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We have previously mentioned that to view data changes, a user must have SELECT permission on all columns that are part of the capture, and the user must be a member of the role (if any) specified when enabling change data capture at the table level . Enabling change data capture at the database level requires membership in the sysadmin fixed server role, not just database owner permissions . Enabling at the table level requires database owner permissions, not just table owner permissions . DDL operations on a table that is enabled for change data capture can only be performed by a member of the sysadmin fixed server role, the owner of the database, or a member of the db_ddladmin fixed database role . Users who would otherwise have permissions to perform those DDL operations (because they have been directly granted such permission) will receive error 22914 when they attempt to make DDL changes .
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Enabling change data capture within a database has an effect on the transaction log similar to that of transactional replication . The ability to truncate the transaction log is delayed until the log reader has processed any relevant changes . There is also an interaction with operations that would normally be minimally logged . Even though change data capture works with all recovery models, operations (apart from index operations) that would normally be minimally logged are fully logged instead . This allows full details of the changes to be available in the transaction log for collection by the log reader . Errors occur during the log scanning process can be viewed via the sys.dm_cdc_errors dynamic management view . Change tables include data from all columns in the table, not just those columns that were modified . To minimize the size of the change tables, it is possible to include a column list when enabling Change Data Capture for a table . If not all columns are being captured, you can view the list of columns by executing the following command:
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EXEC sys.sp_cdc_get_captured_columns 'dbo.Employees';
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When considering the size of the tables, it is important to take into account the retention requirements to support the target applications . From data that has been retrieved, it is possible to work out whether a particular column has been modified by querying the sys.fn_cdc_has_column_changed function . Standard database backups, database mirroring, and log shipping are all supported with change data capture . If a database with change data capture enabled is restored from a backup to a different server, change data capture is disabled and all related metadata is deleted unless the KEEP_CDC option is used . Databases that are detached and reattached keep their change data capture configuration . If a database with change data capture enabled is attached or restored with the KEEP_CDC option to an edition of SQL Server other than Enterprise, an error 932 occurs and the restore or attach fails .
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If you have been following along with the code in this chapter, you might wish to clean up the changes we have made in this section on change data capture . You can do this by:
EXEC sys.sp_cdc_disable_db; GO USE master; GO DROP DATABASE CDC; GO
Conclusion
SQL Server 2008 has introduced a wealth of new technologies to assist with tracking access and changes to data . It is important to use each technology for its intended purpose:
Extended Events provides a low-level (and low-impact) eventing system and can integrate with Event Tracing for Windows (ETW) . SQL Server Audit is the correct solution for auditing and compliance work . Change tracking is a developer-oriented solution for synchronizing occasionally connected applications . Change data capture is the correct solution for providing a feed of data changes when populating a data warehouse .
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