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  • PowerExchange for CDC and Mainframe 10.4.0
  • All Products

Table of Contents

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  1. Introduction
  2. PowerExchange Client for PowerCenter (PWXPC)
  3. PowerExchange ODBC
  4. PowerExchange Interfaces for PowerCenter Tips
  5. Datatypes and Code Pages
  6. PowerExchange Interfaces for PowerCenter Troubleshooting

PowerExchange Interfaces for PowerCenter

PowerExchange Interfaces for PowerCenter

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How Restart Points Are Determined

How Restart Points Are Determined

The restart tokens PWXPC uses depends on how you start the CDC session and whether you provide any override restart tokens in the restart token file.
Based on the start type, PWXPC determines the restart point in one of the following ways:
  • Cold start
    . When you cold start a CDC session, PWXPC reads only the restart token file to acquire restart tokens for all sources and does not attempt to recover the session. The session continues to run until stopped or interrupted.
  • Warm start
    . When you warm start a CDC session, PWXPC reconciles the restart tokens provided in the restart token file, if any, with the restart tokens that exist in the state file or state tables. If necessary, PWXPC performs recovery processing. The session continues to run until stopped or interrupted.
  • Recover operation
    . When you recover a CDC session, PWXPC reads the restart tokens from the state file and state tables and writes the tokens to the restart token file. If necessary, PWXPC performs recovery processing. After PWXPC finishes updating the restart token file and doing any necessary recovery, the session ends.
You can specify restart token overrides in the restart token file.
Each CDC source in the CDC session has its own unique restart point. Do not create and populate the restart token file with restart points for sources prior to running a CDC session for the first time. When restart tokens do not exist in the restart token file and no entry exists for the session in the state file or state tables, PWXPC passes null restart tokens to PowerExchange for all sources in the session.
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