Logical standby database characteristics

It's important to know the logical standby database properties well in order to decide if your business needs the physical or logical option. The different log apply modes make them distinct solutions for data replication, high availability, and disaster recovery. By using SQL Apply (the log apply method of logical standby databases), Data Guard mines the redo data (which was transferred from the primary database), builds the SQL statements (which will result in the same data change as in the primary database).

Finally executes these SQL statements on the logical standby database as shown in the following diagram:

Maintaining this kind of standby database has its own pros and cons. Now let's see what they are.

Not everything must be duplicated

Depending on your conditions, there may be cases where you don't want all the data in your primary database to be replicated. This is not possible with a physical standby database; however, the logical standby...