About InfoSphere Classic Change Data Capture for z/OS

IBM® InfoSphere® Classic Change Data Capture for z/OS® (InfoSphere Classic CDC for z/OS) is a replication solution that captures changes to non-relational mainframe data and delivers them to relational databases, producing an accurate relational replica of your mainframe data on supported target databases in near-real time.

With the InfoSphere Classic CDC for z/OS solution, you can replicate changes to a CDC Replication target engine and you can publish changes in a delimited format directly to IBM MQ.

To capture changes to your IBM IMS and VSAM data sources, InfoSphere Classic CDC for z/OS reads data from logs that the data source provides that describe the changes to your non-relational mainframe data. The source engine packages the changes as discrete change messages that contain a relational description of the insert, update, and delete operations on the data. It then sends the change messages to a CDC Replication target engine or sends change messages in a delimited format to MQ.

The CDC target engine delivers them in one of the following ways:

Applies the changes to a supported target database
Sends the changes to IBM InfoSphere DataStage® for transformation processing

If you are looking for a smaller footprint on z/OS, you can use IBM Data Replication VSAM for z/OS Remote Source. The replication engine is distributed as a Linux® container, which you use to set up, maintain, and administer the replication environment.

The InfoSphere Classic CDC for z/OS solution requires the following software components:

Component		Function
Source replication engine	InfoSphere Classic CDC for z/OS	The source engine is a Classic data server that runs in its own z/OS address space. The data server contains the services and other components that manage replication and process changes. The data server manages change data capture and refresh processing by coordinating the components and activities that the following sections describe in greater detail: Maintains the metadata catalog which contains definitions for tables and underlying data source information as well as stored procedures. Maintains metadata that describes subscriptions and replication mappings to ensure accurate replication Processes commands from users or from remote configuration and administration tools Transfers change messages to the target engine over a TCP/IP connection
Source replication engine configuration and administration tool	IBM InfoSphere Classic Data Architect	The GUI tool for InfoSphere Classic CDC for z/OS, which connects to the source engine from a client workstation to simplify configuration tasks and create table mappings.
Target replication engine	InfoSphere Change Data Capture	The target engine receives change messages from the source engine and applies the changes to the specified target tables in the correct order. It also performs these additional functions: Tracks restart positions that specify where log reading resumes after replication stops and restarts Performs code page conversions Exchanges metadata about subscriptions and replication mappings with the source engine to validate your deployment Processes commands from users or from remote configuration and administration tools
Target replication engine configuration and administration tools	InfoSphere Data Replication Management Console InfoSphere Data Replication Access Server InfoSphere Data Replication Access Manager	Management Console configures and monitors replication from a client workstation. Access Server is a server that Management Console connects to for authentication purposes. Access Manager creates datastores and users, assigns roles and privileges to users, and authenticates and connects users to datastores.