1z0-182 Oracle Database 23ai Administration Associate exact Exam Questions

Oracle Database 23ai Administration Associate

Last Update 19 hours ago Total Questions : 94

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Question # 4

Which two statements are true about the DUAL table?

It can be accessed by any user who has the SELECT privilege in any schema.

It consists of a single row and single column of VARCHAR2 data type.

It can display multiple rows but only a single column.

It can be accessed only by the SYS user.

It can display multiple rows and columns.

It can be used to display only constants or pseudo columns.

Question # 5

Which two statements are true about the UNLIMITED TABLESPACE system privilege and space quota?

It allows a user to have unlimited space in any tablespace in the database.

It is overridden by a space quota specified for the user.

It allows a user to have unlimited space only in their default permanent tablespace.

It allows a role to have unlimited space in any tablespace in the database.

By default, users have no quota on their default permanent tablespace.

Question # 6

Which two statements are true about advanced connection options supported by Oracle Net for connection to Oracle?

Connect Time Failover requires the use of Transparent Application Failover (TAF).

Source Routing requires the use of encrypted connections.

Connect Time Failover requires the connect string to have two or more listener addresses configured.

Load Balancing requires the use of a name server.

Load Balancing can balance the number of connections to dispatchers when using a Shared Server configuration.

Question # 7

orcl.dmp contains a full export of the ORCL database. This command is executed to load data from orcl.dmp into the TESTDB database: [oracle@host01 ~] impdp system/oracle SCHEMAS=sh,oe REMAP_SCHEMA=sh:hr DUMPFILE=orcl.dmp EXCLUDE=index TABLE_EXISTS_ACTION=replace LOGFILE=impdp.log Which two statements are true?

It drops and re-creates indexes that exist in both ORCL:SH and TESTDB:HR.

It skips only tables that exist in ORCL:SH and ORCL:OE.

It skips all indexes of ORCL:SH and in both ORCL:SH and TESTDB:HR.

It drops and re-creates tables that exist in both ORCL:SH and TESTDB:HR.

It skips only indexes that exist in both ORCL:SH and TESTDB:HR.

Question # 8

What memory structure caches the data dictionary providing access to all database user processes?

The Large Pool

The Java Pool

The Streams Pool

The Shared Pool

Question # 9

Which statement is true about database links?

A public database link can be created only by SYS.

A database link can be created only between two Oracle databases.

A database link created in a database allows a connection from that database's instance to the target database's instance, but not vice versa.

A public database link can be used by a user connected to the local database instance to connect to any schema in the remote database instance.

Private database link creation requires the same user to exist in both the local and the remote databases.

Answer:

Explanation:

Database links enable cross-database queries in Oracle. Let’s analyze each option with extensive detail:

A. A public database link can be created only by SYS.

Explanation:False. Any user with the CREATE PUBLIC DATABASE LINK privilege (not just SYS) can create a public link (e.g., CREATE PUBLIC DATABASE LINK remote_db CONNECT TO scott IDENTIFIED BY tiger USING 'orcl'). While SYS typically has this privilege, it’s not exclusive to SYS.

Mechanics:Privilege is granted via GRANT CREATE PUBLIC DATABASE LINK TO user;. Public links are accessible to all users in the local DB.

Why Incorrect:Overly restrictive; Oracle’s security model allows delegation.

B. A database link can be created only between two Oracle databases.

Explanation:False. Database links can connect to non-Oracle databases using Oracle Heterogeneous Services or gateways (e.g., ODBC or JDBC drivers), such as linking to SQL Server. Example: CREATE DATABASE LINK mssql_link USING 'hsodbc';.

Mechanics:Requires configuration of hs_ parameters in init.ora and a gateway listener.

Historical Note:Heterogeneous links were introduced in 8i, expanded in 23ai for cloud integration.

C. A database link created in a database allows a connection from that database's instance to the target database's instance, but not vice versa.

Explanation:True. A database link is unidirectional; it enables queries from the local instance to the remote instance (e.g., SELECT * FROM emp@remote_db), but the remote instance can’t use it to query back unless a separate link is created there.

Mechanics:Stored in DBA_DB_LINKS, the link defines a one-way connection via a TNS alias or connect string.

Practical Use:Ensures controlled access; bidirectional access requires explicit configuration.

Edge Case:Loops are prevented unless explicitly designed with mutual links.

D. A public database link can be used by a user connected to the local database instance to connect to any schema in the remote database instance.

Explanation:False. Public links allow all local users to use them, but access to remote schemas depends on the link’s credentials (e.g., CONNECT TO scott) and the user’s remote privileges. “Any schema” overstates it; access is limited to what the link’s user can see.

Why Incorrect:Misrepresents privilege scope; remote schema access isn’t universal.

E. Private database link creation requires the same user to exist in both the local and the remote databases.

Explanation:False. A private link (e.g., CREATE DATABASE LINK my_linkCONNECT TO scott IDENTIFIED BY tiger USING 'orcl') requires the remote user (scott) to exist, but the local creator (e.g., HR) need not match. The link is owned locally and authenticated remotely.

Mechanics:Only the CREATE DATABASE LINK privilege is needed locally.

[References:Oracle Database Administrator’s Guide 23ai, "Managing Database Links"; Oracle Database SQL Language Reference 23ai, "CREATE DATABASE LINK.", , ]

Question # 10

Examine this command: ALTER DATABASE MOVE DATAFILE '\u01/sales1.dbf' TO '\u01/sales01.dbf' REUSE; Which two statements are true?

DML may be performed on tables with one or more extents in this data file during the execution of this command.

If Oracle Managed Files (OMF) is used, then the file is renamed but moved to DB_CREATE_FILE_DEST.

The tablespace containing SALES1.DBF must be altered READ ONLY before executing the command.

The file is renamed and stored in the same location.

The tablespace containing SALES1.DBF must be altered OFFLINE before executing the command.

Answer:

A, D

Explanation:

This command moves/renames a data file online. Let’s evaluate:

A. DML may be performed on tables with one or more extents in this data file during the execution of this command.

Explanation:True. Introduced in 12c and refined in 23ai, MOVE DATAFILE is an online operation, allowing DML (e.g., INSERT, UPDATE) on tables within the file. Oracle ensures consistency via redo and undo.

Mechanics:The file is copied to the new location/name while tracking changes, then switched atomically.

Practical Use:Minimizes downtime in production systems.

B. If Oracle Managed Files (OMF) is used, then the file is renamed but moved to DB_CREATE_FILE_DEST.

Explanation:False. With OMF, omitting the TO clause would place the file in DB_CREATE_FILE_DEST, but here, TO '\u01/sales01.dbf' explicitly specifies the target, overriding OMF defaults.

Mechanics:OMF only applies if the destination is unspecified (e.g., MOVE DATAFILE ... without TO).

Why Incorrect:Explicit path trumps OMF behavior.

C. The tablespace containing SALES1.DBF must be altered READ ONLY before executing the command.

Explanation:False. READ ONLY isn’t required; the operation is online and supports active use.

Why Incorrect:Conflicts with Oracle’s online move feature.

D. The file is renamed and stored in the same location.

Explanation:True. The command renames /u01/sales1.dbf to /u01/sales01.dbf (correcting \u01 to /u01 as a Windows/Unix typo), keeping it in /u01/. REUSE allows overwriting if sales01.dbf exists.

Mechanics:File is copied and renamed in-place within the same filesystem directory.

E. The tablespace containing SALES1.DBF must be altered OFFLINE before executing the command.

Explanation:False. Offline mode isn’t needed; the online move handles activetablespaces.

[References:Oracle Database Administrator’s Guide 23ai, "Moving Data Files Online"; Oracle Database SQL Language Reference 23ai, "ALTER DATABASE.", , ]

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