CDC task names in descriptions of SMF record fields and their responsibilities

InfoSphere® CDC for z/OS® is a highly multi-tasked product. Each z/OS task in the InfoSphere CDC for z/OS address space performs a specific function, and several tasks might be grouped to work together to implement a functional entity of replication, such as the entity that mirrors data from a source. The task type names are used in descriptions of the SMF user record data fields. To understand these SMF user record data field descriptions, it is necessary to know the task type names and their associated responsibilities.

MIT - Main Initialization/Termination - One per address space - The task invoked by the JCL EXEC statement, the job step task for the instance address space. It is responsible for initializing the software components, overseeing some of the other tasks in the address space, and releasing resources and terminating software components when the instance is terminating.

OSC - Operations Supervision and Control - One per address space - It monitors the z/OS MODIFY interface for the address space and initiates processing of commands received from operations.

PAL - Product Administration Log - One per address space - It receives requests to generate messages, stores them in the PAL VSAM cluster and sends constructed messages to the CHCPRINT, CHCAUDIT, and CHCREPRT SPOOLed data sets, and to the Management Console.

CIT - Communications Initialization/Termination - One per address space - It is responsible for initializing and terminating the connection to TCP/IP, and it oversees the tasks that use TCP/IP for communication.

PAA - Product Administration Agent - One per logged-on client (Management Console, Java™ API, or CHCCLP) - It accepts administrative requests from an administration client, processes the request and sends back a status reply.

DIT - DBMS Initialization/Termination - One per address space - It is responsible for overseeing the tasks that engage with Db2®.

DSC - DBMS Supervision and Control - One per address space - It is responsible for establishing, monitoring and terminating the connection to Db2, processing operator commands related to the control of subscriptions, and controlling the initiating and terminating of subscription-related tasks.

DAL - DBMS Asynchronous Log - Once per address space - It is responsible for initiating, terminating and monitoring the Db2 MONITOR trace that is needed in order to request log data using IFCID 306 with the Db2 CAF.

DSL - DBMS Synchronous Log - One per subscription - It obtains Db2 log data directly from the Db2 log or indirectly from the Db2 Log Data Cache, depending on the subscription's scraping circumstances.

DDT - DBMS Describe Transmitter - One per subscription - It accesses a subscription's metadata and sends table-related data to the target system to set up or modify a subscription's mappings.

DDR - DBMS Describe Receiver - One per subscription - It receives table-related data from the source system and stores it in the metadata to set up or modify a subscription's mappings.

DTC - DBMS Table Change - One per subscription - It builds SQL from row change information and issues the SQL to Db2 to change the target tables.

DLP - DBMS Log Profile - One per address space - It screens the Db2 log data that is being written for content that cannot be replicated but can have an effect on replication activities.

CMO - Communications Monitor - One per address space - It oversees the setup of communications links between the source and target systems.

CLS - Communications Listener - One per address space - It initiates, terminates, and monitors the TCP listener socket for incoming TCP/IP connections, and starts the tasks that process administrative and replication connections.

CCI - Communications Control Inbound - One per source target pair - It receives control exchanges from the remote (source or target) system.

CCO - Communications Control Outbound - One per source target pair - It sends control exchanges to the remote (source or target) system.

CDI - Communications Data Inbound - One per subscription - It receives replication data from the source system.

CDO - Communications Data Outbound - One per subscription - It sends replication data to the target system.

SCT - Source Control - One per subscription - It handles the source side for a subscription's control exchanges.

TCT - Target Control - One per subscription - It handles the target side for a subscription's control exchanges.

SDT - Source Data - One per subscription - It handles the source side for a subscription's data transmissions.

CVF - Communications Verifier - This task is deprecated and will be removed at some time in the future.

DLR - DBMS Log Reader - One per address space - It obtains Db2 log data directly from the Db2 log and stores it in the Level 1 Cache for the Db2 Log Data Cache feature.

DCW - DBMS Cache Writer - One per address space - It obtains Db2 log data from the Level 1 Cache and stores it in the Level 2 Cache (VSAM cluster) for the Db2 Log Data Cache feature.

MAA - Monitor Administration Agent - One per address space - It collects performance data for the Management Console performance views.

TDT - Target Data - One per subscription - It handles non-SQL-related work for a subscription's data receptions.