DDL EXCLUDE ALL in GoldenGate

Question

Looks like this is a new feature but doesn't have enough documentation. Does anyone know what it really is for?
What we want to do is not use GoldenGate for DDL replication in biderctional setup but do it manually in controlled fashion. In streams it maintains internal history of schema changes when DDL changes are applied.
Can someone suggest how to do it with GoldenGate? Please note we receive traffic on both DBs and will be a bidirectional setup.

Answer 1

DDL EXCLUDE ALL is a special processing option that maintains up-to-date object metadata for
GoldenGate, while blocking the replication of the DDL operations themselves. You can use
DDL EXCLUDE ALL when using a method other than GoldenGate to apply DDL to the target,
but you want GoldenGate to replicate data changes to the target objects. It provides the
current metadata to GoldenGate as objects change, thus preventing the need to stop and
start the GoldenGate processes. DDL EXCLUDE ALL does not require the use of an INCLUDE
clause.
To prevent all DDL metadata and operations from being replicated, omit the DDL
parameter entirely. The DDL trigger will continue to record the DDL operations to the
history table, unless disabled manually.
Combining DDL parameter options
The following is an example of how to combine DDL parameter options.
DDL &
INCLUDE UNMAPPED &
OPTYPE alter &
OBJTYPE ‘table’ &
OBJNAME “users.tab*” &
INCLUDE MAPPED OBJNAME “*” &
EXCLUDE MAPPED OBJNAME "temporary.tab*"
The combined filter criteria in this statement specify the following:
● INCLUDE all ALTER TABLE statements for tables that are not mapped with a TABLE or MAP
statement (UNMAPPED scope),
❍ only if those tables are owned by “users” and their names start with “tab,”
● and INCLUDE all DDL operation types for all tables that are mapped with a TABLE or MAP
statement (MAPPED scope).
● and EXCLUDE all DDL operation types for all tables that are MAPPED in scope,
❍ only if those tables are owned by “temporary.”
❍ and only if their names begin with “tab.”