Types of DDL Changes Ignored
When a statement such as CREATE TABLE AS
SELECT is executed on the source database, the Capture process
extracts the statement as the INSERT row LCRs. The CREATE TABLE
AS SELECT statement actually involves an INSERT statement.
Therefore, it is natural that the Streams capture process
extracts the DML changes.
In addition, the following types of changes
are also ignored by a Capture process:
The session control statements ALTER
SESSION and SET ROLE, etc. which are very specific to the
application environment in which they are used.
The system control statement: ALTER SYSTEM.
Invocations of PL/SQL procedures. However,
the invocation is not captured if the execution, such as the
PL/SQL procedure, makes changes to the tables. Such changes are
captured by the Capture process.
Note: Online table redefinition, using the
dbms_redefinition package, is not supported on a table or
schema for which a Capture process captures the changes.
Effect of nologging and
nologging or unrecoverable
operations are often used by administrators and application
users to increase performance levels and to load large data sets
into the database tables in a relatively short time. DBAs are
willing to take the risk of re-loading such data in case a media
recovery is performed and the non-logged operations are not
played back during the recovery.