Oracle Data Guard 12c Interview Questions and Answers - 1

Question: 1

What are the services required on standby database?

Standby database requires Fetch Archive Log (FAL) client to request and fetch archive log files from primary database, remote file server to receive archived log files from primary database, archiver process to archive redo logs applied to standby database, and Managed Recovery Process (MRP) to apply redo logs to the standby database.

Question: 2

What is the difference between logical standby database and physical stand by database?

A physical standby database is physically same as production database.

It has same file structure as production database while logical database can have different physical structure as compared to production database.

A physical standby is available only when production database is not available while logical standby can be available for reporting in parallel to production database.

Question: 3

Why do you need to have data guard?

Data guard setup ensures that another database is available as a copy of production database at almost real time.

As a result, we have higher protection for enterprise data and the new database is available very quickly without the need to actually restore and recover from backup.

Therefore, data guard offers an excellent disaster recovery solution.

Question: 4

What is data guard?

Data guard is a setup in which you can have one or more standby database available for a production database.

Question: 5

What are the services required on primary database?

Primary database requires log writer to generate log information, archiver process to generate archive log files, and fetch archive log server to request the archive log files from standby database.