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2021 Feb 1Z0-052 exam topics
Q111. The TRANS_SUMMARY table contains product-wise transaction details that get updated with every transaction in the system. Each row has cumulative transaction details of a single product and every product is identified by a product code, which is the primary key.
As part of the archival process, the company wants to transfer the rows in the TRANS_SUMMARY table to the TRANS_SUMMARY_DUP table at the end of every quarter of the year. Along with existing products, the company deals with many new products during every quarter.
Which method is best suited for this quarterly data transfer?
A. Using the MERGE command
B. Using the SQL*Loader utility
C. Using the correlated UPDATE command
D. Using the INSERT command to perform bulk operation
Answer: A
Q112. You perform differential incremental level 1 backups of your database on each working day and level 0 backup on Sunday to tape:
Which two statements are true about differential incremental backups? (Choose two.)
A. The backup performed on Sundays contains all the blocks that have ever been used in the database
B. The backup performed on Sundays contains all the blocks that have changed since the last level 1 backup
C. The backup performed on each working day contains all the blocks that have changed since the last level 0 backup
D. The backup performed on Monday contains all the blocks that have changed since the level 0 backup and every other working day contains all the blocks that have changed since the level 1 backup
Answer: AD
Q113. Which two statements correctly describe the relation between a data file and the logical database structures? (Choose two)
A. An extent cannot spread across data files.
B. A segment cannot spread across data files.
C. A data file can belong to only one tablespace.
D. A data file can have only one segment created in it.
E. A data block can spread across multiple data files as it can consist of multiple operating system (OS) blocks.
Answer: AC
Q114. Examine the following statement that is used to modify the primary key constraint on the SALES table:
SQL> ALTER TABLE SALES MODIFY CONSTRAINT pk DISABLE VALIDATE;
Which three statements are true regarding the above command? (Choose three.)
A. The constraint remains valid.
B. The index on the constraint is dropped.
C. It allows the loading of data into the table using SQL *Loader.
D. New data conforms to the constraint, but existing data is not checked.
E. It allows the data manipulation on the table using INSERT/UPDATE/DELETE SQL statements.
Answer: ABC
Q115. Observe the information in the columns:
Which option has the correct match between the memory areas and their contents?
A. 1-c, 2-b, 3-d, 4-a
B. 1-b, 2-c, 3-d, 4-a
C. 1-a, 2-b, 3-c, 4-d
D. 1-a, 2-b, 3-d, 4-c
Answer: C
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Q116. Which naming method uses the tnsnames.ora file to store the connect descriptor used by the client while connecting to the database instance from a remote machine?
A. Host naming method
B. Local naming method
C. External naming method
D. Directory naming method
Answer: B
Q117. Which two statements about the background process of the database writer are true? (Choose two.)
A. It is possible to have multiple database writers in an Oracle instance.
B. It writes dirty buffers, if any, to data files whenever a checkpoint occurs.
C. It writes dirty buffers, if any, to data files whenever a transaction commits.
D. It writes dirty buffers, if any, to data files before the log writer (LGWR) writes.
Answer: AB
Q118. Which is the correct description of a pinned buffer in the database buffer cache?
A. The buffer is currently being accessed
B. The buffer is empty and has not been used
C. The contents of the buffer have changed and must be flushed to the disk by the DBWn process
D. The buffer is a candidate for immediate aging out and its contents are synchronized with the block contents on the disk
Answer: A
Q119. All the database users are presently connected to the database instance and working. The HR user has opened three database sessions and executed the following command in one of his sessions:
SQL> UPDATE persons SET ccode='U031' WHERE ccode='U029'
123 rows updated.
SQL> DELETE FROM persons WHERE exp='Y'
3 rows deleted.
The SYS user opens a new session after HR executed the above commands.
Which sessions can see the effect of the UPDATE and DELETE commands?
A. All sessions of the HR user only
B. All sessions of the HR user and the SYS user
C. The session of the HR user that executed the commands
D. All the sessions for which the database users have access privilege to the PERSONS table
Answer: C
Q120. Which three statements are true about logical structures of the Oracle database? (Choose three.)
A. Each segment contains one or more extents.
B. Multiple tablespaces can share a single data file.
C. A data block is the smallest unit of input/output (I/O) in data files.
D. It is possible to have tablespaces of different block sizes in a database.
E. Each data block in the database always corresponds to one operating system block.
Answer: ACD