Error ID: SQL Server error 976
Primarily this error occurs when something tries to run against a database in an Availability Group when the instance is acting as the secondary and therefore the databases are read only. For example, SQL Agent jobs may be configured on both the primary and secondary instances to run integrity checks against the databases (known as DBCC CHECKDB). They would succeed on the primary as they are read/write databases, but would fail on the secondary as they are read only. It is possible to configure both instances as read/write, but this requires additional licensing from Microsoft. The error can also occur for other reasons, such as a disconnected replica, suspended data movement or a temporary network issue.
If the error has occurred because of a SQL Agent job trying to run against a database on a secondary instance that is read only, the solution is to amend the job so that it only runs if the instance is the primary. There is no check box to tick unfortunately, it needs a step adding at the beginning of the job to determine whether it is running on the primary or the secondary and then only move onto the next step if it is the primary. If the error has occurred due to another reason, further investigation is required to identify the specific cause (e.g. a network issue).
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