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dbx/causal-consistency.rst

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@@ -11,9 +11,7 @@ To guarantee causal consistency, client sessions must fulfill the
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following requirements:
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- When starting a session, the driver must enable the causal consistency
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option. This option is enabled by default. To learn more, see the
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:manual:`causalConsistency field </reference/method/Mongo.startSession/#mongodb-method-Mongo.startSession>`
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in the {+mdb-server+} manual.
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option. This option is enabled by default.
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- Operations must run in a single session on a single thread. Otherwise,
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the sessions or threads must communicate the operation time and cluster
@@ -47,21 +45,10 @@ consistent sessions provide:
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- If a write operation must precede other write operations, the server
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runs this write operation first.
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For example, you can call |insert-one-method| to insert a document, then call
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|update-one-method| to modify the inserted document. If a secondary node receives
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your update operation and has not yet written the original insert operation to
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its :manual:`oplog </reference/glossary/#std-term-oplog>`, this operation is blocked
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until the secondary applies the changes from the insert.
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* - Writes follow reads
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- If a write operation must follow other read operations, the driver runs
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- If a write operation must follow other read operations, the server runs
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the read operations first.
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For example, you can call |find-one-method| to retrieve a document, then call
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|delete-one-method| to delete the retrieved document. The server that receives
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the delete waits to run the operation until it applies the changes from the original
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find operation.
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.. tip::
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To learn more about the concepts mentioned in this section, see the

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