Oracle OCP 19c 认证1Z0-083考试(115-120题) #7月最新

Posted 2022-11-26 wwwleoocom

 
Which three actions are performed by Database Upgrade Assistant (DBUA)? (Choose three.) A. It recompiles all stored PL/SQL code by using utlrp.sql.

B.    It empties the RECYCLE BIN.

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 removes the AUDSYS schema and the AUDIT_ADMIN and AUDIT_VIEWER roles

F.    It increases tablespace size, if required, to meet upgrade requirements.

Answer: ABC

(解析:这道题考的很细,居然考升级中的某个具体细节。Prerequisities
There are a lot of potential prerequisites, which will vary depending on the functionality you are
using in your source version. Please check them in the documentation, or you may fail to upgrade your database successfully.

In addition to other prerequisites, you will always be asked to do the following actions 
Gather dictionary statistics. For a non-CDB database you will do the following from an SQL prompt. CONN / AS SYSDBA
EXEC DBMS_STATS.GATHER_DICTIONARY_STATS;

For a container database you will use the following command to perform the action in all containers.

$ORACLE_HOME/perl/bin/perl $ORACLE_HOME/rdbms/admin/catcon.pl -l /tmp -b gather_dict_stats    x"EXEC DBMS_STATS.gather_dictionary_stats"
Purge the recycle bin using the following from an SQL prompt. CONN / AS SYSDBA PURGE DBA_RECYCLEBIN
Compile all invalid objects. For a non-CDB database you will do the following from an SQL prompt. CONN / AS SYSDBA @?/rdbms/admin/utlrp.sql
For a container database you will use the following command to perform the action in all containers.

$ORACLE_HOME/perl/bin/perl    $ORACLE_HOME/rdbms/admin/catcon.pl    -l    /tmp    -b comp_invalid_objs    x"@?/rdbms/admin/utlrp.sql"
 
Reference: https://oracle-base.com/articles/12c/upgrading-to-12c 
78、

Which two are true about RMAN backups when using a media manager to write backups to tape when there are only two tape drives? (Choose two.)

A.    SBT tape compression can be used even if no RMAN compression is configured.

B.    Any backup set written to the SBT device in this configuration can contain a maximum of two backup pieces.

C.    Any backup written to the SBT device in this configuration can contain a maximum of two backup sets.

D.    SBT tape compression and RMAN backup compression should be used in parallel.

E.    The SBT device should be configured to use PARALLELISM 2 to allow both tape drive to be used simultaneously.

Answer: AE

(解析:磁带的压缩是自带的,有高密盘和低密盘之分,由于有 2 个驱动器,所以在备份的 时候最好配置并行 2 去备份。)

79、
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 will be an owner of the Oracle Inventory.

B.    oracle must be the owner of every Oracle Database installation.

C.    oracle can own an Oracle Database installation but not an Oracle Grid Infrastructure installation.
D.    oracle will be granted the SYSASM privilege when installing the Oracle Database software.

E.    The user account, oracle, and group, oinstall, can be used for all Oracle software installations.

Answer: CE

(解析:安装结束后,GI 是属于 root 用户的,数据库软件是属于 oracle 用户的;两个软件也可以使用同一个用户来安装。)

 
80、

Examine this configuration:

While    CDB1    is    open,    ‘/u02/app/oracle/fast_recover_area/cdb1/CDB1/controlfile02.ctl’is accidentally deleted.

To recover from this critical failure, you execute these commands:

What will be the outcome?

A.    It will create ‘$ORACLE_HOME/dbs/cdb1/CDB1/controlfile02.ctl’

B.    It will create ‘/u01/app/oralce/oradata/CDB1/controlfile/controlfile02.ctl’.

C.    It will re-create ‘/u02/app/oracle/fast_recover_area/cdb1/CDB1/controlfile02.ctl’

D.    It will create ‘/u01/app/oracle/product/12.2.0.1/db_1/dbs/snapcf_cdb1control02.ctl’. E. It will fail because there is no autobackup of the controlfiles.

Answer: C

(解析:经过测试,可以用 rman 命令从一个控制文件恢复到另外一个控制文件。) 
81、

Examine these actions:

1.    Create a new database for a recovery catalog.

2.    Create a tablespace with sufficient space in the catalog database for the recovery catalog.

3.    Configure ARCHIVE LOG mode for the catalog database.

4.    Create a user to own the recovery catalog schema with quota on the tablespace that will contain the catalog.

5.    Grant the RECOVERY_CATALOG_OWNER role to the recovery catalog schema owner.

6.    Grant the SYSBACKUP privilege to the recovery catalog schema owner.

Which are the minimum actions that must be performed before executing the CREATE CATALOG command?

A. 2, 4, 5, 6

B. 1, 2, 3, 4, 5, 6

C. 1, 2, 4, 5

D. 2, 4, 5

E. 1, 3, 4, 5
 
Answer: D

(解析:题目说最小的操作来实现。) 
82、

Which two are true about creating pluggable databases (PDBs) using snapshots in Oracle 19c and later releases? (Choose two.)

A.    A PDB snapshot is always a full copy of the source PDB.

B.    A PDB snapshot is always a sparse copy of the source PDB.

C.    A snapshot copy PDB depends on a storage snapshot which can only be stored on specific file systems.

D.    A PDB snapshot depends on a storage snapshot which can be stored on any file system.

E.    A PDB snapshot depends on a storage snapshot which can only be stored on specific file systems.
F.    A snapshot copy PDB depends on a storage snapshot which can be stored on any file system.

G.    A snapshot copy PDB can be created from a stand-alone clone PDB. Answer: CG
Explanation:

Reference:        https://docs.oracle.com/en/database/oracle/oracle- database/18/multi/administering-    pdb-snapshots.html#GUID-35B03C37-00BA-4945-BF20- 9A7C4C541955

(解析:这些题目太有难度了,拼的就是经验啊,实际的工作经验。)

使用 USING snapshot 子句创建的 PDB 快照和使用 snapshot copy 子句创建的快照副本 PDB 是两种不同类型的快照。USING    SNAPSHOT    子句创建一个不需要具体化的完整PDB。SNAPSHOT COPY 子句创建一个稀疏 PDB,如果要删除它所基于的存储快照,则必须具体化该 PDB。所 以答案 AB 错。
当您在 CREATE PLUGGABLE DATABASE 中指定 SNAPSHOT COPY 子句时。。在 sourcepdb 中, 源PDB 的所有数据文件必须驻留在同一存储类型中。

存储要求取决于 CLONEDB 初始化参数的设置:

CLONEDB=FALSE

源 PDB 文件的底层文件系统必须支持存储快照。这些文件系统包括 Oracle 自动存储管理群集文件系统(Oracle ACFS)和直接 NFS 客户端存储。Oracle Exadata 支持配置了稀疏 ASM 网 格磁盘的 ASM 上的快照复制功能。所以答案 E 对。

CLONEDB=TRUE
 
源 PDB 文件的底层文件系统可以是任何本地文件系统、网络文件系统(NFS)或启用了直接NFS 并支持稀疏文件的集群文件系统。大多数 UNIX 系统都满足这些要求,包括 Oracle ACFS 和 ZFS。但是,当 CLONEDB=TRUE 时,当克隆存在时,源 PDB 必须保持以只读模式打开。所 以答案 D 对。

83、
Which two are true about Oracle Database Configuration Assistant (DBCA) templates? (Choose
two.)

A.    The General Purpose of Transaction Processing templates are most suitable when concurrency and recoverability are key criteria.

B.    Oracle DBCA templates can store only logical structure and not database files.

C.    New templates can only be created by modifying an existing user-created template.

D.    The Data Warehouse template is most suitable when transaction response time is the key criterion.

E.    Oracle DBCA templates can be used to create new databases and duplicate existing databases.

Answer: AE

(解析:真是 DBCA 新的考点。)

Reference:    https://docs.oracle.com/database/121/ADMQS/GUID-2B8A3B5E-D319-4377-8B22- 8BB67DCC9885.htm#ADMQS0235

。

83、
choose one

You want to create a test database as a replica of your production database with minimum intervention from a DBA.

Which method would you use?

A)    Use DBCA to create a template from the existing database to contain the database structure with data files and then use the same template to create the database in the new location.

B)    Use Database Configuration Assistant (DBCA) to create a template from the existing database to contain the database structure.

C)    Use DBCA to create a template from the existing database to contain the database structure and then manually copy the data by using Oracle Data Pump.
 
D)    Create the database by using the CREATE DATABASE . . . command and manually import data by using Data Pump.

Answer:A

(解析:DBCA 可以基于当前的数据库创建一个数据库模版,然后根据这个模版创建一个与 当前数据库一样新的数据库。)

84、
Which two statements are true about the Database Configuration Assistant (DBCA)?

A)    It can configure Automatic Storage Management (ASM) diskgroups.

B)    It can be used to copy an existing Oracle database to a new host and apply any patches necessary in the new host.

C)    It can be used to add a new tablespace.

D)    It can be used to create a database template from an existing database.

E)    It can generate SQL database creation scripts.

Answer:DE

(解析:配置 ASM 需要用到 asmca,用 dbca 可以创建数据库模版,也可以创建建库的脚本 或 者直接建库。)

85、
You plan to create a database by using the Database Configuration Assistant (DBCA), with t he
following specifications:

Applications will connect to the database via a middle tier. The number of concurrent user connections will be high.
The database will have mixed workload, with t he execution of complex BI queries scheduled at night.

Which DBCA option must you choose to create the database?

A.    a General Purpose database template with default memory allocation

B.    a Data Warehouse database template, with t he dedicated server mode option and AMM enabled

C.    a General Purpose database template, with t he shared server mode option and Automatic Memory Management (AMM) enabled
 
D.    a default database configuration Answer: C
(解析:根据上面的要求,选择适合的数据库模板)

Reference: http://www.oracledistilled.com/oracle-database/administration/creating-a-database- using-database-configuration-assistant/