaref/at-ds-mon-oldest-csn.html
---

# ds-mon-oldest-csn

|                             |                                                                 |
| --------------------------- | --------------------------------------------------------------- |
| *OID*                       | 1.3.6.1.4.1.36733.2.1.1.344                                     |
| *Names*                     | ds-mon-oldest-csn                                               |
| *Description*               | Oldest CSN present in the replica database                      |
| *Syntax*                    | [CSN(ChangeSequenceNumber)](s-CSN\(ChangeSequenceNumber\).html) |
| *Equality matching rule*    | [caseIgnoreMatch](mr-caseIgnoreMatch.html)                      |
| *Ordering matching rule*    | [caseIgnoreOrderingMatch](mr-caseIgnoreOrderingMatch.html)      |
| *Substring matching rule*   | [caseIgnoreSubstringsMatch](mr-caseIgnoreSubstringsMatch.html)  |
| *Single value*              | true                                                            |
| *User modification allowed* | true                                                            |
| *Usage*                     | userApplications                                                |
| *Origin*                    | OpenDJ Directory Server                                         |
| *Schema file*               | 02-config.ldif                                                  |
| *Used by*                   | [ds-monitor-replica-db](oc-ds-monitor-replica-db.html)          |