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sys.sp_cdc_get_ddl_history (Transact-SQL)

  • Artikkeli

Applies to: SQL Server

Returns the data definition language (DDL) change history associated with the specified capture instance since change data capture was enabled for that capture instance. Change data capture isn't available in every edition of SQL Server. For a list of features that are supported by the editions of SQL Server, see Editions and supported features of SQL Server 2022.

Transact-SQL syntax conventions

Syntax

sys.sp_cdc_get_ddl_history [ @capture_instance = ] 'capture_instance'
[ ; ]

Arguments

[ @capture_instance = ] 'capture_instance'

The name of the capture instance associated with a source table. @capture_instance is sysname and can't be NULL.

Return code values

0 (success) or 1 (failure).

Result set

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.
required_column_update bit Indicates the DDL change required a column in the change table to be altered to reflect a data type change made to the source column.
ddl_command nvarchar(max) The DDL statement applied to the source table.
ddl_lsn binary(10) Log sequence number (LSN) associated with the DDL change.
ddl_time datetime Time associated with the DDL change.

Remarks

DDL modifications to the source table that change the source table column structure, such as adding or dropping a column, or changing the data type of an existing column, are maintained in the cdc.ddl_history table. These changes can be reported by using this stored procedure. Entries in cdc.ddl_history are made at the time the capture process reads the DDL transaction in the log.

Permissions

Requires membership in the db_owner fixed database role to return rows for all capture instances in the database. For all other users, requires SELECT permission on all captured columns in the source table and, if a gating role for the capture instance was defined, membership in that database role.

Examples

The following example adds a column to the source table HumanResources.Employee and then runs the sys.sp_cdc_get_ddl_history stored procedure to report the DDL changes that apply to the source table associated with the capture instance HumanResources_Employee.

USE AdventureWorks2022;
GO

ALTER TABLE HumanResources.Employee
ADD Test_Column INT NULL;
GO

-- Pause 10 seconds to allow the event to be logged.
WAITFOR DELAY '00:00:10';
GO

EXECUTE sys.sp_cdc_get_ddl_history
    @capture_instance = 'HumanResources_Employee';
GO

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