Resilience
Based on your license, the PowerCenter Integration Service is resilient to the temporary unavailability of PowerCenter Integration Service clients and external components such databases and FTP servers.
The PowerCenter Integration Service tries to reconnect to PowerCenter Integration Service clients within the PowerCenter Integration Service resilience timeout period. The PowerCenter Integration Service resilience timeout period is based on the resilience properties that you configure for the PowerCenter Integration Service, PowerCenter Integration Service clients, and the domain. The PowerCenter Integration Service tries to reconnect to external components within the resilience timeout for the database or FTP connection object.
PowerCenter Integration Service Client Resilience
PowerCenter Integration Service clients are resilient to the temporary unavailability of the PowerCenter Integration Service.
The PowerCenter Integration Service can be unavailable because of network failure or because a PowerCenter Integration Service process fails. PowerCenter Integration Service clients include the application services, PowerCenter Client, the Service Manager, the Web Services Hub, and pmcmd. PowerCenter Integration Service clients also include applications developed using LMAPI.
External Component Resilience
A PowerCenter Integration Service process is resilient to temporary unavailability of external components.
External components can be temporarily unavailable because of network failure or because the component experiences a failure. If the PowerCenter Integration Service process loses the connection to an external component, it tries to reconnect to the component within the retry period for the connection object.
You can configure the following types of external resilience for the PowerCenter Integration Service:
- Database and application connection resilience
The PowerCenter Integration Service depends on external database systems and applications to run sessions and workflows. It is resilient if the database or application supports resilience. The PowerCenter Integration Service is resilient to failures when it initializes the connection to the source or target and when it reads data from a source or writes data to a target. If a database or application is temporarily unavailable, the PowerCenter Integration Service tries to connect for a specified amount of time. You can configure the connection retry period for relational connection objects for some application connection objects.
PowerExchange does not support session-level runtime connection resilience for database connections other than those used for PowerExchange Express CDC for Oracle. If recovery from a dropped PowerExchange connection is required, configure the workflow for automatic recovery of terminated tasks.
Runtime resilience of connections between the PowerCenter Integration Service and PowerExchange Listener is optionally available for the initial connection attempt only. You must set the Connection Retry Period attribute to a value greater than 0 when you define PowerExchange Client for PowerCenter (PWXPC) relational and application connections. The Integration Service then retries the connection to the PowerExchange Listener after the initial connection attempt fails. If the Integration Service cannot connect to the PowerExchange Listener within the retry period, the session fails.
- FTP connection resilience
- If a connection is lost while the PowerCenter Integration Service is transferring files to or from an FTP server, the PowerCenter Integration Service tries to reconnect for the amount of time configured in the FTP connection object. The PowerCenter Integration Service is resilient to interruptions if the FTP server supports resilience.
- Client connection resilience
- You can configure connection resilience for PowerCenter Integration Service clients that are external applications using C/Java LMAPI. You configure this type of resilience in the Application connection object.
Example
You configure a retry period of 180 for an Oracle relational database connection object. If the PowerCenter Integration Service loses connectivity to the database during the initial connection or when it reads data from the database, it tries to reconnect for 180 seconds. If it cannot reconnect to the database, the session fails.