Oracle Oracle Database 1Z0-082 Questions & Answers

• Question 81:

  Which three statements are true about dropping and unused columns in an Oracle database? (Choose three.)

  A. A primary key column referenced by another column as a foreign key can be dropped if using the CASCADE option.

  B. An UNUSED column's space is reclaimed automatically when the block containing that column is next queried.

  C. An UNUSED column's space is reclaimed automatically when the row containing that column is next queried.

  D. Partition key columns cannot be dropped.

  E. A DROP COLUMN command can be rolled back

  F. A column that is set to UNUSED still counts towards the limit of 1000 columns per table

  Correct Answer: ADF

  Answer A is RIGHT: Oders is Parent table with PRIMARY KEY ord_no, Order_items is child table which ord_no is REFERENCE KEY that reference ord_no of Parent table, now drop PRIMARY KEY on Orders by command: ALTER TABLE orders DROP COLUMN ORD_NO CASCADE CONSTRAINTS; Answer D is RIGHT: ORA-12984: cannot drop partitioning column Answer F is RIGHT: Unused Columns Count against 1000-column Table Limit Causing ORA-01792 on Compressed Table (Doc ID 2259600.1) and "ORA-01792: Maximum Number Of Columns In A Table Or View Is 1000" AND HIDDEN_COLUMN name is recreated with date and timestamp (Doc ID 2624150.1)

• Question 82:

  Which three statements are true about a self join? (Choose three.)

  A. The ON clause must be used

  B. The query must use two different aliases for the table

  C. It must be an equijoin

  D. It must be an inner join

  E. The ON clause can be used

  F. It can be an outer join

  Correct Answer: BEF

• Question 83:

  You want to write a query that prompts for two column names and the WHERE condition each time it is executed in a session but only prompts for the table name the first time it is executed.

  The variables used in your query are never undefined in your session.

  Which query can be used?

  A. SELECT andandcol1, andandcol2 FROM andtable WHERE andandcondition = andandcond;

  B. SELECT andcol1, andcol2 FROM andandtable WHERE andcondition;

  C. SELECT andcol1, andcol2 FROM "andtable" WHERE andcondition;

  D. SELECT `andandcol1', `andandcol2' FROM andtable WHERE `andandcondition' = `andcond';

  E. SELECT andandcol1, andandcol2 FROM andtable WHERE andandcondition;

  Correct Answer: B

• Question 84:

  Examine the description of the CUSTOMERS table: You want to display details of all customers who reside in cities starting with the letter D followed by at least two characters.

  

  Which query can be used?

  A. SELECT * FROM customers WHERE city LIKE `D_%';

  B. SELECT * FROM customers WHERE city = `%D_';

  C. SELECT * FROM customers WHERE city LIKE `D_';

  D. SELECT * FROM customers WHERE city = `D_%';

  Correct Answer: A

• Question 85:

  Examine this command:

  

  Which two statements are true? (Choose two.)

  A. DML may be performed on tables with one or more extents in this data file during the execution of this command.

  B. The tablespace containing SALES1.DBF must be altered READ ONLY before executing the command.

  C. The tablespace containing SALES1.DBF must be altered OFFLINE before executing the command.

  D. If Oracle Managed Files (OMF) is used, then the file is renamed but moved to DB_CREATE_FILE_DEST.

  E. The file is renamed and stored in the same location

  Correct Answer: AE

  Queries and DML and DDL operations can be performed while the data file is being moved, for example: 1-SELECT statements against tables and partitions 2-Creation of tables and indexes 3- Rebuilding of indexes Other notes: 1- If objects are compressed while the data file is moved, the compression remains the same. 2- You do not have to shut down the database or take the data file offline while you move a data file to

  another

  location, disk, or storage system.

  3- You can omit the TO clause only when an Oracle-managed file is used. In this case, the

  DB_CREATE_FILE_DEST initialization parameter should be set to indicate the new location.

  4-If the REUSE option is specified, the existing file is overwritten.

  note: The REUSE keyword indicates the new file should be created even if it already exists.

  5-If the KEEP clause is specified, the old file will be kept after the move operation. The KEEP clause is not

  allowed

  if the source file is an Oracle-managed file.

• Question 86:

  Which three functions are performed by dispatchers in a shared server configuration? (Choose three.)

  A. writing inbound request to the common request queue from all shared server connections

  B. checking for outbound shared server responses on the common outbound response queue

  C. receiving inbound requests from processes using shared server connections

  D. sending each connection input request to the appropriate shared server input queue

  E. broadcasting shared server session responses back to requesters on all connections

  F. sending shared server session responses back to requesters on the appropriate connection

  Correct Answer: ACF

  Ref: https://docs.oracle.com/cd/B28359_01/server.111/b28310/manproc001.htm#ADMIN11168 An ***idle shared server process picks up*** the virtual circuit from the common queue

• Question 87:

  Which two statements are true about the SET VERIFY ON command? (Choose two.)

  A. It can be used only in SQL*Plus

  B. It displays values for variables used only in the WHERE clause of a query

  C. It can be used in SQL Developer and SQL*Plus

  D. It displays values for variables created by the DEFINE command

  E. It displays values for variables prefixed with andand

  Correct Answer: CD

• Question 88:

  You have been tasked to create a table for a banking application.

  One of the columns must meet three requirements:

  1.

  Be stored in a format supporting date arithmetic without using conversion functions

  2.

  Store a loan period of up to 10 years

  3.

  Be used for calculating interest for the number of days the loan remains unpaid

  Which data type should you use?

  A. INTERVAL YEAR TO MONTH

  B. INTERVAL DAY TO SECOND

  C. TIMESTAMP WITH LOCAL TIMEZONE

  D. TIMESTAMP

  E. TIMESTAMP WITH TIMEZONE

  Correct Answer: B

  Since the third requirement for banking application is

  'Be used for calculating interest for the number of days the loan remains unpaid'

  So, Data Type 'INTERVAL DAY TO SECOND' must be used to calculate duration in number of days.

• Question 89:

  In the spfile of a single instance database, LOCAL_LISTENER is set to LISTENER_1.

  The TNSNAMES.ORA file in $ORACLE_HOME/network/admin in the database home contains:

  

  Which statement is true?

  A. Dynamic service registration cannot be used for this database instance

  B. The LREG process registers services dynamically with the LISTENER_1 listener

  C. LISTENER_1 must also be defined in the LISTENER.ORA file to enable dynamic service registration

  D. There are two listeners named LISTENER and LISTENER_1 running simultaneously using port 1521 on the same host as the database instances

  E. The definition for LISTENER_1 requires a CONNECT_DATA section to enable dynamic service registration

  Correct Answer: B

  The listener forwards client requests to supported services. These services are dynamically registered with the listener. This dynamic registration feature is called service registration. The registration is performed by the Listener Registration (LREG) process. Dynamic service registration does not require any manual configuration in the listener.ora file.

  Reference: https://docs.oracle.com/database/121/NETAG/listenercfg.htm#NETAG292

• Question 90:

  Which three statements are true concerning logical and physical database structures? (Choose three.)

  A. All tablespaces may have one or more data files

  B. The extents of a segment must always reside in the same datafile

  C. A smallfile tablespace might be bigger than a bigfile tablespace

  D. A segment can span multiple data files in some tablespaces

  E. A segment's blocks can be of different sizes

  F. A segment might have only one extent

  G. Segments can span multiple tablespaces

  Correct Answer: CDF