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DBZ-1642 Added Always On docs

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Jiri Pechanec 2019-12-13 12:01:48 +01:00
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documentation/modules/ROOT/pages/connectors/sqlserver.adoc
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@ -94,6 +94,21 @@ If the result is empty then please make sure that the user has privileges to acc
The SQL Server plug-in has not been tested with SQL Server on Azure.
We welcome any feedback from a user to try the plug-in with database in managed environment.
[[always-on-replica]]
=== SQL Server Always On
The SQL Server plug-in can capture changes from Always On read-only replica.
Few pre-requisities are necessary to be fulfilled
* Change data capture is configured and enabled on master node.
SQL Server does not support CDC directly on replica.
* configuration option `database.applicationIntent` must be set to `ReadOnly`.
This is required by SQL Server.
When Debezium detects this configuration option then it will
** set `snapshot.isolation.mode` to `snapshot` as this is the only one transaction isolation mode supported by red-only replica
** commit transaction in every execution of streaming query loop as this is necessary to get the latest view on CDC data
[[how-the-connector-works]]
== How the SQL Server connector works