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Code d'Examen: 1Z0-820
Nom d'Examen: Oracle (Upgrade to Oracle Solaris 11 System Administrator)
Questions et réponses: 75 Q&As
Code d'Examen: 1z0-482
Nom d'Examen: Oracle (Oracle Data Integrator 11g Certified Implementation Essentials)
Questions et réponses: 71 Q&As
Code d'Examen: 1Z0-060
Nom d'Examen: Oracle (Upgrade to Oracle Database 12c)
Questions et réponses: 150 Q&As
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NO.1 Which Oracle Database component is audited by default if the unified Auditing option is
enabled?
A. Oracle Data Pump
B. Oracle Recovery Manager (RMAN)
C. Oracle Label Security
D. Oracle Database Vault
E. Oracle Real Application Security
Answer: E
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Explanation:
Type ofUnifiedauditing:
Standard
Fine Grained Audit
XS
Database Vault(not D)
Label Security(not C)
RMAN AUDIT(not B)
Data Pump(not A)
Note:
*Oracle 12c introduces Unified Auditing, which consolidates database audit records
including :-
DDL, DML, DCL
Fine Grained Auditing (DBMS_FGA)
Oracle Database Real Application Security
Oracle Recovery Manager
Oracle Database Vault
Oracle Label Security
Oracle Data Mining
Oracle Data Pump
Oracle SQL*Loader Direct Load
NO.2 In your multitenant container database (CDB) containing pluggable databases (PDB), users
complain about performance degradation.
How does real-time Automatic database Diagnostic Monitor (ADDM) check performance
degradation and provide solutions?
A. It collects data from SGA and compares it with a preserved snapshot.
B. It collects data from SGA, analyzes it, and provides a report.
C. It collects data from SGA and compares it with the latest snapshot.
D. It collects data from both SGA and PGA, analyzes it, and provides a report.
Answer: B
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Explanation:
Note: *The multitenant architecture enables an Oracle database to function as a multitenant
container database (CDB) that includes zero, one, or many customer-created pluggable databases
(PDBs). A PDB is a portable collection of schemas, schema objects, and nonschema objects that
appears to an Oracle Net client as a non-CDB. All Oracle databases before Oracle Database 12c were
non-CDBs. *The System Global Area (SGA) is a group of shared memory areas that are dedicated to
an Oracle "instance" (an instance is your database programs and RAM).
*The PGA (Program or Process Global Area) is a memory area (RAM) that stores data and control
information for a single process.
NO.3 You notice that the performance of your production 24 /7 Oracle database significantly
degraded. Sometimes you are not able to connect to the instance because it hangs. You do not want
to restart the database instance.
How can you detect the cause of the degraded performance?
A. Enable Memory Access Mode, which reads performance data from SGA.
B. Use emergency monitoring to fetch data directly from SGA analysis.
C. Run Automatic Database Diagnostic Monitor (ADDM) to fetch information from the latest
Automatic Workload Repository (AWR) snapshots.
D. Use Active Session History (ASH) data and hang analysis in regular performance monitoring.
E. Run ADDM in diagnostic mode.
Answer: C
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Explanation:
*In most cases, ADDM output should be the first place that a DBA looks when notified of a
performance problem. *Performance degradation of the database occurs when your database was
performing optimally in the past, such as 6 months ago, but has gradually degraded to a point
where it becomes noticeable to the users. The Automatic Workload Repository (AWR) Compare
Periods report enables you to compare database performance between two periods of time.
While an AWR report shows AWR data between two snapshots (or two points in time), the AWR
Compare Periods report shows the difference between two periods (or two AWR reports with a
total of four snapshots). Using the AWR Compare Periods report helps you to identify detailed
performance attributes and configuration settings that differ between two time periods.
Reference:Resolving Performance Degradation Over Time
NO.4 Your multitenant container (CDB) contains two pluggable databases(PDB), HR_PDB and
ACCOUNTS_PDB, both of which use the CDB tablespace. The temp file is called temp01.tmp.
A user issues a query on a table on one of the PDBs and receives the following error:
ERROR at line 1:
ORA-01565: error in identifying file '/u01 /app/oracle/oradata/CDB1 /temp01.tmp'
ORA-27037: unable to obtain file status
Identify two ways to rectify the error.
A. Add a new temp file to the temporary tablespace and drop the temp file that that produced the
error.
B. Shut down the database instance, restore the temp01.tmp file from the backup, and then restart
the database.
C. Take the temporary tablespace offline, recover the missing temp file by applying redo logs, and
then bring the temporary tablespace online.
D. Shutdown the database instance, restore and recover the temp file from the backup, and then
open the database with RESETLOGS.
E. Shut down the database instance and then restart the CDB and PDBs.
Answer: C,E
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Explanation:
* Because temp files cannot be backed up and because no redo is ever generated for them, RMAN
never restores or recovers temp files. RMAN does track the names of temp files, but only so that it
can automatically re-create them when needed.
*If you use RMAN in a Data Guard environment, then RMAN transparently converts primary control
files to standby control files and vice versa. RMAN automatically updates file names for data files,
online redo logs, standby redo logs, and temp files when you issue RESTORE and RECOVER.
NO.5 Which statement is true about Oracle Net Listener?
A. It acts as the listening endpoint for the Oracle database instance for all local and non-local user
connections.
B. A single listener can service only one database instance and multiple remote client connections.
C. Service registration with the listener is performed by the process monitor (PMON) process of
each database instance.
D. The listener.ora configuration file must be configured with one or more listening protocol
addresses to allow remote users to connect to a database instance.
E. The listener.ora configuration file must be located in the ORACLE_HOME/network/admin directly.
Answer: C
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Explanation:
Supported services, that is, the services to which the listener forwards client
requests, can be configured in the listener.ora file or this information can be dynamically
registered with the listener. This dynamic registration feature is called service registration.
The registration is performed by the PMON process-an instance background process-of
each database instance that has the necessary configuration in the database initialization
parameter file. Dynamic service registration does not require any configuration in the
listener.ora file.
Incorrect:
Not B:Service registration reduces the need for the SID_LIST_listener_name parameter
setting, which specifies information about the databases served by the listener, in the
listener.ora file.
Note:
*Oracle Net Listener is a separate process that runs on the database server computer. It
receives incoming client connection requests and manages the traffic of these requests to
the database server.
*A remote listener is a listener residing on one computer that redirects connections to a
database instance on another computer. Remote listeners are typically used in an Oracle
Real Application Clusters (Oracle RAC) environment. You can configure registration to
remote listeners, such as in the case of Oracle RAC, for dedicated server or shared server
environments.
NO.6 Your multitenant container database, CDB1, is running in ARCHIVELOG mode and has two
pluggable databases, HR_PDB and ACCOUNTS_PDB. An RMAN backup exists for the database.
You issue the command to open ACCOUNTS_PDB and find that the USERDATA.DBF data file for the
default permanent tablespace USERDATA belonging to ACCOUNTS_PDB is corrupted.
What should you do before executing the commands to restore and recover the data file in
ACCOUNTS_PDB?
A. Place CDB1 in the mount stage and then the USERDATA tablespace offline in ACCOUNTS_PDB.
B. Place CDB1 in the mount stage and issue the ALTER PLUGGABLE DATABASE accounts_pdb CLOSE
IMMEDIATE command.
C. Issue the ALTER PLUGGABLE DATABASE accounts_pdb RESTRICTED command.
D. Take the USERDATA tablespace offlineinACCOUNTS_PDB.
Answer: D
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Explanation:
*You can take an online tablespace offline so that it is temporarily unavailable for general use. The
rest of the database remains open and available for users to access data. Conversely, you can bring
an offline tablespace online to make the schema objects within the tablespace available to database
users. The database must be open to alter the availability of a tablespace.
NO.7 You plan to use the In Database Archiving feature of Oracle Database 12c, and store rows that
are inactive for over three months, in Hybrid Columnar Compressed (HCC) format.
Which three storage options support the use of HCC?
A. ASM disk groups with ASM disks consisting of Exadata Grid Disks.
B. ASM disk groups with ASM disks consisting of LUNS on any Storage Area Network array
C. ASM disk groups with ASM disks consisting of any zero padded NFS-mounted files
D. Database files stored in ZFS and accessed using conventional NFS mounts.
E. Database files stored in ZFS and accessed using the Oracle Direct NFS feature
F. Database files stored in any file system and accessed using the Oracle Direct NFS feature
G. ASM disk groups with ASM disks consisting of LUNs on Pillar Axiom Storage arrays
Answer: A,E,G
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Explanation:
HCC requires the use of Oracle Storage - Exadata(A), Pillar Axiom(G)or Sun ZFS Storage Appliance
(ZFSSA).
Note: *Hybrid Columnar Compression, initially only available on Exadata, has been extended to
supportPillar Axiom and Sun ZFS Storage Appliance (ZFSSA) storage when used with Oracle
Database Enterprise Edition 11.2.0.3 and above *Oracle offers the ability to manage NFS using a
feature called Oracle Direct NFS (dNFS). Oracle Direct NFS implements NFS V3 protocol within the
Oracle database kernel itself. Oracle Direct NFS client overcomes many of the challenges associated
with using NFS with the Oracle Database with simple configuration, betterperformance than
traditional NFS clients, and offers consistent configuration across platforms.
NO.8 Examine the followingcommands forredefininga table withVirtual Private Database(VPD)
policies:
Which two statements are true about redefining the table?
A. All the triggers for the table are disabled without changing any of the column names or column
types in the table.
B. The primary key constraint on the EMPLOYEES table is disabled during redefinition.
C. VPD policies are copied from the original table to the new table during online redefinition.
D. You must copy the VPD policies manually from the original table to the new table during online
redefinition.
Answer: B,C
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Explanation:
C (not D):CONS_VPD_AUTO Used to indicate to copy VPD policies automatically
*DBMS_RLS.ADD_POLICY /The DBMS_RLS package contains the fine-grained access control
administrative interface, which is used to implement Virtual Private Database (VPD).DBMS_RLS is
available with the Enterprise Edition only.
Note: *CONS_USE_PK and CONS_USE_ROWID are constants used as input to the "options_flag"
parameter in both the START_REDEF_TABLE Procedure and CAN_REDEF_TABLE Procedure.
CONS_USE_ROWID is used to indicate that the redefinition should be done using rowids while
CONS_USE_PK implies that the redefinition should be done using primary keys or pseudo-primary
keys (which are unique keys with all component columns having NOT NULL constraints).
*DBMS_REDEFINITION.START_REDEF_TABLE
To achieve online redefinition, incrementally maintainable local materialized views are used. These
logs keep track of the changes to the master tables and are used by the materialized views during
refresh synchronization.
*START_REDEF_TABLE Procedure Prior to calling this procedure, you must manually create an empty
interim table (in the same schema as the table to be redefined) with the desired attributes of the
post-redefinition table, and then call this procedure to initiate the redefinition.
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