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NEW QUESTION 45
Which two statements are true about Oracle Data Pump export and import operations?
- A. Metadata that is exported and imported can be filtered based on objects and object types.
- B. You cannot specify how partitioned tables should be handled during an import operation.
- C. Only data can be compressed during an export operation.
- D. Tables cannot be renamed during an import operation.
- E. Existing dump files can be overwritten during an export operation.
NEW QUESTION 46
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. An ALTER TABLE MOVE to move the table and ALTER INDEX REBUILD ONLINE to move the indexes.
- B. An ALTER TABLE MOVE to move the table and ALTER INDEX REBUILD to move the indexes.
- C. Edition-Based Table Redefinition.
- D. Online Table Redefinition.
- E. Oracle Data Pump.
* 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.
* 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.
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.
NEW QUESTION 47
You want to import the schema objects of the HR user from the development database DEVDB to the production database PRODDB by using Oracle Data Pump. A database link devdb.us.oracle.com is created between PRODDB and DEVDB.
You execute the following command on the PRODDB database server:
What should you do to resolve the error?
- A. Add network_link = devdb.us.oracle.com.
- B. Replace the dumpfile option with network_1ink = devdb.us.oracle.com.
- C. Replace the schemas option with network_1ink = devdb.us.oracle.com.
- D. Add the SYSTEM user to the schemas option.
- E. Change the dumpfile option value to firstname.lastname@example.org.
NEW QUESTION 48
Examine the following impdp command to import a database over the network from a pre-12c Oracle database (source):
Which three are prerequisites for successful execution of the command? (Choose three.)
- A. The export dump file must be created before starting the import on the target database.
- B. The import operation must be performed by a user on the target database by a user with the DATAPUMP_IMP_FULL_DATABASE role, and the database link must connect to a user with the DATAPUMP_EXP_FULL_DATABASE role on the source database.
- C. All the user-defined tablespaces must be in read-only mode on the source database.
- D. The impdp operation must be performed by the same user that performed the expdp operation.
- E. The source and target database must be running on the same operating system (OS) with the same endianness.
In this case we have run the impdp without performing any conversion if endian format is different then we have to first perform conversion.
NEW QUESTION 49
Which three factors influence the optimizer’s choice of an execution plan?
- A. the optimizer_mode initialization parameter
- B. cardinality estimates
- C. operating system (OS) statistics
- D. fixed baselines
- E. object statistics in the data dictionary
NEW QUESTION 50
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