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Tablespace for LogMiner Objects on the Primary Database

The metadata for a logical Oracle instance is maintained in SYS and SYSTEM schema, which, by default, is kept in the system tablespace. These metadata are mostly related to LogMiner activity on the logical standby site. It is good practice to create a dedicated tablespace on the primary database for these objects and to move these objects from the system tablespace to the new tablespace before a backup is made to be used to create a logical standby database.

As a result, this tablespace will exist in both the primary and the standby database. Although this is an optional step in creating a logical standby database, it might save considerable time later when a switchover between the primary and the logical Oracle instance is performed.

Oracle provides the dbms_logmnr_d.set_tablespace procedure to move all these log miner related objects to a new tablespace. The syntax is:


Once these preparatory tasks have been completed, the process to start the creation of the logical standby database can begin. The next section will present the step-by-step process of creating a logical standby database. For this text, it is assumed that there is no other Oracle instance associated with this primary database.

The above text is an excerpt from the book: Oracle Data Guard Handbook

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