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10/04/2012

sys.sp_cdc_help_change_data_capture (Transact-SQL)

Returns the change data capture configuration for each table enabled for change data capture in the current database. Up to two rows can be returned for each source table, one row for each capture instance. Change data capture is available only in SQL Server 2008 Enterprise, Developer, and Evaluation editions.

Topic link icon Transact-SQL Syntax Conventions

Syntax

sys.sp_cdc_help_change_data_capture 
  [ [ @source_schema = ] 'source_schema' ]
  [, [ @source_name = ] 'source_name' ]

Arguments

[ @source_schema = ] 'source_schema'
Is the name of the schema in which the source table belongs. source_schema is sysname, with a default of NULL. When source_schema is specified, source_name must also be specified.

If non-NULL, source_schema must exist in the current database.

If source_schema is non-NULL, source_name must also be non-NULL.
[ @source_name = ] 'source_name'
Is the name of the source table. source_name is sysname, with a default of NULL. When source_name is specified, source_schema must also be specified.

If non-NULL, source_name must exist in the current database.

If source_name is non-NULL, source_schema must also be non-NULL.

Return Code Values

0 (success) or 1 (failure)

Result Sets

Column name	Data type	Description
source_schema	sysname	Name of the source table schema.
source_table	sysname	Name of the source table.
capture_instance	sysname	Name of the capture instance.
object_id	int	ID of the change table associated with the source table.
source_object_id	int	ID of the source table.
start_lsn	binary(10)	Log sequence number (LSN) representing the low endpoint for querying the change table. NULL = the low endpoint has not been established.
end_lsn	binary(10)	LSN representing the high endpoint for querying the change table. In SQL Server 2008, this column is always NULL.
supports_net_changes	bit	Net change support is enabled.
has_drop_pending	bit	Not used in SQL Server 2008.
role_name	sysname	Name of the database role used to control access to the change data. NULL = a role is not used.
index_name	sysname	Name of the index used to uniquely identify rows in the source table.
filegroup_name	sysname	Name of the filegroup in which the change table resides. NULL = change table is in the default filegroup of the database.
create_date	datetime	Date that the capture instance was enabled.
index_column_list	nvarchar(max)	List of index columns used to uniquely identify rows in the source table.
captured_column_list	nvarchar(max)	List of captured source columns.

Remarks

When both source_schema and source_name default to NULL, or are explicitly set the NULL, this stored procedure returns information for all of the database capture instances that the caller has SELECT access to. When source_schema and source_name are non-NULL, only information on the specific named enabled table is returned.

Permissions

When source_schema and source_name are NULL, the caller's authorization determines which enabled tables are included in the result set. Callers must have SELECT permission on all of the captured columns of the capture instance and also membership in any defined gating roles for the table information to be included. Members of the db_owner database role can view information about all defined capture instances. When information for a specific enabled table is requested, the same SELECT and membership criteria are applied for the named table.

Examples

A. Returning change data capture configuration information for a specified table

The following example returns the change data capture configuration for the HumanResources.Employee table.

USE AdventureWorks2008R2;
GO
EXECUTE sys.sp_cdc_help_change_data_capture 
    @source_schema = N'HumanResources', 
    @source_name = N'Employee';
GO

B. Returning change data capture configuration information for all tables

The following example returns configuration information for all enabled tables in the database that contain change data that the caller is authorized to access.

USE AdventureWorks2008R2;
GO
EXECUTE sys.sp_cdc_help_change_data_capture;
GO

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