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4 changes: 2 additions & 2 deletions source/core/sharding-shard-key.txt
Original file line number Diff line number Diff line change
Expand Up @@ -141,11 +141,11 @@ performance.
Query Isolation
```````````````

The fastest queries in a sharded environment are those that
Generally, the fastest queries in a sharded environment are those that
:program:`mongos` will route to a single shard, using the
:term:`shard key` and the cluster meta data from the :ref:`config server
<sharding-config-server>`. For queries that don't include the shard
key, :program:`mongos` must query all shards, wait for their response
key, :program:`mongos` must query all shards, wait for their responses
and then return the result to the application. These "scatter/gather"
queries can be long running operations.

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