Table of Contents

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  1. Preface
  2. Analyst Service
  3. Content Management Service
  4. Data Integration Service
  5. Data Integration Service Architecture
  6. Data Integration Service Management
  7. Data Integration Service Grid
  8. Data Integration Service Applications
  9. Metadata Manager Service
  10. Model Repository Service
  11. PowerCenter Integration Service
  12. PowerCenter Integration Service Architecture
  13. High Availability for the PowerCenter Integration Service
  14. PowerCenter Repository Service
  15. PowerCenter Repository Management
  16. PowerExchange Listener Service
  17. PowerExchange Logger Service
  18. SAP BW Service
  19. Search Service
  20. System Services
  21. Test Data Manager Service
  22. Test Data Warehouse Service
  23. Web Services Hub
  24. Application Service Upgrade
  25. Application Service Databases
  26. Connecting to Databases from Windows
  27. Connecting to Databases from UNIX
  28. Updating the DynamicSections Parameter of a DB2 Database

PowerExchange Connection Pool Management

PowerExchange Connection Pool Management

The Data Integration Service connects to a PowerExchange data source through the PowerExchange Listener. A PowerExchange connection pool is a set of connections to a PowerExchange Listener.
When a DTM process or the Data Integration Service process runs a data transformation job, it requests a connection instance from a connection pool. If the DTM process or the Data Integration Service process requires a PowerExchange connection instance, it requests the connection instance from PowerExchange.
When PowerExchange receives a request for a connection to a Listener, it uses a connection in the pool that has matching characteristics, including user ID and password. If the pool does not contain a connection with matching characteristics, PowerExchange modifies and reuses a pooled connection to the Listener, if possible. For example, if PowerExchange receives a request for a connection for USER1 on NODE1 and finds only a pooled connection for USER2 on NODE1, PowerExchange reuses the connection, signs off USER2, and signs on USER1.
When PowerExchange returns a Listener connection to the pool, it closes any files or databases that the Listener had opened.
If you associate multiple database connection objects with the same Listener node name, PowerExchange combines the connections into a single pool. For example, if you associate multiple database connections to NODE1, a connection pool is used for all PowerExchange connections to NODE1. To determine the maximum size of the connection pool for the Listener, PowerExchange adds the
Maximum # of Connections
values that you specify for each database connection that uses the Listener.
If you want each database connection object to use a separate connection pool, define multiple NODE statements for the same PowerExchange Listener and associate each database connection object with a different Listener node name.
PowerExchange connection pooling does not reuse netport connections unless the user name and password match.