Administering the DDL Log Files in 12c

Administering the DDL Log Files in 12c

The DDL log is created only if the ENABLE_DDL_LOGGING initialization parameter is set to TRUE. When this parameter is set to FALSE, DDL statements are not included in any log. A subset of executed DDL statements is written to the DDL log.

How to administer the DDL Log?

--> Enable the capture of certain DDL statements to a DDL log file by setting ENABLE_DDL_LOGGING to TRUE.

--> DDL log contains one log record for each DDL statement.

--> Two DDL logs containing the same information:

--> XML DDL log: named log.xml

--> Text DDL: named ddl_<sid>.log

When ENABLE_DDL_LOGGING is set to true, the following DDL statements are written to the log:

ALTER/CREATE/DROP/TRUNCATE CLUSTER

ALTER/CREATE/DROP FUNCTION

ALTER/CREATE/DROP INDEX

ALTER/CREATE/DROP OUTLINE

ALTER/CREATE/DROP PACKAGE

ALTER/CREATE/DROP PACKAGE BODY

ALTER/CREATE/DROP PROCEDURE

ALTER/CREATE/DROP PROFILE

ALTER/CREATE/DROP SEQUENCE

CREATE/DROP SYNONYM

ALTER/CREATE/DROP/RENAME/TRUNCATE TABLE

ALTER/CREATE/DROP TRIGGER

ALTER/CREATE/DROP TYPE

ALTER/CREATE/DROP TYPE BODY

DROP USER

ALTER/CREATE/DROP VIEW

Example

$ more ddl_orcl.log

Thu Nov 15 08:35:47 2012

diag_adl:drop user app_user

Locate the DDL Log File

$ pwd

/u01/app/oracle/diag/rdbms/orcl/orcl/log

$ ls

ddl ddl_orcl.log debug test

$ cd ddl

$ ls

log.xml

Notes: 

- Setting the ENABLE_DDL_LOGGING parameter to TRUE requires licensing the Database Lifecycle Management Pack.

- This parameter is dynamic and you can turn it on/off on the go.

- alter system set ENABLE_DDL_LOGGING=true/false;