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1z0-076 Bestehen Sie Oracle Database 19c: Data Guard Administration! - mit höhere Effizienz und weniger Mühen

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Oracle 1z0-076 Prüfungsplan:

Thema
Einzelheiten

Thema 1

Backup and Recovery Considerations in an Oracle Data Guard Configuration: In this topic, Backup and recovery procedures in a Data Guard configuration are discussed, including RMAN backups, offloading to physical standby, and network-based recovery.

Thema 2

Using Oracle Active Data Guard: Supported Workloads in Read-Only Standby Databases: Here, the usage of physical standby databases for real-time queries is discussed.

Thema 3

Oracle Data Guard Broker Basics: An overview of the Data Guard broker, its architecture, components, benefits, and configurations, is provided here. It serves as an introduction to the tool used for managing Data Guard configurations.

Thema 4

Using Flashback Database in a Data Guard Configuration: This topic covers the configuration and advantages of using Flashback Database in a Data Guard setup, as well as the process of enabling fast-start failover for seamless role changes.

Thema 5

Oracle Data Guard Basics: This topic covers the essential architecture and concepts of Oracle Data Guard. It includes sub-topics such as the physical and logical standby database comparison, benefits of Data Guard, and its integration with multi-tenant databases.

Thema 6

Creating a Logical Standby Database: This topic guides users through the process of creating and managing a logical standby database, including SQL Apply filtering.

Thema 8

Patching and Upgrading Databases in a Data Guard Configuration: This section provides guidance on patching and upgrading databases in a Data Guard environment, along with performance optimization techniques and monitoring considerations.

Thema 9

Managing Oracle Net Services in a Data Guard Environment: The section focuses on Oracle Net Services and its role in Data Guard networking setup.

Thema 10

Creating a Data Guard Broker Configuration: This section delves into the practical aspects of creating and managing a Data Guard broker configuration, including command-line and Enterprise Manager approaches.

Thema 11

Performing Role Transitions: Here, the concept of database roles is explained, along with the steps for performing switchovers, failovers, and maintaining physical standby sessions during role transitions.

Oracle Database 19c: Data Guard Administration 1z0-076 Prüfungsfragen mit Lösungen (Q90-Q95):

90. Frage
Which three statements are true about snapshot standby databases?

A. Tablespaces can be created.
B. Tablespaces can be dropped.
C. The switchover TO command allows a switchover operation to a snapshot standby database.
D. The FATLOVER TO command results in a transition of a snapshot standby database to the primary role.
E. A logical standby database can be converted into a snapshot standby database.
F. Tables can be dropped.

Antwort: A,B,F

Begründung:
A snapshot standby database is a fully updateable standby database that is created by converting a physical standby database into a snapshot standby database. The main characteristics of a snapshot standby database include:
B: Tablespaces can indeed be dropped in a snapshot standby database because it is updateable and allows all types of DML and DDL operations that do not conflict with the standby role.
C: Tablespaces can be created in a snapshot standby database for the same reasons that they can be dropped; it supports all operations that do not interfere with its standby nature.
E: Tables can be dropped in a snapshot standby database, as it is a fully updateable standby.
Options A and D are incorrect because 'FAILOVER TO' and 'SWITCHOVER TO' commands are not used with snapshot standby databases in these contexts. A failover converts a standby database into the primary role after the original primary has become unavailable, and is not a reversible role transition. Switchover is a planned role reversal between the primary database and one of its standby databases and is not applicable to snapshot standby databases in the context provided.
Option F is incorrect because a logical standby database cannot be converted into a snapshot standby database directly. A logical standby is used for different purposes such as reporting and querying with real-time data, and its structure is different from a physical standby which can be converted into a snapshot standby.

91. Frage
A customer asks you to propose the most appropriate solution for this set of requirements:
We need a disaster recovery solution that enables us to fail over from our production database with zero data loss.
We want to generate reports from the proposed standby database at the same time that it is used for data protection.
Developers may need to test occasionally on a copy of the live database Which TWO solutions would you recommend?

A. A physical standby database with real-time apply enabled
B. A physical standby database with real-time query enabled
C. A logical standby database with real-time query enabled
D. A snapshot standby database with synchronous redo transport
E. A logical standby database with real-time apply enabled

Antwort: B,C

92. Frage
You are planning to perform block comparison using the dbms comp package:

Which TWO statements are true?

A. It requires that the DB_LOST_WKITE_protect initialization parameter be enabled.
B. Logical standby databases can be the target database for the dbms_dbcomp.dbcomp procedure.
C. It can be used to detect lost writes and inconsistencies between the primary database and the cascaded standbys.
D. The databases should be at least mounted before block comparison.
E. You can monitor the progress of an ongoing block comparison operation by querying VS SES SION_LONGOPS.

Antwort: D,E

Begründung:
The DBMS_COMPARISON package, used for comparing and converging data objects within a single database or between databases, requires that the databases involved in the block comparison be at least mounted (A). This allows the procedure to access the data blocks for comparison. Additionally, the progress of long-running operations such as block comparison can be monitored using the dynamic performance view V$SESSION_LONGOPS (D), which provides information on the operation's progress and estimated completion time.
References:Oracle Database PL/SQL Packages and Types Reference provides comprehensive details on the DBMS_COMPARISON package, including its procedures and how to monitor their progress. Additionally, Oracle Database Reference explains the V$SESSION_LONGOPS view, which is commonly used for monitoring long operations in the database.

93. Frage
You notice that the SQL apply lag on your logical standby database has increased but the redo transport lag has not.
Which four could be reasons for the increase in SQL apply lag?

A. An increased number of bulk updates on the primary
B. The standby redo log files are undersized on the primary database
C. An undersized undo tablespace on the logical standby
D. An undersized shared pool
E. Many SQL apply operations do full table scans
F. An increased number of bulk inserts on the primary

Antwort: A,C,D,E

Begründung:
The SQL apply lag on a logical standby database can be caused by several factors:
A: An undersized undo tablespace can lead to delays in SQL apply operations as it may not be able to handle the volume of undo records generated by the SQL apply process.
B: SQL apply operations that do full table scans can consume significant system resources, potentially leading to higher apply lag.
C: An increased number of bulk updates on the primary database may generate a large volume of redo data, which can cause apply lag if the logical standby cannot apply the changes quickly enough.
F: An undersized shared pool may affect the parsing and execution of SQL statements by SQL apply, which can contribute to the apply lag.
Option D is less likely to be a direct cause of SQL apply lag compared to bulk updates, as inserts generate new data rather than modifying existing data, which SQL apply can typically handle more efficiently.
Option E is incorrect because the size of the standby redo log files on the primary database impacts redo transport lag, not SQL apply lag.

94. Frage
Which THREE steps are prerequisites for the creation of a physical standby database on a separate server using the RMAN active database duplication method?

A. startup nomount the standby database instance.
B. Put the primary database into archivelog mode.
C. Set the DB_UNIQUE_NAME parameter on the primary database to a different value than that of the DB_NAME name parameter.
D. Configure Oracle Net connectivity on the primary host to the standby database instance.
E. Establish user equivalence for the database software owner between the primary host and standby host.

Antwort: A,D,E

Begründung:
Creating a physical standby database using RMAN active database duplication requires certain prerequisites to ensure a successful and seamless operation:
Configure Oracle Net connectivity on the primary host to the standby database instance (A): Proper Oracle Net connectivity between the primary and standby servers is essential for communication and data transfer during the duplication process. Oracle Net services provide the network foundation for Oracle Database, Oracle Net Listener, and Oracle applications.
Establish user equivalence for the database software owner between the primary host and standby host (B): User equivalence ensures that the user who owns the Oracle Database software on the primary server has the same privileges on the standby server. This is crucial for RMAN to perform operations on both servers without encountering permission issues.
Startup nomount the standby database instance (C): The standby database instance needs to be started in the NOMOUNT stage before the duplication can begin. This prepares the environment for creating the control file and restoring the database without mounting it, which is a necessary step in the RMAN duplication process.
Reference:
Oracle Database Backup and Recovery User's Guide
Oracle Data Guard Concepts and Administration

95. Frage
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