Oracle DBA有关回滚段管理试题精选

Q. 1 : What system privilege is required to create a rollback segment ? 1. Create database 2. Create rollback segment 3. Alter database 4. Create segment KEY:2 Q. 2 : Oracle recommends this number of minimum extents in a rollback segment 1. 0 2. 1 3. 2 4. 3 KEY:3 Q. 3 : Oracle recommends that the following segment size when creating a rollback segment 1. INITIAL > NEXT 2. INITIAL = NEXT 3. INITIAL < NEXT 4. NONE OF THE ABOVE 　 KEY:2 　　 Q. 4 : The OPTIMAL parameter for a rollback segment should be set 1. large for long-frequently running transactions, small for short transactions. 2. small for long-frequently running transactions, large for small transactions. 3. small for all transactions 4. large for all transactions KEY:1 Q. 5 : In case of system failure, This type of segment is used to undo the changes 1. Data Segment 2. Temp Segment 3. Redo Segment 4. Rollback Segment KEY:4 : Rollback Segments are used to rollback information that has already been applied to database. During recovery, the database is rolled forward and then backwards to a consistent state. Q. 6 : This is a valid storage parameter when creating a rollback segment 1. FREELISTS 2. OPTIMAL 3. PARTITION 4. NONE OF THE ABOVE 　 KEY:2 Q. 7 : Madhu created a couple of private rollback segments. What should he do now to make them online automatically during startup 1. Grant online during startup to the segments 2. Add rollback_segments=(rbs1,rbs2) in parameter file 3. Drop segments and recreate them as protected 4. None of the above KEY:2 　 Q. 8 : Which is true regarding rollback segments 1. System Rollback Segment Cannot be put in an offline mode 2. Tablespaces containing rollback segments with active transactions can be put in offline mode 3. All of the above 4. None of the above KEY:1 Q. 9 : A rollback segment ____ 1. writes to the redo logs 2. requires one for each tablespace 3. records changes only after they are committed 4. provides for read consistency KEY:4 Q. 10 : Which type of segment can record changes for multiple transactions 1. DATA SEGMENT 2. TEMP SEGMENT 3. ROLLBACK 4. NONE OF THE ABOVE KEY:3 Q. 11 : The type of rollback segment that is created when a tablespace goes offline is 1. PRIVATE 2. PUBLIC 3. DEFFERED 4. PROTECTED KEY:3