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.

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