Some Oracle DDL commands and objects are not replicated.
alter database
alter rollback segment
alter session
alter snapshot
alter snapshot log
alter system
alter tablespace
analyze
audit
create control file
create database link
create pfile from spfile
create rollback segment
create schema authorization
create snapshot
create snapshot log
create spfile from pfile
create tablespace
drop database link
drop rollback segment
drop snapshot
drop snapshot/log
drop tablespace
explain
lock table
no audit
rename
set constraints
set role
set transaction
Any objects that are owned by SYS are not replicated. Any object owned by users defined in the list of nonreplicated users is not replicated. You can modify this list using the pdb_ownerfilter command. In addition, Sybase has provided a default list of owners whose objects are not replicated. However, you cannot remove the SYS owner. Use the pdb_ownerfilter command to return, add, or remove the list of owners whose objects are not replicated. See the Replication Agent Reference Manual.