Pop Quiz Answers

Chapter 1, Getting Started

Pop quiz – real-time apply consideration

Q1	User-based errors on the primary database such as an inadvertent table drop will be instantly replicated to the standby database. In order to get rid of this kind of data loss risk, we must use "Flashback Database" feature on primary or standby database.

Chapter 5, Data Guard Protection Modes

Pop quiz – precautions for primary database availability issue in maximum protection mode

Q1

Oracle recommends using two physical standby databases on separate locations to overcome this issue. If we don't have two separate locations we can still install two standby databases on the same location or use Real Application Cluster on the standby database and use redundant network between primary and standby database.

Chapter 6, Data Guard Role Transitions

Pop quiz

Q1	Use the following statement to cancel switchover from the primary or standby databases: SQL> ALTER DATABASE PREPARE TO SWITCHOVER CANCEL;

Chapter 9, Data Guard Configuration Patching

Pop quiz

Q1	Terminal patch can be named as final patch and it can be either CPU or PSU. It will be the last patch to be released on a particular platform of Oracle Database release.

Chapter 10, Common Data Guard Issues

Pop quiz – redo transport authentication problem in only one instance of primary database

Q1	In this case, password file is not correct for the primary instance that shows authentication error. We can simply copy password file from one of the other RAC servers to the failing server to fix this issue.

Pop quiz – using tape for SCN incremental backup

Q1	No, only disk backups can be used to resolve a gap with RMAN SCN incremental backups, because backups on tape cannot be cataloged.