Sql cdc9/1/2023 , the default capture instance name is _. When capture is initially enabled for table. The tables are named according to the following convention: They contain the change data that is captured from the Oracle database. The change tables are created from the mirror tables. This section describes the following tables in the CDC database. For more information about this function, see Change Data Capture Functions (Transact-SQL).Īccessing CDC data through the Integration Services CDC Source component is subject to the same rules. Other general change data capture functions for accessing metadata are accessible to all database users through the PUBLIC role, although access to the returned metadata is usually gated by using select access to the underlying source tables, and by membership in any defined gating roles.Ĭhange data may be read by calling special table-based functions generated by the SQL Server CDC component when a capture instance is created. In addition, if a gating role is specified when the capture instance is created, the caller must also be a member of the specified gating role. For information on the SQL Server security model, see Security Model. Access to Change Dataīecause of the SQL Server security model used to gain access to the change data that is associated with a capture instance, the user must be granted select access to all the captured columns of the associated mirror table (access permissions to the original Oracle tables do not provide access to the change tables in SQL Server). This ensures that they cannot be modified. To prevent data from being inserted or updated into the mirror tables, all UPDATE, DELETE, and INSERT operations are denied for PUBLIC. They are used to enable the standard SQL Server CDC infrastructure that is used by the Oracle CDC Instance. The mirror tables are empty no data is stored in them. Oracle source tables with the schema name cdc (not case sensitive) cannot be captured because the cdc schema in SQL Server is reserved for the SQL Server CDC. , in the Oracle source database, a similar empty table is created in the CDC Database, with the same schema and table name. When a CDC database is created and CDC source Oracle tables are set up, the CDC database owner can grant SELECT permission of mirror tables and define SQL Server CDC gating roles to control who accesses the change data. This role assignment allows the Oracle CDC Service to update the tables under the cdc schema with captured data and with control information. If the SQL Server login is also the associated with the dbo user then the cdc_service is not created. This user is made a member of the db_datareader, db_datawriter, and db_ddladmin database roles. When a CDC Database is created and enabled for CDC, a database user called cdc_service is created in the CDC database and is associated with the SQL Server login that the Oracle CDC Service was configured with. The SQL Server system administrator can change the database settings if necessary (for items such as for storage, security, or availability).įor more information about using the CDC Designer Console to create the database tables and the necessary scripts, see Use the New Instance Wizard. In most cases, the CDC database is created using the CDC Designer Console, but it can also be created with a CDC deployment script that is generated using the CDC Designer Console. For more information about the security model, see Security Model. Access to the change tables and change functions is determined by the same security model as the SQL Server CDC. The cdc schema is initially accessible only to the members of the dbowner fixed database role. The CDC database is created and configured using the Oracle CDC Designer Console and it contains the following elements:Ī cdc schema created by enabling the database for SQL Server CDC.Ī set of cdc.xdbcdc_xxxx tables used by the Oracle CDC Instance.Ī set of empty mirror tables with the definitions of the captured tables in tuphe Source Oracle database.Ī set of change tables and change access functions that are generated by the SQL Server CDC mechanism and are identical to those used in the regular, non-Oracle, SQL Server CDC. This database is called the Oracle CDC database (or the CDC database). An Oracle CDC Instance is associated with a SQL Server database by the same name on the target SQL Server instance.
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