CDC Guide for i5/OS

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Example 2. Creating Current Restart Tokens with the DTLUAPPL Utility

This example adds the source table, RRTB_SRC_004, to a CDC session that has three other sources. You use the DTLUAPPL utility to generate restart tokens that represent the current end of the change stream.

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

In Workflow Monitor, use 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 in the CDC application connection attributes.

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

Run the DTLUAPPL utility with RSTTKN GENERATE parameter to generate restart tokens that represent the current end of the change stream for the additional source.

Use the following DTLUAPPL control cards:

mod  APPL dummy DSN7 rsttkn generate
   mod rsttkn rrtb004
end appl dummy
print appl dummy

The PRINT command produces the following output:

Registration name=<rrtb004.1> tag=<DB2DSN7rrtb0041>
             Sequence=<00000DBF240A0000000000000DBF240A00000000>
             Restart =<C1E4E2D3404000000DBF238200000000>

You can add eight zeros to the end of the Sequence value to create the sequence value for the restart token file.

Edit the restart token file to add the source and its restart tokens.

The updated file contains the following lines:

<!-- 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
d1dsn9.rrtb0004_RRTB_SRC_004=00000DBF240A0000000000000DBF240A0000000000000000
d1dsn9.rrtb0004_RRTB_SRC_004=C1E4E2D3404000000DBF238200000000

Cold start the session.

PWXPC passes the 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.

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CDC Guide for i5/OS

CDC Guide for i5/OS

Example 2. Creating Current Restart Tokens with the DTLUAPPL Utility

Example 2. Creating Current Restart Tokens with the DTLUAPPL Utility