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Free Oracle 1Z0-062 Exam Questions (page: 15)

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PDF with 419 Questions

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?

  1. Oracle Data Pump.
  2. An ALTER TABLE MOVE to move the table and ALTER INDEX REBUILD to move the indexes.
  3. An ALTER TABLE MOVE to move the table and ALTER INDEX REBUILD ONLINE to move the indexes.
  4. Online Table Redefinition.
  5. Edition-Based Table Redefinition.

Answer(s): D

Explanation:

* 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.



You use a recovery catalog for maintaining your database backups.
You execute the following command:
$rman TARGET / CATALOG rman / cat@catdb
RMAN > BACKUP VALIDATE DATABASE ARCHIVELOG ALL;
Which two statements are true? (Choose two.)

  1. Corrupted blocks, if any, are repaired.
  2. Checks are performed for physical corruptions.
  3. Checks are performed for logical corruptions.
  4. Checks are performed to confirm whether all database files exist in correct locations
  5. Backup sets containing both data files and archive logs are created.

Answer(s): B,D

Explanation:

B (not C): You can validate that all database files and archived redo logs can be backed up by running a command as follows:
RMAN> BACKUP VALIDATE DATABASE ARCHIVELOG ALL;
This form of the command would check for physical corruption. To check for logical corruption,
RMAN> BACKUP VALIDATE CHECK LOGICAL DATABASE ARCHIVELOG ALL;
D: You can use the VALIDATE keyword of the BACKUP command to do the following:
Check datafiles for physical and logical corruption Confirm that all database files exist and are in the correct locations.
Note:
You can use the VALIDATE option of the BACKUP command to verify that database files exist and are in the correct locations (D), and have no physical or logical corruptions that would prevent RMAN from creating backups of them. When performing a BACKUP...VALIDATE, RMAN reads the files to be backed up in their entirety, as it would during a real backup. It does not, however, actually produce any backup sets or image copies (Not A, not E).



You execute the following PL/SQL:

Which two statements are true? (Choose two.)

  1. Fine-Grained Auditing (FGA) is enabled for the PRICE column in the PRODUCTS table for SELECT statements only when a row with PRICE > 10000 is accessed.
  2. FGA is enabled for the PRODUCTS.PRICE column and an audit record is written whenever a row with PRICE > 10000 is accessed.
  3. FGA is enabled for all DML operations by JIM on the PRODUCTS.PRICE column.
  4. FGA is enabled for the PRICE column of the PRODUCTS table and the SQL statements is captured in the FGA audit trial.

Answer(s): A,B

Explanation:

DBMS_FGA.add_policy
* The DBMS_FGA package provides fine-grained security functions.
* ADD_POLICY Procedure
This procedure creates an audit policy using the supplied predicate as the audit condition.
Incorrect:
Not C: object_schema
The schema of the object to be audited. (If NULL, the current log-on user schema is assumed.)



Which action takes place when a file checkpoint occurs?

  1. The checkpoint position is advanced in the checkpoint queue.
  2. 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.
  3. The Database Writer process (DBWn) writes all dirty buffers in the buffer cache to data files.
  4. The Log Writer process (LGWR) writes all redo entries in the log buffer to online redo log files.

Answer(s): B



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