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Manage Azure Synapse Link for SQL Server and Azure SQL Database

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Applies to: SQL Server 2022 (16.x) Azure SQL Database

This article provides details on monitoring and managing Azure Synapse Link for SQL change feed, with T-SQL.

The Azure Synapse Link for Azure SQL Database is entirely managed, including provisioning of the landing zone, and uses similar change detection processes as described in this article. For more information, see Synapse Link for Azure SQL Database.

For SQL Server, the landing zone is customer-managed and visible, but it is not recommended or supported to consume or modify the files in the landing zone.

Currently, only a member of the sysadmin server role in SQL Server or the db_owner database role can execute these procedures.

The SQL Server or the Azure SQL Database will maintain metadata specific to each table group.

Note

Enabling Azure Synapse Link for SQL will create a changefeed database user, a changefeed schema, and several tables within the changefeed schema in your source database. Please do not alter any of these objects - they are system-managed.

The following system objects allow for querying the state of the Azure Synapse Link for SQL feature from the source database.

View configuration

To review the current configuration of link, execute the sys.sp_help_change_feed system stored procedure.

EXECUTE sys.sp_help_change_feed

Review change feed errors

To review errors in the Azure Synapse Link change feed, use the dynamic management view sys.dm_change_feed_errors. This DMV will show errors from last 32 sessions. One session might include multiple errors, for example, retry attempts on landing zone failures. This DMV will also show errors faced during snapshot and incremental change publish process.

SELECT * FROM sys.dm_change_feed_errors;

View current activity

To view the current activity, use the dynamic management view sys.dm_change_feed_log_scan_sessions, which returns activity for the Azure Synapse Link fo SQL change feed.

SELECT * FROM sys.dm_change_feed_log_scan_sessions;

Enabling the change feed and creating change feed objects

The system stored procedures sys.sp_change_feed_enable_table, sys.sp_change_feed_enable_db, sys.sp_change_feed_create_table_group are undocumented and for internal use only. Always use Synapse Studio in the Azure portal to create and configure the Azure Synapse Link for SQL Server 2022 (16.x) and Azure SQL Database. The following drop and disable stored procedures are provided to remove the Azure Synapse Link in the case where the Azure Synapse Studio has been removed or is inaccessible.

Disable change feed for database

To disable the change feed at the database level, and subsequently the metadata for all the associated tables, use the sys.sp_change_feed_disable_db system stored procedure.

When the change feed is disabled with active table groups, all connections and schedulers will be stopped immediately/forcefully without waiting for the current operations are completed. No new change feed table groups can be created for the database, and all the existing metadata describing the table groups will be deleted. Re-enabling change feed will result in clean initializations of all table groups and reseeding of all the data.

EXECUTE sys.sp_change_feed_disable_db 
GO

Drop change feed table group

It is recommended to use Azure Synapse Studio in the Azure portal to configure and manage the Azure Synapse Link.

To drop the change feed metadata for a table group, use the sys.sp_change_feed_drop_table_group system stored procedure.

If a table group's change feed is dropped on the SQL Server or Azure SQL Database side, all replication activities for the individual change feed tables associated with this table group will stop. All the associated metadata is also deleted.

EXECUTE sys.sp_change_feed_drop_table_group
      @table_group_id uniqueidentifier 
GO

Drop change feed table

It is recommended to use Azure Synapse Studio in the Azure portal to configure and manage the Azure Synapse Link.

To remove a change feed table from a change feed table group, use the sys.sp_change_feed_disable_table system stored procedure.

When sys.sp_change_feed_disable_table is called, publishing changes for this table will be immediately stopped. Changes scanned but not published yet will be ignored. The last changes published and synchronized to Azure Synapse cannot be guaranteed. To guarantee synchronization between source and target up to a certain time, verify the "last transaction commit time" on the target and then call this procedure.

EXECUTE sys.sp_change_feed_disable_table
    @table_group_id uniqueidentifier,
    @table_id uniqueidentifier
GO

See also

Next steps