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Oracle Database 19c: Data Guard Administration 認定 1z1-076 試験問題 (Q29-Q34):

質問 # 29
Which THREE statements are TRUE about the supported workload in Active Data Guard standby databases?

A. PL/SQL blocks that you run on Active Data Guard standby databases can be always redirected to and run on the primary database.
B. The DML operations on a standby can be transparently redirected to and run on the primary database
C. The DDL operations on private temporary tables are transparently redirected to the primary database.
D. You might have to use sequences with global temporary tables to support read-mostly applications by using Active Data Guard.
E. Read-mostly reporting applications that use global temporary tables for storing temporary data can be offloaded.

正解：B、D、E

解説：
In an Oracle Active Data Guard environment:
* B: Read-mostly reporting applications that utilize global temporary tables to store session-specific data can be effectively offloaded to an Active Data Guard standby database, reducing the load on the primary database.
* C: Sequences can be used with global temporary tables on an Active Data Guard standby database to support certain types of read-mostly applications, though some restrictions on sequence use may apply.
* E: In Oracle Database 19c and later, DML redirection allows DML operations performed on an Active Data Guard standby database to be transparently redirected to the primary database. This is part of the DML Redirection feature.
Option A is incorrect because not all PL/SQL blocks run on an Active Data Guard standby database can be redirected to the primary database. Some PL/SQL executions, specifically those that would attempt to make changes to the database, are not supported on the standby.
Option D is incorrect because DDL operations on private temporary tables are not redirected; instead, private temporary tables are session-specific and are not persisted on disk, so they do not generate redo and are not applicable to an Active Data Guard standby.
References: The behavior and capabilities of Active Data Guard standby databases are documented in the Oracle Data Guard Concepts and Administration guide and the Active Data Guard documentation.

質問 # 30
Which four requirements can be met by deploying a logical standby database?

A. It can be used for Real Application Testing without affecting the disaster recovery capabilities.
B. It must have the same physical structure as the primary database.
C. Support for workloads requiring additional indexes.
D. It can be used to create additional tables.
E. It must provide a disaster-recovery solution that protects all data with capability of performing switchovers and failovers.
F. Support for workloads requiring additional materialized views.
G. It can be used to create additional schemas.

正解：A、C、D、F

解説：
A logical standby database is part of Oracle Data Guard and allows the standby database to be open for read-write operations, providing additional flexibility. The requirements met by a logical standby database include:
Support for workloads requiring additional materialized views (A): Logical standby databases can support materialized views, allowing for complex data summarization and reporting workloads.
It can be used to create additional tables (C): Unlike physical standby databases, logical standby databases allow for the creation of additional tables that do not exist in the primary database, enabling custom workloads and reporting.
It can be used for Real Application Testing without affecting the disaster recovery capabilities (E): Logical standby databases can be used to test application changes, patches, and upgrades while still maintaining their role as part of the disaster recovery strategy.
Support for workloads requiring additional indexes (F): Logical standby databases allow for the creation of additional indexes to optimize query performance for reporting and analytical workloads.
Reference:
Oracle Data Guard Concepts and Administration
Oracle Database High Availability Overview

質問 # 31
Your Data Guard environment has one physical standby database using Real-Time Query. Two sequences have been created by these SQL statements:

Neither sequence has been used since being created.
Session 1 connects to the primary database instance and issues these two SQL statements:
SELECT a.nextval FROM DUAL; SELECT b.nextval FROM DUAL;
Then session 2 connects to the physical standby database instance and issues the same SQL statements. Which output will be seen for session 2?
Then session 2 connects to the physical standby database instance and issues the same SQL statements. Which output will be seen for session 2?

正解：A

解説：
In Oracle, a sequence created with the GLOBAL keyword is available and can produce values across all sessions and instances. However, a sequence created with the SESSION keyword is only specific to the session it was created in. When the NEXTVAL is called for a sequence, it will increment according to the sequence's properties set during its creation.
Given the sequence creation statements and the actions performed:
* The a sequence is global, which means it is available across the entire database, including the standby database with Real-Time Query enabled. So, when session 2 calls a.nextval, it will get the next value in the sequence, which is 21 since session 1 already retrieved 1.
* The b sequence is session-specific, so when session 2 calls b.nextval, it will get the value 1 because for this new session on the standby, this is the first time the sequence is being accessed.
Therefore, the output for session 2 will be a output as 21 and b output as 1, which corresponds to Option C.
References: The behavior of global vs session-specific sequences is outlined in Oracle's SQL Language Reference under the CREATE SEQUENCE statement documentation.

質問 # 32
Which two statements are true regarding Data Guard environments in an Oracle Muti-tenant architecture?

A. Different redo transport methods can be configured for different pluggable databases within one Data Guard environment.
B. Standby redo log files are required for each pluggable database that is protected with Data Guard.
C. PDB_FILE_NAME CONVERT must be set to enable creation of standby databases if they are created on the same host as the primary.
D. A Data Guard environment with a multi-tenant primary database can operate in any Protection mode.
E. The Data Guard broker may be used for multi-tenant databases.

正解：D、E

解説：
Oracle Multi-tenant architecture and Data Guard have several interactions, but specific aspects hold true in such environments:
* The Data Guard broker may be used for multi-tenant databases (B): Data Guard Broker simplifies the management and monitoring of Data Guard configurations and is fully compatible with the Oracle Multi-tenant architecture, allowing for easy management of Data Guard configurations that include multi-tenant container databases (CDBs) and their pluggable databases (PDBs).
* A Data Guard environment with a multi-tenant primary database can operate in any Protection mode (E): Data Guard can be configured to operate in Maximum Performance, Maximum Availability, or Maximum Protection mode, regardless of whether the primary database is a multi-tenant database.
This flexibility ensures that Data Guard can meet various data protection and availability requirements in multi-tenant environments.References:
* Oracle Data Guard Broker documentation
* Oracle Multitenant Administrator's Guide

質問 # 33
Which two statements are true regarding Data Guard environments in an Oracle Muti-tenant architecture?

A. Different redo transport methods can be configured for different pluggable databases within one Data Guard environment.
B. Standby redo log files are required for each pluggable database that is protected with Data Guard.
C. PDB_FILE_NAME CONVERT must be set to enable creation of standby databases if they are created on the same host as the primary.
D. A Data Guard environment with a multi-tenant primary database can operate in any Protection mode.
E. The Data Guard broker may be used for multi-tenant databases.

正解：D、E

解説：
Oracle Multi-tenant architecture and Data Guard have several interactions, but specific aspects hold true in such environments:
The Data Guard broker may be used for multi-tenant databases (B): Data Guard Broker simplifies the management and monitoring of Data Guard configurations and is fully compatible with the Oracle Multi-tenant architecture, allowing for easy management of Data Guard configurations that include multi-tenant container databases (CDBs) and their pluggable databases (PDBs).
A Data Guard environment with a multi-tenant primary database can operate in any Protection mode (E): Data Guard can be configured to operate in Maximum Performance, Maximum Availability, or Maximum Protection mode, regardless of whether the primary database is a multi-tenant database. This flexibility ensures that Data Guard can meet various data protection and availability requirements in multi-tenant environments.
Reference:
Oracle Data Guard Broker documentation
Oracle Multitenant Administrator's Guide

質問 # 34
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