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Examine the following query output:
You issue the following command to import tables into the hr schema:
$ > impdp hr/hr directory = dumpdir dumpfile = hr_new.dmp schemas=hr TRANSFORM=DISABLE_ARCHIVE_LOGGING: Y
Which statement is true?
Note from Oracle Documentation:
With redo logging disabled, the disk space required for redo logs during an Oracle Data Pump import will be smaller. However, to ensure recovery from media failure, the DBA should do an RMAN backup after the import completes.
Even with this parameter specified, there is still redo logging for other operations of Oracle Data Pump. This includes all CREATE and ALTER statements, except CREATE INDEX, and all operations against the master table used by Oracle Data Pump during the import.
Which two partitioned table maintenance operations support asynchronous Global Index Maintenance in Oracle database 12c? (Choose two.)
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.
You have altered a non-unique index to be invisible to determine if queries execute within an acceptable response time without using this index.
Which two are possible if table updates are performed which affect the invisible index columns? (Choose two.)
Unlike unusable indexes, an invisible index is maintained during DML statements.
Note:
* Oracle 11g allows indexes to be marked as invisible. Invisible indexes are maintained like any other index, but they are ignored by the optimizer unless the OPTIMIZER_USE_INVISIBLE_INDEXES parameter is set to TRUE at the instance or session level. Indexes can be created as invisible by using the INVISIBLE keyword, and their visibility can be toggled using the ALTER INDEX command.
A senior DBA asked you to execute the following command to improve performance:
You checked the data in the SUBSCRIBE_LOG table and found that it is a large table containing one million rows.
What could be a reason for this recommendation?
The most of the rows in SUBSCRIBE_LOG table are accessed once a week.
Which three statements are true regarding the use of the Database Migration Assistant for Unicode (DMU)? (Choose three.)
A: In certain situations, you may want to exclude selected columns or tables from
scanning or conversion steps of the migration process.
D: Exceed column limit
The cell data will not fit into a column after conversion.
E: Need conversion
The cell data needs to be converted, because its binary representation in the
target character set is different than the representation in the current character
set, but neither length limit issues nor invalid representation issues have been
found.
* Oracle Database Migration Assistant for Unicode (DMU) is a unique next-generation migration tool providing an end-to-end solution for migrating your databases from legacy encodings to Unicode.
