Yes, it should be replicated.
If you are using Logical Standby here you can check which DDL statements skipped/supported Data Type and DDL Support on a Logical Standby Database
The link is for Oracle Database 11g.
I can not understand why you are mentioning most of the time the logical standby. When I am using physical standby .
And besides it seems logical standby is not so good to use? I found this quotes from OraFaq.
Submitted by pete91z on Mon, 2008-12-08 08:13.
We have a logical standby database in our organisation, primarily to shift the reporting load away from out live oltp. However, maintaining it is pretty much a full time job. Despite extensive tuning of the apply processes and over a hundred oracle patches, our logical is usually 3 - 5 hours behind live thus making it useless as a failover, and barely adequate for reporting. We have also had to skip a lot of the tables that incur large amounts of dml and refresh these once a day. So my view and experience of logical standby is that it is one to avoid - If you're after a reporting system, buy a reporting system. If you want a failover, use physical standby.
Well, you didn't specify for what kind of standby database you're asking, and things are very different between physical standby and logical standby.
It depends, for example, if you want to upgrade the database software, apply patch set, have a read/write standby database then Logical Standby is one of the solutions.
But, generally speaking physical standby (block level) is the best approach for Data Guard implementation.
We are using physical standby 126.96.36.199
How about these commands, will they be replicated to? or I need to run it at the standby db side.
alter system set audit_trail=OS
alter system set audit_sys_operations=TRUE
Any parameter changes will not replicate.
alter system set audit_trail=OS -->> this will not get replicated
However, any changes made at the database object level gets replicated to the physical standby database.
"REVOKE DBA FROM HR; and GRANT HR_ROLE TO HR;" -->> this will get replicated