分類版本：

一 oracle 安全備份（OSB)

01 examine the probable steps involved in the basic backup process of
RMAN and oracle secure backup (OSB):
檢查RMAN和oracle安全備份(OSB)的基本備份過程中可能涉及的步驟:
1 rman initiates backup and passes the database backup storage
selector to OSB.
rman啟動備份并將數據庫備份存儲選擇器傳遞給OSB。
2 rman creates the backup job.
rman創(chuàng)建備份作業(yè)。
3 osb creates the backup job with an osb user.
osb用osb用戶創(chuàng)建備份作業(yè)。
4 rman updates its repository.
rman更新它的存儲庫。
5 rman executes the job and transfers data from a client to media.
rman執(zhí)行任務并將數據從客戶機傳輸到媒體。
6 osb executes the job and transfers data from a client to media.
osb執(zhí)行任務并將數據從客戶端傳輸到媒體。
7 osb updates its repository.
osb更新它的存儲庫。
identify the required steps in the correct order.
按照正確的順序確定所需的步驟。
A) 1,3,6,7,4

02 examine the steps to configure oralce secure backup (OSB) for use with RMAN:
檢查步驟配置oralce安全備份(OSB)與RMAN使用:
1 create media families for data files and archived redo log file.
創(chuàng)建媒體家族的數據文件和存檔重做日志文件。
2 configure database backup storege selectors or RMAN media management paramenters.
配置數據庫備份存儲選擇器或RMAN媒體管理參數。
3 create an OSB user preauthorized for RMAN operations.
為RMAN操作創(chuàng)建一個預先授權的OSB用戶。
4 configure RMAN access to the OSB SBT.
配置對OSB SBT的RMAN訪問。
5 disable non-unform memory access (NUMA) awareness by setting the ob_ignore_numa parameter to 0.
通過將ob_ignore_numa參數設置為0來禁用非unform內存訪問(NUMA)感知。
identify the steps in the correct order.
按照正確的順序確定步驟。
C 4,3,1,2,5

03 Which three requirements should be successfully met by an Oracle Secure Backup (OSB) user so that OSB performs RMAN backup or restore requests?
OSB用戶應成功滿足以下三個要求，以便OSB執(zhí)行RMAN備份或還原請求？
A.RMAN preauthorization on the host
B.OSB encryption for data in transport and on tape
C.matching the OS user identity of the Oracle instance associated with the database username
D.assigned to a class with rights to back up or restore Oracle database
E.scheduling of the RMAN backup to occur automatically at user-defined intervals
F.assigned to a class with rights to browse all directories and catalogs
Answer ACD
解析
1）在該主機上進行RMAN預授權
2）匹配與數據庫關聯(lián)的Oracle實例的OS用戶身份（例如oracle）
3）分配給具有備份或還原Oracle數據庫權限的類，即OSB類：
-訪問Oracle備份（設置為所有者，類或全部）
-執(zhí)行Oracle備份和還原
如果未成功滿足這三個條件，則OSB不會執(zhí)行RMAN備份或還原請求。

04 which three statements are true about oralce secure backup (OSB)?
哪三個陳述是正確的關于口頭安全備份(OSB)?
A) it can encrypt client data written to tape.
它可以加密寫入磁帶的客戶數據。
C) it can be used to manage tape backup and restore operations for multiple databases.
可用于管理多個數據庫的磁帶備份和恢復操作。
E) it can be used to perform file system backups at the file, directory, file system, or raw partition level.
可以使用它在文件、目錄、文件系統(tǒng)或原始分區(qū)級別執(zhí)行文件系統(tǒng)備份。

05 eamine the steps/operations performed during the RMAN backup operration by using oralce secure backup(OSB):
使用oralce安全備份(OSB)執(zhí)行RMAN備份操作期間執(zhí)行的步驟/操作:
1 start the rman client by using the rman target/command.
使用rman目標/命令啟動rman客戶端。
2 start the rman client by using the OSB user.
使用OSB用戶啟動rman客戶端。
3 rman creates the backup pieces.
rman創(chuàng)建備份片段。
4 run the rman backup command with the sbt channels.
使用sbt通道運行rman backup命令。
5 osb creates a backup job and assigns a unique identifier.
osb創(chuàng)建一個備份作業(yè)并分配一個唯一標識符。
6 osb creates a backup job request through the osb sbt library.
osb通過osb sbt庫創(chuàng)建一個備份作業(yè)請求。
7 osb stores metadata about rman backup pieces in the osb catalog.
osb在osb目錄中存儲關于rman備份片段的元數據。
8 osb starts the backup operation.
osb啟動備份操作。
9 osb updates the rma ncatalog.
osb更新rma ncatalog。
identify the required steps/operations performed in correct order.
確定按正確順序執(zhí)行的所需步驟/操作。
C) 2,4,6,5,8,3,7

二 閃回技術

01 in your database, the user scott wants to retrieve the dropped hr.emplyees table by using the command:
在您的數據庫中，用戶scott希望檢索丟失的hr.employees使用命令:
sql> flagback table hr.employees to before drop;
what are three for this command to succees?
這個命令成功的三個是什么?
B) no other table with the same name should exist in the hr schema.
hr模式中不應該存在同名的其他表。
C) scott should have the flashback any table privilege.
scott應該有倒敘任何桌子的特權。
F) the recycle bin should be enabled.
應啟用回收站。

02 which two are prerequisites for performing flashback transaction?
哪兩個是執(zhí)行閃回事務的先決條件?
A) a supplemental log must be enabled for the primary key.
必須為主鍵啟用補充日志。
D) the EXECUTE privilege must be granted to a user on the DBMS_FLASHBACK package.
必須將EXECUTE特權授予DBMS_FLASHBACK包上的用戶。

03 your database is running in archivelog mode.complete database backup are performed daily at midnight.
您的數據庫正在以archivelog模式運行。每天在午夜執(zhí)行完整的數據庫備份。
A user accidentally truncates an inportant table at 10 AM after the last backup.
在最后一次備份之后，用戶在上午10點意外地截斷了一個重要表。
after that, a few important transactions are performed on the database.
之后，在數據庫上執(zhí)行一些重要的事務。
which two best methods for recovering the truncated table data?
哪兩種最好的方法恢復被截斷的表數據?
A) table point-in-time recovery
表點時間恢復
E) flashback transaction backout
閃回事務回退

04 which three statements are true about flashback data archive?
關于閃回數據歸檔，哪三個陳述是正確的?
A) flashback data archive prevents flashback queries from getting a snapshot too-old error.
閃回數據存檔防止閃回查詢得到一個快照太老的錯誤。
B) a table enabled for flashback data archive cannot be dropped unless flashback data archive is disabled or disassociated first.
一個啟用了閃回數據存檔的表不能被刪除，除非閃回數據存檔先被禁用或斷開關聯(lián)。
D) while enabling flashback data archive for a table , if no name is provided for flashback data archive , it is enabled using the default flashback data archive.
當為表啟用閃回數據存檔時，如果沒有為閃回數據存檔提供名稱，則使用默認的閃回數據存檔啟用。
解析：https://docs.oracle.com/database/121/ADFNS/adfns_flashback.htm#ADFNS637
*要刪除為閃回數據庫存檔啟動的表，必須首先使用該alter table … no flashback archive 子句在表上禁用閃回數據存檔

05 which two are prerequisites for setting up flashback data archive?
哪兩個是設置閃回數據歸檔的先決條件?
D) automatic undo management should be enabled.
應啟用自動撤消管理。
F) the tablespace in which the flashback data archive is created should have automatic segment space management(ASSM) enabled.
創(chuàng)建閃回數據歸檔的表空間應該啟用自動段空間管理(ASSM)。

06 examine the statements that use flashback technologies:
檢查使用倒敘技術的語句:
1 flashback table customers to timestamp to_timestamp (‘2013-02-04 09:30:00’, ‘YYYY-MM-DD HH:MI:SS’);
閃回表客戶到時間戳to_timestamp (‘2013-02-04 09:30:00’， ‘YYYY-MM-DD HH:MI:SS’);
2 select * from customes as of scn 123456;
從定制中選擇截至scn 123456;
3 flashback table customes to before drop;
閃回表定制前下降;
4 flashback database to timestamp to_timestamp (‘2013-02-04 09:30:00’, ‘YYYY-MM-DD HH:MI:SS’);
閃回數據庫到時間戳to_timestamp (‘2013-02-04 09:30:00’， ‘YYYY-MM-DD HH:MI:SS’);
5 select * from customes versions betweem scn 123456 and 123999;
從定制版本betweem scn 123456和123999中選擇;
6 alter table customer flashback archive;
alter table客戶閃回存檔;
which set of statements depends on the availability of relevant undo data in the undo tablespace?
哪一組語句依賴于undo表空間中相關undo數據的可用性?
A) 1,2,5

07 in which situation can you use flashback database?
在什么情況下可以使用閃回數據庫?
D) when returning to a point in time before the most recent open resetlogs operation.
當返回到最近打開resetlogs操作之前的時間點時。

08 you enabled flashback data archive for a table for which you want to track and save all transactions for four years.
您為一個表啟用了閃回數據歸檔，您希望跟蹤并保存該表的所有事務達四年之久。
after some time , the requirement changes for keeping transaction form to two years.
一段時間后，保持交易形式的要求更改為兩年。
you execute the following command to change the requirement:
您可以執(zhí)行以下命令來更改需求:
sql> alter flashback archive fda1 modify retension 2 year;
what is the outcome?
結果是什么?
B) all historical data older than two years.if any , is purged from the flashback archive fda1.
所有兩年以上的歷史數據，如果有，則從閃回存檔fda1中清除。

09 （重復類似） Flashback Data Archive has been configured to retain data on all transactions that modify a table for a period of four years.
Flashback Data Archive已配置為保留四年期間內修改表的所有事務上的數據。
Three years later,it is decided to change the retention period
三年后，決定改變留用期限
You execute this command:
您執(zhí)行以下命令:
SQL> ALTER FLASHBACK ARCHIVE fda1 MODIFY RETENSION RETENTION 2 YEAR;
SQL> ALTER FLASHBACK ARCHIVE fda1修改re張力保留2年;
Which is true?
這是真的嗎?
E）Data older than two years,if any,is purged from the flashback archive FDA1.
超過兩年的數據(如果有的話)將從閃回存檔FDA1中清除。

10 you want to create a guaranteed restore point for your database by executing the command:
您希望通過執(zhí)行以下命令為您的數據庫創(chuàng)建一個有保證的恢復點:
SQL> create restore point dbrsp1 guarantee flashback database;
SQL>創(chuàng)建恢復點dbrsp1保證閃回數據庫;
identify two prerequisites for the successful execution of this command.
確定成功執(zhí)行此命令的兩個先決條件。
A) the database must be running in archivelog mode.
數據庫必須運行在archivelog模式。
C) fast recovery area must be enabled.
快速恢復區(qū)域必須啟用。
Answer AC
解析：http://docs.oracle.com/cd/B19306_01/backup.102/b14192/rpfbdb002.htm
為了支持使用保證的還原點，數據庫必須滿足以下要求：
1.在COMPATIBLE初始化參數必須設置為10.2或更高。
2.數據庫必須以ARCHIVELOG模式運行。將FLASHBACK DATABASE用于數據庫恢復到操作保證還原點需要來自各地的還原點時使用歸檔重做日志。
3.必須配置閃回恢復區(qū)，如“為RMAN設置閃回恢復區(qū)”中所述。保證的還原點使用類似于閃回日志記錄的機制，并且與閃回日志記錄一樣，Oracle必須將所需的日志存儲在閃回恢復區(qū)域中。
如果未啟用閃回數據庫，則在創(chuàng)建第一個保證的還原點時（或者如果所有先前創(chuàng)建的保證的還原點已被刪除），必須掛載而不打開數據庫。

11 （題目有問題只有一個選項是正確的）
examine the command and its output:
檢查命令及其輸出:

B) it automatically flashes back all the indexes on the employes table.
它會自動閃回所有在雇員表上的索引。
C) it automatically flashes back any triggers defined on the table.
自動閃回表上定義的任何觸發(fā)器。
Answer BC 更正

12 your database is running in archivelog mode and automatic undo management is enabled.
您的數據庫正在以archivelog模式運行，并且啟用了自動撤銷管理。
which two tasks should you perform before enabling flashback database?
在啟用閃回數據庫之前應該執(zhí)行哪兩個任務?
B) ensure that the db_flashback_retention_target parameter is set to a point in time (in minutes) to which the database can be flashed back.
確保將db_flashback_retention_target參數設置為可以將數據庫閃回的時間點(以分鐘為單位)。
E) enable fast recovery area.
啟用快速恢復區(qū)域。
Answer BE
參考：https://docs.oracle.com/database/121/BRADV/flashdb.htm#BRADV582
閃回數據庫使用其自己的日志記錄機制，創(chuàng)建閃回日志并將其存儲在快速恢復區(qū)域中。如果閃回日志可用，則只能使用閃回數據庫。要利用此功能，必須預先設置數據庫以創(chuàng)建閃回日志。

13 you create a default flashback data archive fla1 and enable it for the employees table in the hr schema.
您將創(chuàng)建一個默認的閃回數據歸檔fla1，并為hr模式中的employees表啟用它。
after a few days, you want to alter the employees table by executing the command:
幾天后，您想通過執(zhí)行以下命令更改employees表:
sql> alter table employees add phone number(12);
sql> alter表員工添加電話號碼(12);
which statement is true about the execution of the command?
關于命令的執(zhí)行，哪個陳述是正確的?
C) it executes successfully and continues to store metadata related to the employees table.
它成功執(zhí)行并繼續(xù)存儲與employees表相關的元數據。

14 which two statements are true about flashback version query?
關于閃回版本查詢，哪兩句話是正確的?
B) it can be used to create views.
它可以用來創(chuàng)建視圖。
D) it retrievers all version of rows that exist in a time interval, including the start time and end time.
它檢索一個時間間隔內，存在的行的所有版本，包括開始時間和結束時間。

15 which two statements are true when row-archival management is enabled?
啟用行存檔管理時，哪兩個語句是正確的?
B) the ora_archive_state column is updated manually or by a program that can reference archivity tracking columns, to indicate that a row is no longer considered actuve.
ora_archive_state列是手動更新的，或者由一個可以引用archivity tracking列的程序來更新，以表明一行不再被認為是actuve。
D) the ora_archive_state column is visible if it is referenced in the select list of a query.
如果在查詢的選擇列表中引用了ora_archive_state列，則該列可見。

16 your database has a table customers that contains the columns cust_ name , amt_due, and old_status.
您的數據庫有一個表customers，其中包含列cust_ name、amt_due和old_status。
examine the commands executed and their output:
檢查執(zhí)行的命令和它們的輸出:

which is it that only one update is listed by the flashback version query?
閃回版本查詢只列出一個更新是哪一個?
B) the undo data that existed for version of rows before the change to the table structure is invalidated.
對表結構進行更改之前存在的行版本的撤銷數據無效。

17 automatic undo management is enabled for your database.
為您的數據庫啟用了自動撤消管理。
you want a user to retrieve metadata and historical data for a given transaction or for transactions in a given time interval.
您希望用戶檢索給定事務或給定時間間隔內的事務的元數據和歷史數據。
which three are prerequisites to fulfill this requirement?
哪三個是滿足這個要求的先決條件?
A) minimal supplemental logging must be enabled.
必須啟用最小補充日志記錄。
B) the database must be running in archivelog mode.
數據庫必須在archivelog模式下運行。
E) the select any transaction privilege must be granted to the user.
必須將select any事務特權授予用戶。

18 you create a table with the period for clause to enable the use of the temporal validity feature of oralce database 12c.
您可以創(chuàng)建一個帶有period for子句的表，以啟用oralce數據庫12c的時間有效性特性。
examine the table definition:
檢查表定義:

which three statements are true concerning the use of the valid time temporal feature for the employees table?
關于雇員表的有效時間特性的使用，哪三個陳述是正確的?
A) The valid time columns employee_time_start and employee_time_end are automatically created.
有效的時間列employee_time_start和employee_time_end是自動創(chuàng)建。
B) The same statement may filter on both transaction time and valid temporal time by using the AS OF TIMESTAMP and PERIOD FOR clauses.
同一語句可以使用時間戳的AS和子句的PERIOD對事務時間和有效時間進行過濾。
C) The valid time columns are not populated by the Oracle Server automatically.
有效時間列沒有被Oracle服務器自動填充。

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