CDC Guide for Linux, UNIX, and Windows

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Example 1. Creating Current Restart Tokens with Special Override Statements

This example adds a source table, RRTB_SRC_004, to a CDC session that has three other sources. You edit the restart token file to generate restart tokens that represent the current end of the change stream for the additional source.

In the restart token file, you define special override statements with CURRENT_RESTART option for the RRTB_SRC_004 source.

For the other three sources, you retain the existing restart points.

To add a source with CURRENT_RESTART restart tokens:

In Workflow Monitor, use the Stop command to stop the workflow.

After the workflow stops, select the Recover Task command to run a recovery session.

PWXPC writes the following messages in the session log:

PWXPC_12060 [INFO] [CDCRestart] 

===============================
Session restart information:
===============================
Extraction Map Name            Restart Token 1                                    Restart Token 2                    Source
d1dsn9.rrtb0002_RRTB_SRC_002   000000AD220F00000000000000AD220F0000000000000000   C1E4E2D34040000000AD0D9C00000000   GMD storage
d1dsn9.rrtb0001_RRTB_SRC_001   000000AD220F00000000000000AD220F0000000000000000   C1E4E2D34040000000AD0D9C00000000   GMD storage
d1dsn9.rrtb0003_RRTB_SRC_003   000000AD220F00000000000000AD220F0000000000000000   C1E4E2D34040000000AD0D9C00000000   GMD storage

PWXPC also writes the restart tokens in the restart token file that is identified the CDC application connection attributes.

Edit the mapping, session, and workflow to add the source RRTB_SRC_004.

Edit the restart token file to add RESTART1 and RESTART2 special override statements that specify the CURRENT_RESTART option for the RRTB_SRC_004 source.

The updated file appears as follows:

<!-- existing sources
d1dsn9.rrtb0001_RRTB_SRC_001=000000AD220F00000000000000AD220F0000000000000000
d1dsn9.rrtb0001_RRTB_SRC_001=C1E4E2D34040000000AD0D9C00000000
d1dsn9.rrtb0002_RRTB_SRC_002=000000AD220F00000000000000AD220F0000000000000000
d1dsn9.rrtb0002_RRTB_SRC_002=C1E4E2D34040000000AD0D9C00000000
d1dsn9.rrtb0003_RRTB_SRC_003=000000AD220F00000000000000AD220F0000000000000000
d1dsn9.rrtb0003_RRTB_SRC_003=C1E4E2D34040000000AD0D9C00000000
<!-- new source
RESTART1=CURRENT_RESTART 
RESTART2=CURRENT_RESTART

Cold start the session.

PWXPC connects to PowerExchange and generates restart tokens that match the current end of the change stream for the RRTB_SRC_004 source. PWXPC passes the generated restart tokens to PowerExchange to begin change data extraction. Because the restart points for the other sources are earlier than the restart point for RRTB_SRC_004, PWXPC does not pass any change data for RRTB_SRC_004 until it reads the first change after the generated restart point.

Examples of Adding Sources and Creating Restart Tokens

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