Logical standby db help

Question

hi
can anyone tell differnece between the two code
==================================================
1)
SQL> ALTER DATABASE STOP LOGICAL STANDBY APPLY;
Database altered.
SQL> EXECUTE DBMS_LOGSTDBY.SKIP(stmt => 'SCHEMA_DDL',-
schema_name => 'HR', -
object_name => 'TESTEMP%');
PL/SQL procedure successfully completed.
SQL> EXECUTE DBMS_LOGSTDBY.SKIP('DML','HR','TESTEMP%');
PL/SQL procedure successfully completed.
SQL> ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE;
Database altered.
============================================================
2)
Stop SQL Apply:
SQL> ALTER DATABASE STOP LOGICAL STANDBY APPLY;
Register the SKIP rules:
SQL> EXECUTE DBMS_LOGSTDBY.SKIP (stmt => 'DML', schema_name => 'HR', -
object_name => 'EMPLOYEES', proc_name => null);
SQL> EXECUTE DBMS_LOGSTDBY.SKIP (stmt => 'SCHEMA_DDL', schema_name => 'HR', -
object_name => 'EMPLOYEES', proc_name => null);
Start SQL Apply:
SQL> ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE;

Answer 1

skipping a DML is absolutely different than skipping a schema_DDL. if all you did is block any DDL operations, then on existing tables a row change will still occur. if it is a new table, it will never happen and you could halt SQL apply with a DML operation on a table that is not created due to you skipping the DDL statement for it
HTH
Victoria DeVore