What's replicated, what's not?

Logged operations are replicated. These include, but are not limited to:

• DDL
• DML
• Create/alter table space
• Create/alter storage group
• Create/alter buffer pool
• XML data.
• Logged LOBs

Not logged operations are not replicated. These include, but are not limited to:

• Database configuration parameters (this allows primary and standby databases to be configured differently).
• "Not logged initially" tables
• Not logged LOBs
• UDF (User Defined Function) libraries. UDF DDL is replicated. But the libraries used by UDF (such as C or Java libraries)  are not replicated, because they are not stored in the database. Users must manually copy the libraries to the standby.

Note: You can use database configuration parameter BLOCKNONLOGGED to block not logged operations on the primary.