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質問 # 52
Examine this configuration:
1. CDB1 is a container database.
2. PDB1 and PDB2 are pluggable databases in CDB1.
You execute these commands successfully:
Which two are true?
- A. PDB$SEED is in read only state.
- B. PDB1 and PDB2 are in read only state.
- C. Redo logs are opened.
- D. CDB$ROOT is in mount state.
- E. PDB1 and PDB2 are in mount state.
正解：C、D
質問 # 53
You plan to install Oracle Grid Infrastructure for a Standalone Server and Oracle Database for the first time on a server.
Examine this command and its outcome:
Which two are true? (Choose two.)
- A. oracle must be the owner of every Oracle Database installation.
- B. oracle will be an owner of the Oracle Inventory.
- C. The user account, oracle, and group, oinstall, can be used for all Oracle software installations.
- D. oracle can own an Oracle Database installation but not an Oracle Grid Infrastructure installation.
- E. oracle will be granted the SYSASM privilege when installing the Oracle Database software.
正解：B、C
質問 # 54
Choose two. Which two are true about Oracle Grid Infrastructure for a Standalone Server?
- A. It supports volume management, file system, and automatic restart capabilities.
- B. It can manage database resources on the server where it is installed or on a different server.
- C. The CSS daemon runs from the Grid Infrastructure home.
- D. It must be installed before the Oracle database software is installed.
- E. It requires Oracle Automatic Storage Management (ASM) components to be installed separately.
正解：A、D
質問 # 55
A schema owner truncated a table in error and must recover the data.
Which Oracle Flashback feature could be used to recover the data?
- A. FLASHBACK TABLE
- B. FLASHBACK DATABASE
- C. FLASHBACK DATA ARCHIVE
- D. FLASHBACK VERSION QUERY
- E. FLASHBACK TRANSACTION
正解：B
解説：
Backup and Recovery Workshop - typical scenario for Flashback Database is truncate table.
You may use FBDA but in different way (not flashing back):
insert into t1_recovered
select * from t1
as of timestamp sysdate - 1/24;
質問 # 56
Which three are true about opatchauto?
- A. Patchsets are applied via opatchauto.
- B. It performs a shutdown and then a restart of all processes in both Oracle Grid Infrastructure and Oracle Database home during the patching process.
- C. It Is used to apply interim patches to Oracle Grid Infrastructure and Oracle Database home combinations.
- D. It requires the Oracle Grid Infrastructure and Oracle Database instances to be shut down before being invoked.
- E. It must be invoked by a user with root user privileges.
- F. It applies patches in nonrolling mode by default.
- G. Users must always input patch plans to opatchauto.
正解：A、D、F
質問 # 57
Oracle Managed Files (OMF) is enabled in a CDB and this command is successfully executed:
Which three are true? (Choose three.)
- A. An application seed PDB is created for APP1.
- B. Application PDBs that are subsequently created in the APP1 application container will be cloned from PDB$SEED.
- C. Application PDBs that are subsequently created in the APP1 application container will be cloned from APP1$SEED.
- D. APP1 can never be unplugged.
- E. A default service is created for the application root APP1.
- F. An application root PDB is created for APP1.
正解：A、B、C
質問 # 58
Which three are true about block media recovery? (Choose three.)
- A. The data file containing the block being recovered remains online.
- B. It can be performed on noncorrupt blocks.
- C. A block being recovered is not accessible.
- D. It cannot repair logical corruption.
- E. To use it, Flashback Database must be enabled.
- F. The target database for which one or more blocks are to be recovered must be in the OPEN state.
正解：A、C、E
解説：
https://docs.oracle.com/en/database/oracle/oracle-database/19/bradv/rman-block-media- recovery.html#GUID-C1164158-496C-4D8A-8A06-D343935FC3B9 It tells that flashback is a must "Flashback Database must be enabled on the target database for RMAN to search the flashback logs for good copies of corrupt blocks." It also says "Block media recovery may not be able to repair all logical block corruptions. In these cases, alternate recovery methods, such as tablespace point-in-time recovery, or dropping and re-creating the affected objects, may repair the corruption."
質問 # 59
Which two are true about Oracle Flashback features? (Choose two.)
- A. FLASHBACK TABLE can undrop a column.
- B. FLASHBACK DROP can undrop an index when undropping a table.
- C. FLASHBACK QUERY can retrieve REDO records from ONLINE and ARCHIVED REDO LOG files.
- D. FLASHBACK VERSION QUERY can retrieve REDO records from ONLINE and ARCHIVED REDO LOG files.
- E. After a database is restored from flashback logs using the FLASHBACK DATABASE command, it is sometimes rolled forward using redo logs.
正解：C、D
質問 # 60
In your Database, the TBS PERCENT USED parameter is set to 60 and the TBS PERCENT FREE parameter is set to 20. Which two storage-tiering actions might be automated when using information Lifecycle Management (ILM) to automate data movement?
- A. The movement of all segments to a target tablespace with a higher degree of compression, on a different storage tier, when the source tablespace exceeds TBS PERCENT USED
- B. Setting the target tablespace offline
- C. The movement of some blocks to a target tablespace with a lower degree of compression, on a different storage tier, when the source tablespace exceeds TBS PERCENT USED Correct
- D. The movement of some segments to a target tablespace with a higher degree of compression, on a different storage tier, when the source tablespace exceeds TBS PERCENT USED
- E. Settingthetargettablespacetoread-only
正解：D、E
質問 # 61
Which three are true about Automatic Workload Repository (AWR) snapshots?
- A. They can be retained forever.
- B. They are generated if STATISTICS_LEVEL is set to BASIC.
- C. They are always created automatically.
- D. They are always created manually.
- E. They are generated if STATISTICS_LEVEL is set to ALL.
- F. They are generated if STATISTICS_LEVEL is set to TYPICAL.
正解：C、E、F
質問 # 62
A database is configured in ARCHIVELOGmode.
A full RMAN backup exists but no control file backup to trace has been taken.
A media failure has occurred.
In which two scenarios is incomplete recovery required? (Choose two.)
- A. after losing a SYSAUXtablespace data file
- B. after losing all copies of the control file
- C. after losing an UNDOtablespace that is in use
- D. after losing all members of the CURRENTonline redo log group
- E. after losing all members of an INACTIVE online redo log group
正解：B、E
質問 # 63
Choose two. Which two are true about various Oracle security and auditing capabilities?
- A. Application-common TSDP policies are always container specific.
- B. Application-common OLS policies can be created only if all the PDBs in the application container are closed.
- C. Application-common Transparent Security Data Protection (TSDP) policies can be created only if all the PDBs in the application container are closed.
- D. Fine-grained auditing (FGA) policies in an application root are automatically synchronized to all application PDBs contained in the application container when they are updated.
- E. Unified auditing can be automatically synchronized to all application PDBs in an application container.
正解：D、E
質問 # 64
The users tablespace consists of data files 3 and 4 and must always be online in read/write mode. Which two are true about using RMAN to perform an open database back up of this tablespace?
- A. Backups can be done incrementally.
- B. Backups must be done incrementally.
- C. Backups can be taken only if the database is in archivelog mode.
- D. Backups must be contained in backup sets.
- E. The database must be registered in an RMAN catalog.
- F. Only consistent backups can be created.
正解：A、C
質問 # 65
Which two statements are true when row archival management is enabled?
- A. The ROW ARCHIVAL VISIBILITY session parameter defaults to active rows only.
- B. The ORA_ARCHIVE_STATE column is updated automatically by the Oracle Server based on activity tracking columns, to Indicate that a row is no longer considered active. Correct
- C. The ORA_ARCHIVE_STATE column is visible if referenced in the select list of a query.
- D. The ORA_ARCHIVE_STATE column visibility is controlled by the ROW ARCHIVAL VISIBILITY session parameter.
- E. The ORA_ARCHIVE_STATE column is updated manually or by a program that could reference activity tracking columns, to indicate that a row is no longer considered active.
正解：C、E
質問 # 66
Which two are true about various Oracle security and auditing capabilities?
- A. Application-common TSDP policies are always container specific.
- B. Application-common OLS policies can be created only if all the PDBs in the application container are closed.
- C. Application-common Transparent Security Data Protection (TSDP) policies can be created only if all the PDBs in the application container are closed.
- D. Fine-grained auditing (FGA) policies in an application root are automatically synchronized to all application PDBs contained in the application container when they are updated.
- E. Unified auditing can be automatically synchronized to all application PDBs in an application container.
正解：D、E
質問 # 67
Choose two. Which two are true about memory advisors?
- A. If Automatic Memory Management is enabled, no memory advisors are available.
- B. If Automatic Memory Management is enabled, the Shared Pool Advisor and Buffer Cache Advisor are available to set the maximum size for these individual System Global Area components.
- C. If Manual Shared Memory Management is enabled, only the Shared Pool Advisor and Buffer Cache Advisor are available.
- D. All memory advisors use data from Automatic Workload Repository.
- E. If Automatic Shared Memory Management is enabled, both the SGA Advisor and PGA Advisor are always available.
正解：D、E
質問 # 68
Which two are true about the Oracle Optimizer?
- A. It always generates an index access operation when a statement filters on an indexed column with an equality operator.
- B. It requires system statistics when generating SQL execution plans.
- C. It can automatically re-optimize execution plans that were detected to be sub-optimal when executing.
- D. It can re-write a statement internally in order to generate a more optimal plan.
- E. It ignores stale object statistics in the Data Dictionary.
正解：C、D
質問 # 69
While backing up to the Oracle Fast Recovery Area (FRA), you determined the backup is taking too long and suspect a performance bottleneck.
Which three are true about diagnosing and tuning these problems? (Choose three.)
- A. Setting DBWR_IO_SLAVESto a non zero value can improve backup performance when using asynchronous I/O/
- B. If an RMAN BACKUP VALIDATEcommand takes roughly the same time as an actual backup, then read I/O is a likely bottleneck.
- C. If an RMAN BACKUP VALIDATEcommand takes roughly the same time as an actual backup, then both read and write I/O are likely bottlenecks.
- D. Data files with a high value in V$BACKUP_SYNC_IO.DISCRETE_BYTES_PER_SECONDare a potential performance bottleneck when synchronous I/O is used.
- E. Setting DBWR_IO_SLAVESto a non zero value can improve backup performance when using synchronous I/O.
- F. Data files with a high value in V$BACKUP_ASYNC_IO.SHORT_WAITSare a potential performance bottleneck when asynchronous I/O is used.
- G. If an RMAN BACKUP VALIDATEcommand takes noticeably less than an actual backup, then write I/O is a likely bottleneck.
正解：B、E、G
解説：
http://docshare04.docshare.tips/files/21043/210437276.pdf
質問 # 70
Which three actions are performed by Database Upgrade Assistant (DBUA)? (Choose three.)
- A. It empties the RECYCLE BIN.
- B. It recompiles all stored PL/SQL code by using utlrp.sql.
- C. It performs prerequisite checks to verify if the Oracle database is ready for upgrade.
- D. It sets all user tablespaces to "read-only" before starting the upgrade.
- E. It increases tablespace size, if required, to meet upgrade requirements.
- F. It removes the AUDSYS schema and the AUDIT_ADMIN and AUDIT_VIEWER roles
正解：A、C、E
解説：
Reference:
https://docs.oracle.com/en/database/oracle/oracle-database/12.2/upgrd/upgrading-oracle-database-upgrade-assistant-dbua.html#GUID-307DACD9-ECEE-4079-B767-B22620B99900
https://docs.oracle.com/en/database/oracle/oracle-database/12.2/upgrd/upgrading-oracle-database-upgrade-assistant-dbua.html#GUID-8BDDF859-1638-45AC-824D-78FC8154847C
質問 # 71
Choose two. Which two are true about Oracle Database Configuration Assistant (DBCA)?
- A. It can be used to create container databases and non-container databases.
- B. It can only be launched from the command line interface.
- C. It can be used to change the character set of an existing database.
- D. It can be launched from both the command line and the Universal Installer (OUI) interfaces.
- E. It can be used to convert a non-container database to a container database.
正解：A、D
質問 # 72
Which two are facets of performance planning that should always be considered or implemented for an Oracle Database environment? (Choose two.)
- A. the configuration of storage arrays
- B. defining primary keys for all tables to speed up all queries
- C. the physical data model
- D. using check constraints to speed up updates
- E. defining foreign keys for all tables to speed up joins
正解：A、C
質問 # 73
Examine the command for creating pluggable database PDB2 in container database CDB2. Select three options, any one of which is required for it to execute successfully. (Choose three.)
- A. Set only the PDB_FILE_NAME_CONVERT parameter.
- B. Add only the CREATE_FILE_DEST clause to the statement.
- C. Add the FILE_NAME_CONVERT clause to the statement and enable Oracle Managed Files (OMF)
- D. Add the FILE_NAME_CONVERT clause to the statement and set the PDB_FILE_NAME_CONVERT parameter.
- E. Enable only OMF.
- F. Set the PDB_FILE_NAME_CONVERT parameter and enable OMF.
正解：A、B、E
質問 # 74
Which three are true about Automatic Workload Repository (AWR), Automatic Database Diagnostic Monitor (ADDM), and the Manageability Monitor (MMON) background process?
(Choose three.)
- A. ADDM can recommend extending the buffer cache.
- B. ADDM can recommend shrinking the buffer cache.
- C. AWR snapshots must be deleted when no longer required by ADDM.
- D. ADDM performs its analysis only when a DBA requests it.
- E. By default, MMON creates an AWR snapshot every 30 minutes.
- F. By default, AWR snapshots are automatically purged after eight days.
正解：A、B、F
解説：
AWR Snapshot's default interval is 1 hour and retention is 8 days. It means All AWR statistics are collected every 1 hour and they are kept 8 days by default.
質問 # 75
Choose two You upgrade your database from pre-12c to a multitenant container database (CDB) that contains pluggable databases (PDBs). Examine the query and its output: SQL> SELECT * FROM v $PWFILE_users; USERNAME SYSDB SYSOP SYSAS SYSBA SYSDG SYSKM CON_ID ------------------------------------------------------------------------SYS TRUE TRUE FALSE FALSE FALSE FALSE 0 Which two tasks must you perform to add users with the SYSBACKUP, SYSDG, and SYSKM prileges to the password file?
- A. Re-create or migrate the password file to the Oracle Database 12c format
- B. Grant the SYSBACKUP, SYSDG, and SYSKM privileges to the intended users.
- C. Copy the password file from a sample file in the DBS dierectory
- D. Assign appropriate operating system groups to SYSBACKUP, SYSDG, and SYSKM.
正解：A、B
質問 # 76
Identify three reasons for using a recovery catalog with Recovery Manager (RMAN).
- A. to allow database duplication without a connection to the auxiliary instance.
- B. to store backup metadata that would cause the controlfile to become too large.
- C. to store backups that would cause the controlfile to become too large.
- D. to report on the database schema at an earlier point in time.
- E. to allow database duplication without a connection to the target instance.
正解：B、D、E
質問 # 77
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