(2023) 1z0-062 Exam Dumps, Practice Test Questions BUNDLE PACK
Oracle Database Certification 1z0-062 Sample Questions Reliable
Oracle 1Z0-062 Dumps
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The Oracle 1Z0-062 is one of the two certification exams that you need to pass in order to get the Oracle Database 12c Administrator Certified Associate certificate. The second test is 1Z0-071. The target audience for this exam is those individuals who want to prove their skills in fundamental database terminologies and concepts to guide vital functions for businesses, processes, and systems.
NEW QUESTION 138
Which three file types are stored in the Fast Recovery Area by default in a traditional nonOMF file system?
(Choose three.)
- A. Flashback logs
- B. multiplexed copies of the current control file
- C. online redo log files
- D. parameter file
- E. archived log files
- F. Flashback Data Archive files
Answer: A,C,E
NEW QUESTION 139
You find this query being used in your Oracle 12c database:
Which method a used by the optimizer to limit the rows being returned?
- A. A TOP-N query is created to limit the rows to 20 percent of the total rows
- B. A view is created during execution and a filter on the view limits the rows to 20 percent of the total rows.
- C. All the rows are returned to the client or middle tier but only the first 20 percent are returned to the screen or the
application. - D. A filter is added to the table query dynamically using ROWNUM to limit the rows to 20 percent of the total rows
Answer: B
NEW QUESTION 140
Examine the following command:
CREATE TABLE (prod_id number(4),
Prod_name varchar2 (20),
Category_id number(30),
Quantity_on_hand number (3) INVISIBLE);
Which three statements are true about using an invisible column in the PRODUCTS table?
(Choose three.)
- A. Referential integrity constraint cannot be set on the invisible column.
- B. A primary key constraint can be added on the invisible column.
- C. The invisible column cannot be made visible and can only be marked as unused.
- D. The %ROWTYPE attribute declarations in PL/SQL to access a row will not display the invisible column in the output.
- E. The DESCRIBE commands in SQL *Plus will not display the invisible column in the output.
Answer: B,D,E
Explanation:
AB: You can make individual table columns invisible. Any generic access of a table does not show the invisible columns in the table. For example, the following operations do not display invisible columns in the output:
* SELECT * FROM statements in SQL
* DESCRIBE commands in SQL*Plus
* %ROWTYPE attribute declarations in PL/SQL
* Describes in Oracle Call Interface (OCI)
Incorrect:
Not D: You can make invisible columns visible.
You can make a column invisible during table creation or when you add a column to a table, and you can later alter the table to make the same column visible.
References:
NEW QUESTION 141
You conned using SQL Plus to the root container of a multitenant container database (CDB) with SYSDBA privilege.
The CDB has several pluggable databases (PDBs) open in the read/write mode.
There are ongoing transactions in both the CDB and PDBs.
What happens alter issuing the SHUTDOWN TRANSACTIONAL statement?
- A. The shutdown proceeds as soon as all transactions in both the CDB and PDBs are either committed or rolled back.
- B. The statement results in an error because there are open PDBs.
- C. The shutdown proceeds as soon as all transactions in the CDB are either committed or rolled back.
- D. The shutdown proceeds immediately. The shutdown proceeds as soon as all transactions in the PDBs are either
committed or rolled hack.
Answer: C
Explanation:
* SHUTDOWN [ABORT | IMMEDIATE | NORMAL | TRANSACTIONAL [LOCAL]]
Shuts down a currently running Oracle Database instance, optionally closing and dismounting a database. If the
current database is a pluggable database, only the pluggable database is closed. The consolidated instance continues
to run.
Shutdown commands that wait for current calls to complete or users to disconnect such as SHUTDOWN NORMAL and
SHUTDOWN TRANSACTIONAL have a time limit that the SHUTDOWN command will wait. If all events blocking the
shutdown have not occurred within the time limit, the shutdown command cancels with the following message:
ORA-01013: user requested cancel of current operation
* If logged into a CDB, shutdown closes the CDB instance.
To shutdown a CDB or non CDB, you must be connected to the CDB or non CDB instance that you want to close, and
then enter
SHUTDOWN
Database closed.
Database dismounted.
Oracle instance shut down.
To shutdown a PDB, you must log into the PDB to issue the SHUTDOWN command.
SHUTDOWN
Pluggable Database closed.
Note:
* Prerequisites for PDB Shutdown
When the current container is a pluggable database (PDB), the SHUTDOWN command can only be used if:
The current user has SYSDBA, SYSOPER, SYSBACKUP, or SYSDG system privilege.
The privilege is either commonly granted or locally granted in the PDB.
The current user exercises the privilege using AS SYSDBA, AS SYSOPER, AS SYSBACKUP, or AS SYSDG at connect time.
To close a PDB, the PDB must be open.
NEW QUESTION 142
Which two options can be configured for an existing database by using the Database Configuration Assistant (DBCA)? (Choose two.)
- A. Nondefault blocksize tablespaces
- B. Database Vault in ORACLE_HOME
- C. Database Resident Connection Pooling
- D. Oracle Suggested Backup Strategy
- E. Configure Label Security
Answer: B,E
NEW QUESTION 143
Identify two prerequisites for configuring Enterprise Manager Database Express (EM Express).
- A. Use the DBMS_XDB_CONFIG.SETHTTPPORT procedure to configure a port number for Oracle HTTP Server.
- B. Install Oracle HTTP Server.
- C. Grant the APEX_PUBLIC_USER role to the SYSMAN user.
- D. Configure at least one dispatcher for the TCP/IP protocol.
- E. Create a SYSMAN user with the SYSDBA privilege as an administrator for EM Express.
Answer: A,D
NEW QUESTION 144
Which three statements are true concerning unplugging a pluggable database (PDB)?
- A. The PDB must be open in read only mode.
- B. The unplugged PDB can be plugged into the same multitenant container database (CDB)
- C. The PDB must be dosed.
- D. The unplugged PDB becomes a non-CDB.
- E. The PDB data files are automatically removed from disk.
- F. The unplugged PDB can be plugged into another CDB.
Answer: B,C,F
Explanation:
B, not A: The PDB must be closed before unplugging it.
D: An unplugged PDB contains data dictionary tables, and some of the columns in these encode information in an endianness-sensitive way. There is no supported way to handle the conversion of such columns automatically. This means, quite simply, that an unplugged PDB cannot be moved across an endianness difference.
E (not F): To exploit the new unplug/plug paradigm for patching the Oracle version most effectively, the source and destination CDBs should share a filesystem so that the PDB's datafiles can remain in place.
Reference: Oracle White Paper, Oracle Multitenant
NEW QUESTION 145
Examine the parameters for your database instance:
Which three statements are true about the process of automatic optimization by using cardinality feedback? (Choose three.)
- A. The optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.
- B. After the optimizer identifies a query as a re-optimization candidate, statistics collected by the collectors are submitted to the optimizer.
- C. The optimizer automatically changes a plan during subsequent execution of a SQL statement if there is a huge difference in optimizer estimates and execution statistics.
- D. The optimizer can re optimize a query only once using cardinality feedback.
- E. The optimizer enables monitoring for cardinality feedback after the first execution of a query.
Answer: A,C,E
Explanation:
Explanation/Reference:
Explanation:
C: During the first execution of a SQL statement, an execution plan is generated as usual.
D: if multi-column statistics are not present for the relevant combination of columns, the optimizer can fall back on cardinality feedback.
(not B)* Cardinality feedback. This feature, enabled by default in 11.2, is intended to improve plans for repeated executions.
optimizer_dynamic_sampling
optimizer_features_enable
* dynamic sampling or multi-column statistics allow the optimizer to more accurately estimate selectivity of conjunctive predicates.
Note:
* OPTIMIZER_DYNAMIC_SAMPLING controls the level of dynamic sampling performed by the optimizer.
Range of values. 0 to 10
* Cardinality feedback was introduced in Oracle Database 11gR2. The purpose of this feature is to automatically improve plans for queries that are executed repeatedly, for which the optimizer does not estimate cardinalities in the plan properly. The optimizer may misestimate cardinalities for a variety of reasons, such as missing or inaccurate statistics, or complex predicates. Whatever the reason for the misestimate, cardinality feedback may be able to help.
NEW QUESTION 146
Examine the parameters for your database instance:
You execute the following command:
SQL> ALTER TABLESPACE undotbs1 RETENTION NOGUARANTEE;
Which statement is true in this scenario?
- A. An attempt is made to keep inactive undo for 1200 seconds but transactions may overwrite the undo before that time has elapsed.
- B. Undo data is written to flashback logs after 1200 seconds.
- C. Inactive undo data is retained for 1200 seconds even if subsequent transactions fail due to lack of space in the undo tablespace.
- D. You can perform a Flashback Database operation only within the duration of 1200 seconds.
Answer: A
NEW QUESTION 147
You install "Oracle Grid Infrastructure for a standalone server" on a host on which the ORCL1and ORCL2 databases both have their instances running.
Which two statements are true? (Choose two.)
- A. The crsctl start hascommand must be used to start software services for Oracle Automatic Storage Management (ASM) after the "Oracle Grid Infrastructure for a standalone server" installation is complete.
- B. The srvctl add databasecommand must be used to add ORCL1and ORCL2to the ORACLE Restart configuration.
- C. All databases subsequently created by using the Database Configuration Assistant (DBCA) are automatically added to the Oracle Restart configuration.
- D. All database listeners running from the database home are automatically added to the Oracle Restart configuration.
- E. Both ORCL1and ORCL2are automatically added to the Oracle Restart configuration.
Answer: B,D
NEW QUESTION 148
Identify three scenarios in which you would recommend the use of SQL Performance Analyzer to analyze impact on the performance of SQL statements. (Choose three.)
- A. Change in the Oracle Database version
- B. Migration of database storage from non-ASM to ASM storage
- C. Database and operating system upgrade
- D. Change in your network infrastructure
- E. Change in the hardware configuration of the database server
Answer: A,C,E
Explanation:
Oracle 11g/12c makes further use of SQL tuning sets with the SQL Performance Analyzer, which compares the performance of the statements in a tuning set before and after a database change. The database change can be as major or minor as you like, such as:
* (E) Database, operating system, or hardware upgrades.
* (A,C) Database, operating system, or hardware configuration changes.
* Database initialization parameter changes.
* Schema changes, such as adding indexes or materialized views.
* Refreshing optimizer statistics.
* Creating or changing SQL profiles.
NEW QUESTION 149
In your multitenant container database (CDB) containing pluggable database (PDBs), you granted the CREATE TABLE privilege to the common user C # # A_ADMIN in root and all
PDBs. You execute the following command from the root container:
SQL > REVOKE create table FROM C # # A_ADMIN;
What is the result?
- A. It fails and reports an error because the CONTAINER=CURRENT clause is not used.
- B. It fails and reports an error because the CONTAINER=ALL clause is not used.
- C. It executes successfully and the CREATE TABLE privilege is revoked from C # #
A_ADMIN in root only. - D. It excludes successfully and the CREATE TABLE privilege is revoked from C # #
A_ADMIN in root and all PDBs. - E. It executes successfully and the CREATE TABLE privilege is revoked from C # #
A_ADMIN in all PDBs.
Answer: C
Explanation:
REVOKE ..FROM
If the current container is theroot:
/ Specify CONTAINER = CURRENT to revoke a locally granted system privilege, object privilege, or role from a common user or common role. The privilege or role is revoked from the user or role only in the root. This clause does not revoke privilegesgranted with
CONTAINER = ALL.
/ Specify CONTAINER = ALL to revoke a commonly granted system privilege, object privilege on a common object, or role from a common user or common role. The privilege or role is revoked from the user or role across the entireCDB. This clause can revoke only a privilege or role granted with CONTAINER = ALL from the specified common user or common role. This clause does not revoke privileges granted locally with CONTAINER =
CURRENT. However, any locally granted privileges thatdepend on the commonly granted privilege being revoked are also revoked.
If you omit this clause, then CONTAINER = CURRENT is the default.
References:
NEW QUESTION 150
Which task would you recommend before using the Database Upgrade Assistant (DBUA) to upgrade a single-instance Oracle 11g R2 database to Oracle Database 12c?
- A. executing the catctl.pl script to run the upgrade processes in parallel
- B. shutting down the database instance that is being upgraded
- C. copying the listener.ora file to the new ORACLE_HOME
- D. running the Pre-Upgrade Information Tool
Answer: D
Explanation:
Explanation
References:
http://docs.oracle.com/cd/E11882_01/server.112/e23633/upgrade.htm#UPGRD12395
NEW QUESTION 151
Which two statements are true about the Oracle Direct Network File system (DNFS)? (Choose two.)
- A. Direct NFS can load-balance I/O traffic across multiple network adapters.
- B. A traditional NFS mount is not required when using Direct NFS.
- C. Direct NFS is available only in UNIX platforms.
- D. Oracle Disk Manager can manage NFS on its own, without using the operating kernel NFS driver.
- E. It utilizes the OS file system cache.
Answer: A,D
Explanation:
Explanation/Reference:
Explanation:
E: Performance is improved by load balancing across multiple network interfaces (if available).
Note:
* To enable Direct NFS Client, you must replace the standard Oracle Disk Manager (ODM) library with one that supports Direct NFS Client.
Incorrect:
Not A: Direct NFS Client is capable of performing concurrent direct I/O, which bypasses any operating system level caches and eliminates any operating system write-ordering locks Not B:
* To use Direct NFS Client, the NFS file systems must first be mounted and available over regular NFS mounts.
* Oracle Direct NFS (dNFS) is an optimized NFS (Network File System) client that provides faster and more scalable access to NFS storage located on NAS storage devices (accessible over TCP/IP).
Not D: Direct NFS is provided as part of the database kernel, and is thus available on all supported database platforms - even those that don't support NFS natively, like Windows.
Note:
* Oracle Direct NFS (dNFS) is an optimized NFS (Network File System) client that provides faster and more scalable access to NFS storage located on NAS storage devices (accessible over TCP/IP). Direct NFS is built directly into the database kernel - just like ASM which is mainly used when using DAS or SAN storage.
* Oracle Direct NFS (dNFS) is an internal I/O layer that provides faster access to large NFS files than traditional NFS clients.
NEW QUESTION 152
Examine the details of the Top 5 Timed Events in the following Automatic Workloads Repository (AWR) report:
What are three possible causes for the latch-related wait events?
- A. The buffers are being read into the buffer cache, but some other session is changing the buffers.
- B. A large number COMMITS are being performed.
- C. The size of the shared pool is too small.
- D. There are frequent logons and logoffs.
- E. Cursors are not being shared.
Answer: A,C,E
Explanation:
Explanation/Reference:
Explanation:
https://logicalread.com/oracle-latch-free-wait-dr01/#.WQygk1i6zUI
NEW QUESTION 153
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. Change thedumpfileoption [email protected].
- B. Replace thedumpfileoption withnetwork_1ink = devdb.us.oracle.com.
- C. Addnetwork_link = devdb.us.oracle.com.
- D. Replace theschemasoption withnetwork_1ink = devdb.us.oracle.com.
- E. Add theSYSTEMuser to theschemasoption.
Answer: B
NEW QUESTION 154
Which two statements are true about the RMAN validate database command?
- A. It can detect corrupt pfiles.
- B. It can detect corrupt block change tracking files.
- C. It checks the database for intrablock corruptions.
- D. It checks the database for interblock corruptions.
- E. It can detect corrupt spfiles.
Answer: C,E
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 155
Which three operations can be performed as multipartition operations in Oracle? (Choose three.)
- A. Merge partitions of a list partitioned table
- B. Move partitions of a range-partitioned table
- C. Merge partitions of a reference partitioned index
- D. Coalesce partitions of a hash-partitioned global index.
- E. Drop partitions of a list partitioned table
- F. Rename partitions of a range partitioned table
Answer: A,C,E
Explanation:
Explanation
Multipartition maintenance enables adding, dropping, truncate, merge, split operations on multiple partitions.
A: Merge Multiple Partitions:
The new "ALTER TABLE ... MERGE PARTITIONS " help merge multiple partitions or subpartitions with a single statement. When merging multiple partitions, local and global index operations and semantics for inheritance of unspecified physical attributes are the same for merging two partitions.
B: Drop Multiple Partitions:
The new "ALTER TABLE ... DROP PARTITIONS " help drop multiple partitions or subpartitions with a single statement.
Example:
view plaincopy to clipboardprint?
SQL> ALTER TABLE Tab_tst1 DROP PARTITIONS
Tab_tst1_PART5, Tab_tst1_PART6, Tab_tst1_PART7;
Table altered
SQL>
Restrictions :
- You can't drop all partitions of the table.
- If the table has a single partition, you will get the error: ORA-14083: cannot drop the only partition of a partitioned.
NEW QUESTION 156
Examine the parameter settings in your local ORCL database:
Examine the parameter settings for the remote SALES database:
As the SYS user, you issue the following command on ORCL:
CREATE PUBLIC DATABASE LINK sales.us.example.com USING 'sales1';
The sales1 tnsnames entry points to the sales database instance.
Which two are requirements to ensure that you can successfully connect by using this database link? (Choose two.)
- A. The SALES1 net service name should be known to both the local and remote databases.
- B. The REMOTE_OS_AUTHENT initialization parameter should be set to FALSE in the remote database.
- C. Only the user creating the database link must have an account and the required privileges in the remote database.
- D. Local database users who use this database link should have accounts and the required privileges in the remote database.
- E. The GLOBAL_NAMES initialization parameter should be set to FALSE in the ORCL database.
Answer: D,E
NEW QUESTION 157
You execute the commands:
Which two statements are true?
- A. The userSidneycan connect to the database instance but cannot perform sort operations because no space quota is specified for thetemptablespace.
- B. The userSidneycan connect to the database instance but requires relevant privileges to create objects in theuserstablespace.
- C. The userSidneyis created but cannot connect to the database instance because no profile is default.
- D. The userSidneyis created and authenticated by the operating system.
- E. Thecreate usercommand fails if any role with the name Sidney exists in the database.
Answer: B,E
Explanation:
References:
NEW QUESTION 158
......
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