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. Web Services Hub
  23. Application Service Upgrade
  24. Application Service Databases
  25. Connecting to Databases from Windows
  26. Connecting to Databases from UNIX
  27. Updating the DynamicSections Parameter of a DB2 Database

DTM Buffer Memory

DTM Buffer Memory

The PowerCenter Integration Service launches the DTM process. The DTM allocates buffer memory to the session based on the DTM Buffer Size setting in the session properties. By default, the PowerCenter Integration Service calculates the size of the buffer memory and the buffer block size.
The DTM divides the memory into buffer blocks as configured in the Buffer Block Size setting in the session properties. The reader, transformation, and writer threads use buffer blocks to move data from sources and to targets.
You may want to configure the buffer memory and buffer block size manually. In Unicode mode, the PowerCenter Integration Service uses double bytes to move characters, so increasing buffer memory might improve session performance.
If the DTM cannot allocate the configured amount of buffer memory for the session, the session cannot initialize. Informatica recommends you allocate no more than 1 GB for DTM buffer memory.