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D.2.4. Terminology: Fields appliedLastEventId

The event ID from the source database of the last corresponding event from the stage that has been applied to the database.

MySQL

When extracting from MySQL, the output from trepctl shows the MySQL binary log file and the byte position within the log where the transaction was extracted:

shell> trepctl status
Processing status command...
NAME VALUE
---- -----
appliedLastEventId : mysql-bin.000064:0000000002757461;0
...

Oracle CDC

When extracting from Oracle using the CDC method, the event ID is composed of the Oracle SCN number:

NAME VALUE
---- -----
appliedLastEventId : ora:16626156

Oracle Redo Reader

When extracting from Oracle using the Redo Reader method, the event ID is composed of a combination of Oracle SCN, transaction, and PLOG file numbers, separated by a hash symbol:

NAME VALUE
---- -----
appliedLastEventId : 8931871791244#0018.002.000196e1#LAST#8931871791237#100644

The format is:

COMMITSCN#XID#LCR#MINSCN#PLOGSEQ
  • COMMITSCN

    Last committed Oracle System Change Number (SCN).

  • XID

    Transaction ID.

  • LCR

    Last committed record number.

  • MINSCN

    Minimum stored Oracle SCN.

  • PLOGSEQ

    PLOG file sequence number.