Services overview

This topic provides an overview of the services that are used by IMS Remote Source.

IMS Remote Source is implemented by using a proprietary services architecture in both the container and z/OS environment. The following table identifies the different services that are used. For each service the following information is provided:

Descriptive service name
The service class and service name. These names are referenced in the configuration parameter descriptions and identity which parameters are applicable to which service.
The environment in which the service executes.
A brief overview of what the service does.

Table 1. Services overview
Service Name	Service Class	Environment	Purpose
Administration	PAA CECPAA	Container	The administration service manages the configuration and administration of replication. The management functions include setting up replication, error reporting during setup, and access to the system event log. The administration service also maintains the replication runtime environment.
Capture	CAP CECCAP	Container	The capture service manages change data capture and refresh operations. Those operations include management of the log reader service, change Streams, and communication with the target server.
Connection handler	INIT CACINIT	Container	The connection handler listens for TCP/IP connection requests from client applications and routes the requests to the appropriate administration, monitoring, operator, and query processor tasks for mapping operations.
Database Resource Adapter	DRA CACDRA	z/OS	The DRA service interface configures the DRA interface and connects to an IMS DBCTL region to access IMS data.
Logger	LOG CACLOG	Container and z/OS	The logger service receives messages from all services in the data server and coordinates writing the messages to a common log. The logger also reports data server activities and is used for error diagnosis.
Monitor	MAA CECMAA	Container	The monitoring service reports metrics about replication data and latency information. Other management functions include reporting, receiving display and report commands, and producing the reports needed from runtime information.
Operator	OPER CACOPER	Container	The operator service supports a command operator interface and also handles communications between the Classic data server and the configuration support in the Classic Data Architect.
Query processor	JDBC remote data source name CACQP	Container	The query processor performs table and view maintenance operations.
Region controller	CNTL CACCNTL	Container and z/OS	The region controller activates each service according to the configuration parameters that you define. The region controller starts, stops, and monitors the other tasks that run within the Classic data server. On z/OS, the region controller also includes a mater terminal operator (MTO) interface that you can use to monitor and control an address space for a Classic data server.
IMS log reader	LRSI CECLRS	z/OS	The IMS log reader service processes stream requests sent from the capture service. The IMS log reader service identifies which IMS logs must be read by using the DBRC API to access the RECON in an IMS data sharing environment. Stream requests cause the IMS log reader service to return IMS change data after reading and merging the required IMS logs. It uses the DRA interface to read the contents of an IMS database during refresh operations.