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Oracle 1z0-076 認定試験の出題範囲：

トピック	出題範囲
トピック 1	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.
トピック 2	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.
トピック 3	Managing Oracle Net Services in a Data Guard Environment: The section focuses on Oracle Net Services and its role in Data Guard networking setup.
トピック 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.
トピック 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.
トピック 7	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.
トピック 8	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.
トピック 9	Monitoring a Data Guard Broker Configuration: The topic covers the use of Enterprise Manager and DGMGRL to monitor Data Guard configurations and explains the various data protection modes available.
トピック 10	Managing Physical Standby Files After Structural Changes on the Primary Database: The topic covers managing structural changes in the primary database and their impact on physical standby files.
トピック 12	Enhanced Client Connectivity in a Data Guard Environment: This topic focuses on enhancing client connectivity in a Data Guard setup and implementing failover procedures for seamless client redirection. It also covers application continuity to ensure uninterrupted operations during role transitions.
トピック 13	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.

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Oracle Database 19c: Data Guard Administration 認定 1z0-076 試験問題 (Q108-Q113):

質問 # 108
Your Data Guard environment contains a four-instance RAC primary database whose SID is PROD and a RAC physical standby database whose std is PROD_SBY.
Examine the command executed on a node of the primary database cluster to create a service OLTPWORKLOAD that the applications will use to connect to the database when it is in the FRlMARYTclatabase role:
srvctl add service -db PROD -service oltpworkload -role PRIMARY -failovertype SESSION -failovermethod BASIC -failoverdelay 10 -failoverretry 150 The service is then started Consider this list of tasks:
1. On a node of the standby database cluster execute:
srvctl add service -db PROD_SBY -service oltpworkload -role PRIMARY -failovertype SESSION -failovermethod BASIC -failoverdelay 10 -failoverretry 150
2. On the primary database, create the oltpworkload database service using the dbms_service.create_service procedure.
3. Configure tap for clients in the tnsnames.ora files.
4. Make sure clients use the OLTPWORKLOAD service to connect to the database instances.
5. On the standby database, create the oltpworkload database service using the dbms_service.create_servi;l procedure.
Identify the required steps to configure and use Transparent Application Failover (taf).

A. 1.4
B. 2,3,4
C. 1,3,4
D. 0
E. 1
F. 3,4

正解：A

解説：
To set up Transparent Application Failover (TAF) in a Data Guard environment with RAC, you would need to:
On a node of the standby database cluster, execute the srvctl command to add the oltpworkload service for the PRIMARY role (1): This prepares the standby cluster to provide the oltpworkload service in case a failover occurs, and the standby becomes the primary database.
Make sure clients use the OLTPWORKLOAD service to connect to the database instances (4): This ensures that client connections are directed to the correct service, which is managed by TAF and can fail over in case of a primary database outage.
Reference:
Oracle Real Application Clusters Administration and Deployment Guide
Oracle Data Guard Concepts and Administration Guide

質問 # 109
Which statement is true regarding Oracle Net connectivity for a Data Guard Broker configuration?

A. A TNS entry enabling connectivity to the primary database instance must be defined on each of the standby database hosts.
B. The LOCAL_LISTENER initialization parameter must be set to the listener used to register the primary database instance.
C. A TNS entry or entries enabling connectivity to standby database instance(s) must be defined on the primary database host.
D. To start SQL Apply on a logical standby database, a TNS entry enabling connectivity to the primary database instance must be defined on the logical standby database host.
E. To enable Real-Time Query on a physical standby database, a TNS entry enabling connectivity to the standby database instance must be defined on the primary database host.

正解：C

質問 # 110
Which four statements are true regarding SQL Apply filters for a logical standby database?

A. They can be used to skip execution of DML triggers on a table while allowing the DML to execute.
B. They can be used to skip all SQL statements executed on a specific pluggable database (PDB) within a standby multitenant container database (CDB).
C. They can be used to skip ALTER TABLE commands on specific tables.
D. They can be used to skip CREATE TABLE commands.
E. They can only be used to skip DML statements on a table.
F. They can be used to skip ALTE1 STEM and ALTER DATABASE commands.
G. They can be used to stop SQL apply if it encounters an error.

正解：A、C、D、F

解説：
Based on the Oracle Database 19c documentation, the correct answers about SQL Apply filters for a logical standby database are:
A). They can be used to skip execution of DML triggers on a table while allowing the DML to execute.
B). They can be used to skip CREATE TABLE commands.
C). They can be used to skip ALTER SYSTEM and ALTER DATABASE commands.
G). They can be used to skip ALTER TABLE commands on specific tables.
Comprehensive Detailed Explanation:
SQL Apply filters in a logical standby database can be set to control which SQL operations are applied to the standby. These filters allow for certain commands to be skipped, ensuring that they do not impact the standby database. For example, filters can be used to skip the execution of DML triggers to prevent them from firing during SQL Apply, while still allowing the underlying DML to be executed on the logical standby database. This is particularly useful when certain triggers are not desired to run in a standby environment. CREATE TABLE, ALTER SYSTEM, ALTER DATABASE, and specific ALTER TABLE commands can also be skipped using SQL Apply filters to prevent unwanted structural changes or administrative operations from affecting the logical standby database. These capabilities provide a level of control to ensure that the logical standby database reflects only the desired state of the primary database.
Reference:
Oracle Database SQL Language Reference and Oracle Data Guard Concepts and Administration guide offer comprehensive details on the use of SQL Apply filters, including the range of SQL statements that can be influenced by these filters in a logical standby database environment.

質問 # 111
Active Data Guard (ADG) databases are widely used to offload reporting or ad hoc query-only jobs from the primary database. Reporting workload profile is different from the primary database and often requires tuning.
Which tool is used to tune SQL workloads running on an ADG database?

A. Standby Statspack
B. SQL Tuning Advisor
C. Automatic Diagnostic Database Monitor (ADDM)
D. Automatic Workload Repository (AWR)
E. In-Memory Active Session History (ASH)

正解：D

解説：
AWR collects, processes, and maintains performance statistics for problem detection and self-tuning purposes. In an Active Data Guard environment, where the physical standby database can be used for read-only workloads, AWR can be instrumental in identifying performance bottlenecks and areas for optimization. It provides detailed reports that include wait events, time model statistics, and active session history, making it an invaluable tool for tuning SQL queries and overall database performance in an ADG setup.

質問 # 112
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?
A)

B)

C)

A. Option D
B. Option C
C. Option B
D. Option A

正解：B

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.

質問 # 113
......

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