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where oplog is located. #1551

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where oplog is located. #1551

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10 changes: 9 additions & 1 deletion source/core/replica-set-oplog.txt
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Expand Up @@ -6,7 +6,15 @@ Replica Set Oplog

The :term:`oplog` (operations log) is a special :term:`capped
collection` that keeps a rolling record of all operations that modify
the data stored in your databases. MongoDB applies database operations
the data stored in your databases. It is `oplog.rs` collection in `local` db:

.. code-block:: javascript

$ mongo
> use local
> db.oplog.rs

MongoDB applies database operations
on the :term:`primary` and then records the operations on the
primary's oplog. The :term:`secondary` members then copy and apply
these operations in an asynchronous process. All replica set members
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