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Oracle 1Z0-062 Dumps
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NEW QUESTION 129
Examine the commands executed to monitor database operations:
$> conn sys oracle/oracle@prod as sysdba
SQL > VAR eid NUMBER
SQL > EXEC: eid := DBMS_SQL_MONITOR.BEGIN_OPERATION ('batch_job' ,
FORCED_TRACKING => 'Y');
Which two statements are true? (Choose two.)
- A. All subsequent statements in the session will be treated as one database operation and will be monitored.
- B. Database operations will be monitored only when they consume a significant amount of resource.
- C. Database operations for all sessions will be monitored.
- D. Only DML and DDL statements will be monitored for the session.
- E. Database operations will be monitored only if the STATISTICS_LEVEL parameter is set to TYPICAL and CONTROL_MANAGEMENT_PACK_ACCESS is set DIAGNISTIC + TUNING.
Answer: A,E
Explanation:
C: Setting the CONTROL_MANAGEMENT_PACK_ACCESS initialization parameter to DIAGNOSTIC+TUNING (default) enables monitoring of database operations. Real-Time SQL Monitoring is a feature of the Oracle Database Tuning Pack.
Note:
* The DBMS_SQL_MONITOR package provides information about Real-time SQL Monitoring and Real-time Database Operation Monitoring.
*(not B) BEGIN_OPERATION Function
starts a composite database operation in the current session.
/ (E) FORCE_TRACKING - forces the composite database operation to be tracked when the operation starts. You can also use the string variable 'Y'.
/ (not A) NO_FORCE_TRACKING - the operation will be tracked only when it has consumed at least 5 seconds of CPU or I/O time. You can also use the string variable 'N'.
NEW QUESTION 130
You plan to migrate your database from a File system to Automata Storage Management (ASM) on same
platform.
Which two methods or commands would you use to accomplish this task? (Choose two.)
- A. Data Pump Export and import
- B. RMAN CONVERT command
- C. Conventional Export and Import
- D. DBMS_FILE_TRANSFER with transportable tablespace
- E. The BACKUP AS COPY DATABASE . . . command of RMAN
Answer: B,E
Explanation:
Explanation/Reference:
Explanation:
A:
1. Get the list of all datafiles.
Note: RMAN Backup of ASM Storage
There is often a need to move the files from the file system to the ASM storage and vice versa. This may
come in handy when one of the file systems is corrupted by some means and then the file may need to be
moved to the other file system.
D: Migrating a Database into ASM
* To take advantage of Automatic Storage Management with an existing database you must migrate that
database into ASM. This migration is performed using Recovery Manager (RMAN) even if you are not
using RMAN for your primary backup and recovery strategy.
* Example:
Back up your database files as copies to the ASM disk group.
BACKUP AS COPY INCREMENTAL LEVEL 0 DATABASE
FORMAT '+DISK' TAG 'ORA_ASM_MIGRATION';
References:
NEW QUESTION 131
You notice a performance change in your production Oracle 12c database. You want to know which change caused this performance difference.
Which method or feature should you use?
- A. Taking a new snapshot and comparing it with a preserved snapshot
- B. Active Session History (ASH) report
- C. Compare Period ADDM report
- D. AWR Compare Period report
Answer: D
Explanation:
Explanation/Reference:
Explanation:
The awrddrpt.sql report is the Automated Workload Repository Compare Period Report. The awrddrpt.sql script is located in the $ORACLE_HOME/rdbms/admin directory.
Incorrect:
Not A: Compare Period ADDM
Use this report to perform a high-level comparison of one workload replay to its capture or to another replay of the same capture. Only workload replays that contain at least 5 minutes of database time can be compared using this report.
NEW QUESTION 132
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?
- A. Only CREATE INDEX and CREATE TABLE statements generated by the import are logged.
- B. All database operations performed by the impdp command are logged.
- C. None of the operations against the master table used by Oracle Data Pump to coordinate its activities are logged.
- D. Only CREATE TABLE and ALTER TABLE statements generated by the import are logged.
Answer: D
Explanation:
Oracle Data Pump disable redo logging when loading data into tables and when creating indexes.
The new TRANSFORM option introduced in data pumps import provides the flexibility to turn off the redo generation for the objects during the course of import. The Master Table is used to track the detailed progress information of a Data Pump job.
The Master Table is created in the schema of the current user running the Pump Dump export or import, and it keeps tracks of lots of detailed information.
NEW QUESTION 133
Examine the following command;
ALTER SYSTEM SET enable_ddl_logging = TRUE;
Which statement is true?
- A. Only DDL commands that resulted in the creation of new segments are logged.
- B. All DDL commands are logged in the alert log file.
- C. All DDL commands are logged in a different log file that contains DDL statements and their execution dates.
- D. Only the data definition language (DDL) commands that resulted in errors are logged in the alert log file.
- E. All DDL commands are logged in XML format in the alert directory under the Automatic
Diagnostic Repository(ADR) home.
Answer: B
Explanation:
Once DDL logging is turned on, every DDL command will be logged in the alert log file and also the log.xml file.
Note:
* By default Oracle database does not log any DDL operations performed by any user. The default settings for auditing only logs DML operations.
* Oracle 12c DDL Logging - ENABLE_DDL_LOGGING
The first method is by using the enabling a DDL logging feature built into the database. By default it is turned off and you can turn it on by setting the value ofENABLE_DDL_LOGGING initialization parameter to true.
* We can turn it on using the following command. The parameter is dynamic and you can turn it on/off on the go.
SQL> alter system set ENABLE_DDL_LOGGING=true;
System altered.
Elapsed: 00:00:00.05
SQL>
Once it is turned on, every DDL command will be logged in the alert log file and also the log.xml file.
NEW QUESTION 134
Your 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. Edition-Based Table Redefinition.
- B. Online Table Redefinition.
- C. An ALTER TABLE MOVE to move the table and ALTER INDEX REBUILD ONLINE to move the indexes.
- D. Oracle Data Pump.
- E. An ALTER TABLE MOVE to move the table and ALTER INDEX REBUILD to move the indexes.
Answer: B
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.
NEW QUESTION 135
You configure your database Instance to support shared server connections.
Which two memory areas that are part of PGA are stored in SGA instead, for shared server connection? (Choose two.)
- A. Location of a part of the runtime area for SELECT statements
- B. Location of the runtime area for DML and DDL Statements
- C. Stack space
- D. Private SQL area
- E. User session data
Answer: D,E
Explanation:
A: PGA itself is subdivided. The UGA (User Global Area) contains session state information, including stuff like package-level variables, cursor state, etc. Note that, with shared server, the UGA is in the SGA. It has to be, because shared server means that the session state needs to be accessible to all server processes, as any one of them could be assigned a particular session. However, with dedicated server (which likely what you're using), the UGA is allocated in the PGA.
C: The Location of a private SQL area depends on the type of connection established for a session. If a session is connected through a dedicated server, private SQL areas are located in the server process' PGA. However, if a session is connected through a shared server, part of the private SQL area is kept in the SGA.
Note:
* System global area (SGA)
The SGA is a group of shared memory structures, known as SGA components, that contain data and control information for one Oracle Database instance. The SGA is shared by all server and background processes. Examples of data stored in the SGA include cached data blocks and shared SQL areas.
* Program global area (PGA)
A PGA is a memory region that contains data and control information for a server process.
It is nonshared memory created by Oracle Database when a server process is started.
Access to the PGA is exclusive to the server process. There is one PGA for each server process. Background processes also allocate their own PGAs. The total memory used by all individual PGAs is known as the total instance PGA memory, and the collection of individual PGAs is referred to as the total instance PGA, or just instance PGA. You use database initialization parameters to set the size of the instance PGA, not individual PGAs.
References:
NEW QUESTION 136
The HR user receives the following error while inserting data into the sales table:
On investigation, you find that the users tablespace uses Automatic Segment Space Management (ASSM). It is the default tablespace for the HR user with an unlimited quota on it.
Which two methods would you use to resolve this error?
- A. Enabling resumable space allocation by setting the RESUMABLE_TIMEOUT parameter to a nonzero value
- B. Adding a data file to the USERS tablespace
- C. Changing segment space management for the USERS tablespace to manual
- D. Altering the data file associated with the USERS tablespace to ex automatically
- E. Creating a new tablespace with autoextend enabled and changing the default tablespace of the HR user to the new tablespace
Answer: D,E
Explanation:
Explanation/Reference:
Explanation:
NEW QUESTION 137
The DEFERRED_SEGMENT_CREATION parameter is set to TRUE in your database instance.
You execute the following command to create a table:
Which two statements are true? (Choose two.)
- A. The table is created without a segment because the storage clause is missing.
- B. A segment is allocated when the first row is inserted in the table.
- C. A segment is allocated for the table if the ALTER TABLE... ALLOCATE EXTENT command is issued.
- D. The table is created and extents are immediately allocated as per the default storage defined for its tablespace.
- E. A segment is allocated when an index is created for any column in the table.
Answer: B,C
NEW QUESTION 138
Your database instance has the following parameter setting:
OS_AUTHENT_PREFIX = OPS$
You execute the following command:
And then grant OPS$GUEST_USERthe CREATE SESSIONprivilege.
Which two statements are true? (Choose two.)
- A. The authentication details for GUEST_USERare stored in the database password file.
- B. GUEST_USERis forced to change the password at the first login.
- C. A local GUEST_USEROS account should exist before GUEST_USERcan log on to the database.
- D. GUEST_USERcan query the tables created in the USERStablespace by default.
- E. GUEST_USERcan log on to the database without specifying a username and password.
Answer: C,E
NEW QUESTION 139
Which two tasks can be performed on an external table? (Choose two.)
- A. partitioning the table
- B. updating the table by using an update statement
- C. creating an invisible index
- D. creating a view
- E. creating a public synonym
Answer: D,E
Explanation:
Explanation/Reference:
Explanation:
http://docs.oracle.com/cd/B28359_01/server.111/b28310/tables013.htm#ADMIN01507 You can, for example select, join, or sort external table data. You can also create views and synonyms for external tables. However, no DML operations (UPDATE, INSERT, or DELETE) are possible, and no indexes can be created, on external tables.
NEW QUESTION 140
Your multitenant container database (CDB) contains a pluggable database, HR_PDB. The default permanent tablespace in HR_PDB is USERDATA. The container database (CDB) is open and you connect RMAN.
You want to issue the following RMAN command:
RMAN > BACKUP TABLESPACE hr_pdb:userdata;
Which task should you perform before issuing the command?
- A. Place the root container in the nomount stage.
- B. Place the root container in ARHCHIVELOG mode.
- C. Ensure that HR_PDB is open.
- D. Take the user data tablespace offline.
Answer: B
Explanation:
Explanation/Reference:
Explanation:
NEW QUESTION 141
Your database is configured in ARCHIVELOGmode.
Examine the RMAN configuration parameters:
Examine the command:
RMAN> BACKUP DATABASE PLUS ARCHIVELOG DELETE INPUT;
What is the outcome?
- A. It fails because the DELETE INPUToption can be used only with the BACKUP ASBACKUPSET command.
- B. It executes successfully and creates a backup set of the database along with archived log files and then deletes the original archived log files.
- C. It fails because the DELETE INPUToption can be used only with the BACKUP AS COPYcommand.
- D. It executed successfully and creates an image copy of the database along with archive log files and then deletes the original archived log files.
Answer: B
Explanation:
Explanation/Reference:
References: https://docs.oracle.com/cd/B13789_01/server.101/b10734/rcmbackp.htm
NEW QUESTION 142
Examine the query and its output executed In an RDBMS Instance:
Which three statements are true about the users (other than sys) in the output? (Choose three.)
- A. The C # # C_ADMIN user can perform the data guard operation with Data Guard Broker.
- B. The C # # B_ADMIN user can perform all backup and recovery operations using RMAN only.
- C. The C # # A_ADMIN user can perform wallet operations.
- D. The C # # D_ADMIN user can perform backup and recovery operations for Automatic Storage Management (ASM).
- E. The C # # B_ADMIN user can perform all backup and recovery operations using RMAN or SQL* Plus.
Answer: A,D,E
Explanation:
B: SYSDG administrative privilege has ability to perform Data Guard operations (including startup and shutdown) using Data Guard Broker or dgmgrl.
D: SYSASM
The new (introduced in 11g) SYSASM role to manage the ASM instance, variable extent sizes to reduce shared pool usage, and the ability of an instance to read from a specific disk of a diskgroup E (Not A): SYSDBA is like a role in the sense that it is granted, but SYSDBA is a special built-in privilege to allow the DBA full control over the database Incorrect:
Not C: SYSKM. SYSKM administrative privilege has ability to perform transparent data encryption wallet operations.
Note:
Use the V$PWFILE_USERS view to see the users who have been granted administrative privileges.
NEW QUESTION 143
Which three statements are true about space usage alerts? (Choose three.)
- A. Database alerts can provide warnings about low space availability at both tablespace and segment levels.
- B. A newly created locally managed tablespace is automatically assigned the default threshold values defined for a database.
- C. Alerts are not issued for locally managed tablespaces that are offline or in read-only mode.
- D. Alerts are issued only when the critical threshold for space available in a tablespace is breached.
- E. The sum of active extents and allocated user quotas is considered to compute space usage for an undo tablespace.
Answer: B,C,D
Explanation:
Explanation
References: https://docs.oracle.com/cd/B28359_01/server.111/b28310/schema001.htm#ADMIN10120
NEW QUESTION 144
A senior DBA asked you to execute the following command to improve performance:
SQL> ALTER TABLE subscribe log STORAGE (BUFFER_POOL recycle);
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?
- A. All the queries on the SUBSCRIBE_LOG table are rewritten to a materialized view.
- B. The keep pool is not configured.
- C. The data blocks in the SUBSCRIBE_LOG table are rarely accessed.
- D. Automatic Shared Memory Management is not enabled.
- E. Automatic Workarea Management is not configured.
Answer: C
Explanation:
The most of the rows in SUBSCRIBE_LOG table are accessed once a week.
NEW QUESTION 145
Which two statements are true about resumable space allocation? (Choose two.)
- A. Resumable space allocation does not apply when users exceed their assigned space quota in a tablespace.
- B. SELECTstatements that run out of temporary space for sort areas are candidates for resumable execution.
- C. Free space in a segment is automatically reclaimed when a resumable statement is suspended because of an out-of-space condition.
- D. A resumable statement can be suspended and resumed only once during a session.
- E. Resumable space allocation does not apply when a database instance uses asynchronous commit.
- F. A database-level LOGONtrigger can be used to automatically configure resumable statement settings for individual sessions.
Answer: B,F
Explanation:
Explanation
NEW QUESTION 146
Which three factors influence the optimizer's choice of an execution plan?
- A. object statistics in the data dictionary
- B. type of connection used to connect to database instance
- C. the optimizer_mode initialization parameter
- D. fixed baselines
- E. cardinality estimates
Answer: B,C,D
NEW QUESTION 147
Which two statements are true about the Automatic Database Diagnostic Monitor (ADDM)?
(Choose two.)
- A. The results of the ADDM analysis are stored in the Automatic Workload Repository (AWR)
- B. The ADDM analysis provides only diagnostics information but does not provide recommendations
- C. The ADDM requires at least four AWR snapshots for analysis
- D. The ADDM runs after each AWR snapshot is collected automatically by MMON
- E. The ADDM calls other advisors if required, but does not provide recommendations about the advisors
Answer: A,D
NEW QUESTION 148
Which two statements are true about the RMAN validate database command? (Choose two.)
- A. It can detect corrupt block change tracking files.
- B. It can detect corrupt pfiles.
- C. It can detect corrupt spfiles.
- D. It checks the database for intrablock corruptions.
- E. It checks the database for interblock corruptions.
Answer: C,D
Explanation:
Explanation
Block corruptions can be divided Into Interblock corruption and intrablock corruption. In intrablock corruption. th<< corruption occurs within the block itself and can be either physical or logical corruption. In interblock corruption, the corruption occurs between blocks and can only be logical corruption.
(key word) * The VALIDATE command checks for intrablock corruptions only. Only DBVERIFY and the ANALYZE statement detect Interblock corruption.
VALIDATE Command Output **> List of Control File and SPFILE.
File TYPE >>>>> SPFILE or Control File.
Status >>>>> OK if no corruption, or FAILED If block corruption is found.
Blocks Failing >>>>>> The number of blocks that fail the corruption check. These blocks are newly corrupt.
Blocks Examined >>>>>> Total number of blocks in the file.
Oracle' Database Backup and Recovery User's Guide
12c Release 1 (12.1) - 16 Validating Database Files and Backups
NEW QUESTION 149
For which three requirements would you use the Database Resource Manager? (Choose three.)
- A. specifying the maximum number of concurrent sessions allowed for a user
- B. limiting the CPU used per database call
- C. limiting the degree of parallelism of operations performed by user sessions in a consumer group
- D. specifying an idle time limit that applies to sessions that are idle and blocking other sessions
- E. specifying the amount of private space a session can allocate in the shared pool of the SGA.
Answer: A,C,D
Explanation:
References: http://docs.oracle.com/cd/B19306_01/server.102/b14231/dbrm.htm
NEW QUESTION 150
Which three statements are true when the listener handles connection requests to an
Oracle 12c database instance with multithreaded architecture enabled In UNIX?
- A. Each multithreaded Oracle process has an SCMN thread.
- B. The local listener may spawn a now process and have that new process create a thread
- C. The local listener may pass the request to an existing process which in turn will create a thread.
- D. Thread creation must be routed through a dispatcher process
- E. Each Oracle process runs an SCMN thread.
Answer: A,C,D
NEW QUESTION 151
......
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