Oracle 1Z0-062 Online Practice Questions and Exam Preparation

Oracle 1Z0-062 Online Questions & Answers

• Question 281:

  Which two partitioned table maintenance operations support asynchronous Global Index Maintenance in Oracle database 12c? (Choose two.)

  A. ALTER TABLE SPLIT PARTITION
  B. ALTER TABLE MERGE PARTITION
  C. ALTER TABLE TRUNCATE PARTITION
  D. ALTER TABLE ADD PARTITION
  E. ALTER TABLE DROP PARTITION
  F. ALTER TABLE MOVE PARTITION
  C. ALTER TABLE TRUNCATE PARTITION
  E. ALTER TABLE DROP PARTITION

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  Asynchronous Global Index Maintenance for DROP and TRUNCATE PARTITION This feature enables global index maintenance to be delayed and decoupled from a DROP and TRUNCATE partition without making a global index unusable. Enhancements include faster DROP and TRUNCATE partition operations and the ability to delay index maintenance to off-peak time.

• Question 282:

  What is the result of executing a TRUNCATE TABLE command on a table that has Flashback Archiving enabled?

  A. It fails with the ORA-665610 Invalid DDL statement on history-tracked message
  B. The rows in the table are truncated without being archived.
  C. The rows in the table are archived, and then truncated.
  D. The rows in both the table and the archive are truncated.
  C. The rows in the table are archived, and then truncated.

• Question 283:

  You are the DBA supporting an Oracle 11g Release 2 database and wish to move a table containing several DATE, CHAR, VARCHAR2, and NUMBER data types, and the table's indexes, to another tablespace.

  The table does not have a primary key and is used by an OLTP application.

  Which technique will move the table and indexes while maintaining the highest level of availability to the application?

  A. Oracle Data Pump.
  B. An ALTER TABLE MOVE to move the table and ALTER INDEX REBUILD to move the indexes.
  C. An ALTER TABLE MOVE to move the table and ALTER INDEX REBUILD ONLINE to move the indexes.
  D. Online Table Redefinition.
  E. Edition-Based Table Redefinition.
  D. Online Table Redefinition.

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  *

  Oracle Database provides a mechanism to make table structure modifications without significantly affecting the availability of the table. The mechanism is called online table redefinition. Redefining tables online provides a substantial increase in availability compared to traditional methods of redefining tables.

  *

  To redefine a table online:

  Choose the redefinition method: by key or by rowid

  *

  By key--Select a primary key or pseudo-primary key to use for the redefinition. Pseudo-primary keys are unique keys with all component columns having NOT NULL constraints. For this method, the versions of the tables before and after redefinition should have the same primary key columns. This is the preferred and default method of redefinition.

  *

  By rowid--Use this method if no key is available. In this method, a hidden column named M_ROW$$ is added to the post-redefined version of the table. It is recommended that this column be dropped or marked as unused after the redefinition is complete. If COMPATIBLE is set to 10.2.0 or higher, the final phase of redefinition automatically sets this column unused. You can then use the ALTER TABLE ... DROP UNUSED COLUMNS statement to drop it.

  You cannot use this method on index-organized tables. Note:

  *

  When you rebuild an index, you use an existing index as the data source. Creating an index in this manner enables you to change storage characteristics or move to a new tablespace. Rebuilding an index based on an existing data source removes intra-block fragmentation. Compared to dropping the index and using the CREATE INDEX statement, re-creating an existing index offers better performance.

  Incorrect:

  Not E: Edition-based redefinition enables you to upgrade the database component of an application while it is in use, thereby minimizing or eliminating down time.

• Question 284:

  As part of a manual upgrade of your database to Oracle Database 12c, you plan to issue the command: SQL> STARTUP UPGRADE

  Which three statements are true about the upgrade process? (Choose three.)

  A. All system triggers are disabled during the upgrade process.
  B. Only queries on fixed views execute without errors until you run the catctl.pl script.
  C. The COMPATIBLE parameter must be set to at least 12.1.0 before issuing the command.
  D. All job queues remain active during the upgrade process.
  E. Only connections AS SYSDBA are allowed during the upgrade process.
  A. All system triggers are disabled during the upgrade process.
  D. All job queues remain active during the upgrade process.
  E. Only connections AS SYSDBA are allowed during the upgrade process.

• Question 285:

  Your databases all run in ARCHIVELOG mode.

  A newly created database has no RMAN backups.

  Examine these commands:

  CONFIGURE RETENTION POLICY TO REDUNDANCY 2;

  RMAN> BACKUP TABLESPACE SYSTEM;

  ..

  backup set complete, elapsed time: 00:00:03

  ..

  RMAN> BACKUP TABLESPACE SYSTEM , SYSAUX;

  ..

  backup set complete, elapsed time: 00:00:04

  ..

  RMAN> BACKUP DATABASE;

  ..

  backup set complete, elapsed time: 00:00:07

  ..

  Which two are true about the execution of the third backup command? (Choose two.)

  A. The first backup of the SYSTEM tablespace is deleted.
  B. A backup is not performed for the SYSAUX tablespace.
  C. The first backup of the SYSTEM tablespace becomes obsolete.
  D. A backup is performed for the SYSAUX tablespace.
  E. A backup is not performed for the SYSTEM tablespace.
  F. The first backup of the SYSTEM tablespace becomes expired.
  B. A backup is not performed for the SYSAUX tablespace.
  F. The first backup of the SYSTEM tablespace becomes expired.

• Question 286:

  You want to reduce fragmentation and reclaim unused space for the SALES table but not its dependent objects. During this operation, you want to ensure the following:

  -Long-running queries are not affected.

  -No extra space is used.

  -

  Data manipulation language (DML) operations on the table succeed at all times throughout the process.

  -

  Unused space is reclaimed both above and below the high water mark.

  Which ALTER TABLE option would you recommend?

  A. DEALLOCATE UNUSED
  B. SHRINK SPACE CASCADE
  C. SHRINK SPACE COMPACT
  D. ROW STORE COMPRESS BASIC
  C. SHRINK SPACE COMPACT

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  References: https://docs.oracle.com/cd/B28359_01/server.111/b28310/schema003.htm

• Question 287:

  Which action takes place when a file checkpoint occurs?

  A. The checkpoint position is advanced in the checkpoint queue.
  B. All buffers for a checkpointed file that were modified before a specific SCN are written to disk by DBWn and the SCN is stored in the control file.
  C. The Database Writer process (DBWn) writes all dirty buffers in the buffer cache to data files.
  D. The Log Writer process (LGWR) writes all redo entries in the log buffer to online redo log files.
  B. All buffers for a checkpointed file that were modified before a specific SCN are written to disk by DBWn and the SCN is stored in the control file.

• Question 288:

  Which statement is true about profiles?

  A. Resource limits specified in a profile assigned to a user are always enabled.
  B. A user can exist without any profile.
  C. A profile can be assigned only to one user.
  D. Password management using profiles is always enabled.
  D. Password management using profiles is always enabled.

• Question 289:

  Which three tools or tasks are run by default as part automated maintenance tasks? (Choose three.)

  A. Automatic Database Diagnostic Monitor
  B. optimizer statistics gathering
  C. SQL Access Advisor
  D. Segment Advisor
  E. Automatic SQL Tuning Advisor
  B. optimizer statistics gathering
  D. Segment Advisor
  E. Automatic SQL Tuning Advisor

• Question 290:

  You are managing an Oracle Database 12c database. The database is open, and you plan to perform Recovery Manager (RMAN) backups.

  Which three statements are true about these backups? (Choose three.)

  A. The backups would be consistent.
  B. The backups would be possible only if the database is running in ARCHIVELOG mode.
  C. The backups need to be restored and the database has to be recovered in case of a media failure.
  D. The backups would be inconsistent.
  E. The backups by default consist of all the data blocks within the chosen files or the full database.
  B. The backups would be possible only if the database is running in ARCHIVELOG mode.
  C. The backups need to be restored and the database has to be recovered in case of a media failure.
  D. The backups would be inconsistent.

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  References: https://docs.oracle.com/cd/E18283_01/server.112/e10897/backrest.htm#insertedID4