Tracing the DDL Trigger

To trace the activity of the Oracle GoldenGate DDL trigger, use the following tools.

  • ggs_ddl_trace.log trace file: Oracle GoldenGate creates a trace file in the USER_DUMP_DEST directory of Oracle. On RAC, each node has its own trace file that captures DDL tracing for that node. You can query the trace file as follows: 

    select value from sys.v_$parameter where name = 'user_dump_dest';

  • ddl_tracelevel script: Edit and run this script to set the trace level. A value of None generates no DDL tracing, except for fatal errors and installation logging. The default value of 0 generates minimal tracing information. A value of 1 or 2 generates a much larger amount of information in the trace file. Do not use 1 or 2 unless requested to do so by a Oracle GoldenGate Technical Support analyst as part of a support case.

  • ddl_cleartrace script: Run this script on a regular schedule to prevent the trace file from consuming excessive disk space as it expands. It deletes the file, but Oracle GoldenGate will create another one. The DDL trigger stops writing to the trace file when the Oracle directory gets low on space, and then resumes writing when space is available again. This script is in the Oracle GoldenGate directory. Back up the trace file before running the script.