合格させる試験完全版1z1-076問題集111解答
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質問 # 32
In Oracle Database 19c, you can set the value of database initialization parameters in a database using the EDIT DATABASE... SET PARAMETER Command:
DGMGRL> EDIT DATABASE 'boston' SET PARAMETER log_archive_trace - 1;
Which THREE statements are TRUE about the command?
- A. The EDIT DATABASE PARAMETER command can be used to set the value of a static parameter in a database.
- B. The value set using this command is directly applied to the boston database.
- C. The value set using this command is directly stored in the broker configuration file.
- D. The edit database parameter command can only be used to modify the value of a dynamic parameter in a database.
- E. The database must be available when the above command is run.
正解：B、D、E
解説：
The EDIT DATABASE...SET PARAMETER command in Data Guard Management (DGMGRL) is used to modify the value of initialization parameters for a database within a Data Guard configuration. This command can be used to modify both static and dynamic parameters, but if a static parameter is changed, the new value will take effect only after the database is restarted. The database must be up and running for the command to execute, and the values set using the command are directly applied to the specified database (in this case,
'boston') .
質問 # 33
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. Many SQL apply operations do full table scans
- B. An undersized shared pool
- C. An undersized undo tablespace on the logical standby
- D. An increased number of bulk inserts on the primary
- E. An increased number of bulk updates on the primary
- F. The standby redo log files are undersized on the primary database
正解：A、B、C、E
解説：
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.
References: Oracle Database High Availability Overview and Oracle Data Guard Concepts and Administration guide provide insights into the factors affecting SQL apply performance on logical standby databases.
質問 # 34
Which TWO statements correctly describe the behavior of Automatic Block Media Recovery in a Data Guard environment, for a corrupt block in the example tablespace encountered by a session logged in as the SH user?
- A. A corrupt block on the primary database is automatically recovered, using a block from a flashback log from a standby database with Real-Time Query enabled.
- B. A corrupt block on a standby database with Real-Time Query enabled, is automatically recovered, using flashback logs from the standby database.
- C. A corrupt block on the primary database can be automatically recovered, using a block from a standby database with Real-Time Query enabled.
- D. A corrupt block on the primary database is automatically recovered, using a block from a flashback log from the primary database.
- E. A corrupt block on a standby database with Real-Time Query enabled, can be automatically recovered, using a block from the primary database.
正解：C、D
解説：
Automatic Block Media Recovery can be a significant feature for maintaining data integrity within a Data Guard configuration.
* A corrupt block on the primary database can be automatically recovered, using a block from a standby database with Real-Time Query enabled (A): When a corrupted block is encountered on the primary database, Oracle can automatically replace it with a good block from the standby database where Real-Time Query is enabled, leveraging the standby as a source of good data.
* A corrupt block on the primary database is automatically recovered, using a block from a flashback log from the primary database (E): If a good block version is available in the flashback logs of the primary database, Automatic Block Media Recovery can use it to recover the corrupted block on the primary.References:
* Oracle Database Backup and Recovery User's Guide
質問 # 35
You must design an Oracle Data Guard configuration for a DSS database that meets these permanent requirements:
1. Creating and maintaining bitmap indexes should not impact the performance of the primary database.
2. Creating and maintaining materialized views should not impact the performance of the primary database.
Additionally, there are these requirements, only one of which is ever done at any one time:
1. It should be possible to apply designated patches with a minimum amount of downtime.
2. Upgrading to a new database release should be performed with the least possible amount of downtime.
3. New application software releases should be tested against an exact and up-to-date replica of the primary database.
Which configuration meets these requirements with the fewest of databases?
- A. a primary database with one physical standby database
- B. a primary database with two physical standby databases
- C. A primary database with one logical and one physical standby database
- D. a primary database with one logical standby database
- E. a primary database with two logical standby databases
正解：D
解説：
* Logical standby databases allow the execution of DDL and DML operations, which makes them suitable for maintaining bitmap indexes and materialized views without affecting the performance of the primary database .
* Logical standby databases can be used for performing rolling upgrades and patching with minimum downtime, meeting another requirement .
* They also enable the testing of new application software releases against an up-to-date replica of the primary database, fulfilling the last requirement.
Other configurations involving physical standby databases or combinations of logical and physical standby databases might not meet all the specified requirements as efficiently or with the same level of performance isolation for the primary database.
質問 # 36
Your Data Guard environment contains a primary database and three standby databases with these attributes:
1. prod : Primary database
2. prod_prq : Physical standby database with real-time query enabled used by reporting applications
3. prod_lsby: Logical standby database used by DSS
4. PROD_SSBY: Snapshot standby database used for Real Application Testing Which TWO can be used to prevent clients from connecting to the wrong database instance?
- A. Create database services for each database and use event triggers to make sure that services are activated only when the database is in the correct role.
- B. Create a static service for each of the databases, register it with the local listener of each database instance, and add connection descriptors on clients to connect to those services.
- C. Establish Oracle Net connectivity to the primary database instance from all the standby database instances.
- D. Create database services on each of the standby databases, start the services, and add connection descriptors on the clients to connect to those services.
- E. Create role based services with the si vet] utility when using clusterware for Oracle RAC databases or Oracle Restart for single instance Oracle databases.
正解：A、D
解説：
Creating dedicated database services for each database instance (Option D) and utilizing event triggers to manage these services based on the role of the database (Option E) ensure that clients connect to the appropriate database instance based on its current role and state. This approach leverages the flexibility and control provided by Oracle Net services and database event management to direct client connections to the suitable primary or standby instance, enhancing the overall robustness and reliability of the Data Guard environment. Reference: Based on Oracle Database 19c best practices for managing connectivity and services in a Data Guard setup, including the use of role-based services and event-driven service management.
質問 # 37
Examine the Data Guard configuration: DGMGRL> show configuration;
Configuration - Animals
Protection Mode: MaxPerformance
Databases:
dogs- Primary database
sheep - Physical standby database
cats- Snapshot standby database
Fast-Start Failover: DISABLED
Configuration Status: SUCCESS
You receive an error while attempting to raise the protection mode to Maximum Protection:
DGMGRL> edit configuration set protection mode as maxprotection;
Error: ORA-16627: operation disallowed since no standby databases would remain to support protection mode Failed.
What can you conclude based on this error?
- A. Cats is a snapshot standby database.
- B. The redo transport mode is set to async for the standby database Sheep.
- C. The redo transport mode is set to async for both standby databases.
- D. The redo transport mode is set to asyn: for the standby database Cats.
正解：A
解説：
The error indicates that switching the protection mode to Maximum Protection is not possible due to the presence of a snapshot standby database in the Data Guard configuration, which cannot participate in synchronous redo transport required by the Maximum Protection mode. Therefore, the correct answer is:
* D. Cats is a snapshot standby database.
Comprehensive Detailed Explanation:In an Oracle Data Guard environment, the Maximum Protection mode requires that all redo data be transmitted synchronously to at least one standby database, ensuring no data loss even in the event of a primary database failure. However, a snapshot standby database, by its nature, allows read-write access and is temporarily disconnected from the redo stream, which makes it unable to participate in the synchronous redo transport required by Maximum Protection mode. The presence of a snapshot standby database in the Data Guard configuration thus prevents the activation of Maximum Protection mode, as it cannot guarantee zero data loss without a standby database capable of receiving redo data synchronously.
References:Oracle Data Guard documentation clearly outlines the requirements and restrictions of different protection modes, including the necessity for standby databases to participate in synchronous redo transport to enable Maximum Protection mode. The inability of snapshot standby databases to fulfill this requirement is a key consideration when planning Data Guard configurations and protection levels.
質問 # 38
Which three statements are true about snapshot standby databases?
- A. A resize command to extend the size of a datafile in the snapshot standby database, which was created in the snapshot standby database, will succeed.
- B. A resize command to reduce the size of an empty datafile in the snapshot standby database, which was created in the primary database, will succeed.
- C. A resize command to reduce the size of an empty datafile in the snapshot standby database, which was created in the snapshot standby database, will succeed.
- D. A resize command to reduce the size of an empty datafile in the snapshot standby database, which was created in the physical standby database, will succeed.
- E. A resize command to extend the size of a datafile in the snapshot standby database, which was created in the primary database, will succeed.
正解：A、C、E
質問 # 39
Examine the following parameter settings of the physical standby database:
* STANDBY_FILE_MANAGEMENT=AUTO
* ENABLED_PDBS_ON_STANDBY=<null>
During which TWO tasks are files automatically created in the physical standby database after structure changes on the primary database?
- A. Performing transportable tablespaces
- B. Renaming a data file in the primary database
- C. Adding a data file or creating a tablespace
- D. Adding or dropping a redo file group
- E. Creating a PDB from the existing PDB within the same CDB
正解：C、E
解説：
When STANDBY_FILE_MANAGEMENT is set to AUTO, the Oracle Data Guard automatically creates, deletes, and renames files on the standby database to match the changes made on the primary database. The tasks that lead to the automatic creation of files on the standby include:
* Adding a data file or creating a tablespace (C): When a new tablespace is created or a new data file is added on the primary database, the standby database automatically replicates this action, maintaining structural consistency with the primary database.
* Creating a PDB from the existing PDB within the same CDB (D): Creating a new Pluggable Database (PDB) within a Multitenant Container Database (CDB) on the primary database triggers an automatic creation of the corresponding PDB within the standby CDB.References:
* Oracle Data Guard Concepts and Administration Guide
質問 # 40
Which three actions are performed by the START PLAN procedure of the DBMS ROLLING package?
- A. switching the primary database to the logical standby role
- B. starting media recovery on all the Leading Group Standby databases
- C. converting the designated physical standby database into a logical standby database
- D. creating a guaranteed restore point on the primary database
- E. building a LogMiner dictionary on the primary database instance
- F. creating a guaranteed restore point on the standby databases
正解：D、E、F
解説：
The DBMS_ROLLING package facilitates a rolling upgrade process across a Data Guard configuration. The START PLAN procedure in particular handles several critical actions, including:
Creating a guaranteed restore point on the standby databases (B): This ensures that the standby databases can be reverted to their state before the rolling upgrade process in case of any issues.
Building a LogMiner dictionary on the primary database instance (C): This is necessary for logical standby databases to interpret redo data during the SQL Apply process.
Creating a guaranteed restore point on the primary database (D): Similar to the standby databases, this ensures that the primary database can be reverted to a known good state if necessary.
Reference:
Oracle Database PL/SQL Packages and Types Reference
Oracle Data Guard Concepts and Administration Guide
質問 # 41
Which TWO statements are true for Data Guard environments with multi-tenant databases?
- A. The CDBDBA privilege must be used instead of the SYSDBA privilege for connections as SYS to the root container of a multi-tenant standby database.
- B. The Data Guard broker automatically always opens the pluggable databases of a standby database after a role change operation.
- C. Different pluggable databases within a logical standby database may have different guard statuses.
- D. The Data Guard broker automatically opens all pluggable databases of a primary database after a role change operation.
- E. A multi-tenant standby database can have fewer pluggable databases than the primary container database.
正解：C、E
質問 # 42
You are licensed to use Oracle Active Data Guard.
Which TWO statements are true after enabling block change tracking on a physical standby database?
- A. It allows fast incremental backups to be offloaded to a snapshot standby database, when the physical standby database is converted.
- B. It allows fast incremental backups to be offloaded to the physical standby database.
- C. It starts the CTWR process on the primary database instance.
- D. It allows fast incremental backups to be taken on the primary database.
- E. It starts the CTWR process on the physical standby database instance.
- F. It starts the RVWR process on the physical standby database instance.
正解：B、F
解説：
Block change tracking is a feature that enhances the efficiency of incremental backups by recording changed blocks in a tracking file. When used with Oracle Active Data Guard:
* It starts the RVWR process on the physical standby database instance (A): When block change tracking is enabled on a physical standby database, the Recovery Writer (RVWR) process is initiated.
This process is responsible for recording the changes to blocks in the block change tracking file, which is then used to optimize incremental backups.
* It allows fast incremental backups to be offloaded to the physical standby database (E): With block change tracking enabled on the physical standby database, fast incremental backups can be offloaded from the primary database. This reduces the workload on the primary database and utilizes the standby database for backup operations, improving overall system performance and efficiency.References:
* Oracle Database Backup and Recovery User's Guide
* Oracle Active Data Guard documentation
質問 # 43
Examine the Data Guard configuration:
DGMGRL> show configuration;
Configuration - Animals
Protection Mode: MaxAvailability
Databases:
dogs - Primary database
cats - Snapshot standby database
sheep - Snapshot standby database
Fast-Start Failover: DISABLED
Configuration Status:
ORA-01034: ORACLE not available
ORA-16625: cannot reach database "dogs"
DGM-17017: unable to determine configuration status
ou wish to perform a failover to sheep. Which command, or sequence of commands, should you issue to the broker before executing failover to sheep; using the broker?
- A. DGMGRL> convert database cats to physical standby;
- B. DGMGRL> convert database cats to physical standby;
- C. DGMGRL> convert database sheep to physical standby;
- D. None, because you can directly failover to a Snapshot Standby Database.
- E. DGMGRL> convert database sheep to physical standby;
DGMGRL> edit configuration set protection mode as maxperformance;
DGMGRL> convert database sheep to physical standby;
正解：C
質問 # 44
You must configure flashback database for your Oracle 19c databases that will be part of a Data Guard Broker configuration.
The databases are all in ARCHIVELOG mode.
You will execute the SQL statement:
ALTER DATABASE FLASHBACK ON;
Which three are true concerning this command?
- A. If executed successfully on an Oracle 19c primary database, flashback will also be enabled on all physical standby databases that are part of the configuration.
- B. It will execute successfully while an Oracle 19c primary database is open.
- C. It will execute successfully on an Oracle 19c physical standby database while Real Time Query is active.
- D. It will execute successfully on an Oracle 19c logical standby database while SQL apply is active.
- E. It will execute successfully while an Oracle 19c primary database is mounted.
- F. If executed successfully on an Oracle 19c primary database, flashback will also be enabled on all logical standby databases that are part of the configuration.
正解：B、D、E
解説：
The command ALTER DATABASE FLASHBACK ON; enables the Flashback Database feature, which provides a way to quickly revert an entire Oracle database back to a previous point in time. This command can be executed while an Oracle 19c primary database is either open (option A) or mounted (option B). It is also applicable to an Oracle 19c logical standby database while SQL Apply is active (option E). However, it's important to note that enabling Flashback Database on the primary does not automatically enable it on all associated standby databases, whether they are physical or logical. Each database in a Data Guard configuration must have Flashback Database explicitly enabled if desired. Real Time Query being active on a physical standby does not directly relate to the ability to execute this command on the standby. Reference: The explanation is based on Oracle's concepts for Flashback Technology and Data Guard configurations as detailed in the Oracle Database Backup and Recovery User's Guide and the Oracle Data Guard Concepts and Administration guide.
質問 # 45
Which TWO statements are true regarding Data Guard Broker?
- A. It can be used to perform failovers and switchovers.
- B. It can be used to monitor redo transport and log apply services.
- C. It automatically adds the primary database to an existing broker configuration when Enterprise Manager Cloud Control is used to create a standby.
- D. It automatically starts the DMON process for the database instances that are part of a Data Guard configuration.
- E. It can be used to create and manage standby databases.
正解：A、E
質問 # 46
Examine the Data Guard configuration:
Which three will be true after a successful failover to Cats?
- A. Sheep will be in the enabled state.
- B. The configuration will be in Maximum Availability mode.
- C. The configuration will be in Maximum Performance mode.
- D. Sheep will be in the disabled state.
- E. Dogs will be in the disabled state and has to be manually reinstated.
正解：A、B、E
解説：
After a successful failover to the 'cats' database in a Data Guard configuration:
* B: Sheep, being another standby database, would typically remain in the enabled state unless specifically disabled or if there was a configuration issue.
* D: Dogs, which was the primary database prior to failover, will be in a disabled state as part of the failover process. Manual intervention is required to re-establish 'dogs' as a standby database or to return it to the primary role through another role transition.
* E: If the configuration was in Maximum Availability mode before failover, it would remain in this mode after failover, provided all settings were properly configured and no changes were made to the protection mode.
Option A is incorrect because failover does not automatically change the protection mode to Maximum Performance. The protection mode remains as it was prior to the failover unless manually altered.
References: The behavior of Oracle Data Guard during failover and the resulting configuration state is described in the Oracle Data Guard Broker documentation.
質問 # 47
Which statement is true regarding Oracle Net connectivity for a Data Guard Broker configuration?
- A. 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.
- B. A TNS entry or entries enabling connectivity to standby database instance(s) must be defined on the primary database host.
- C. 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.
- D. A TNS entry enabling connectivity to the primary database instance must be defined on each of the standby database hosts.
- E. The LOCAL_LISTENER initialization parameter must be set to the listener used to register the primary database instance.
正解：B
質問 # 48
Your Data Guard environment contains a primary database and three standby databases with these attributes:
1. prod : Primary database
2. prod_prq : Physical standby database with real-time query enabled used by reporting applications
3. prod_lsby: Logical standby database used by DSS
4. PROD_SSBY: Snapshot standby database used for Real Application Testing Which TWO can be used to prevent clients from connecting to the wrong database instance?
- A. Create database services for each database and use event triggers to make sure that services are activated only when the database is in the correct role.
- B. Create a static service for each of the databases, register it with the local listener of each database instance, and add connection descriptors on clients to connect to those services.
- C. Establish Oracle Net connectivity to the primary database instance from all the standby database instances.
- D. Create database services on each of the standby databases, start the services, and add connection descriptors on the clients to connect to those services.
- E. Create role based services with the si vet] utility when using clusterware for Oracle RAC databases or Oracle Restart for single instance Oracle databases.
正解：A、D
解説：
Creating dedicated database services for each database instance (Option D) and utilizing event triggers to manage these services based on the role of the database (Option E) ensure that clients connect to the appropriate database instance based on its current role and state. This approach leverages the flexibility and control provided by Oracle Net services and database event management to direct client connections to the suitable primary or standby instance, enhancing the overall robustness and reliability of the Data Guard environment. References: Based on Oracle Database 19c best practices for managing connectivity and services in a Data Guard setup, including the use of role-based services and event-driven service management.
質問 # 49
Examine the Data Guard configuration:
What happens if you issue "switchover to sheep;" at the DGMGRL prompt?
- A. The switchover succeeds and Cats becomes the new failover target.
- B. The switchover succeeds but Dogs needs to be reinstated.
- C. It results in an error indicating that a switchover is not allowed.
- D. The switchover succeeds and Dogs becomes the new failover target.
- E. The switchover succeeds and Fast-Start Failover is suspended.
正解：D
解説：
When issuing a "switchover to sheep;" command in a Data Guard configuration, the primary database (Dogs) transitions to a standby role, and the target standby database (Sheep) becomes the new primary database.
Fast-Start Failover (FSFO) remains enabled, but its target changes according to the new roles of the databases.
Since Cats is also a physical standby database, it does not become the failover target by default unless it is specified in the broker configuration. After the switchover, the original primary (Dogs) becomes the new standby database and thus the new failover target for FSFO.References:Oracle Data Guard Broker documentation provides detailed procedures and explanations of switchover operations, including how FSFO targets are affected post-switchover. This behavior is consistent across different Oracle Database versions that support Data Guard and FSFO.
質問 # 50
Which two are prerequisites for configuring flashback database for Oracle 19c databases, in a Data Guard environment?
- A. The database must be in ARCHTVELOG mode.
- B. The Data Guard real-time apply feature must be enabled.
- C. The data guard broker must be used.
- D. A far sync instance must be configured to flash back a standby when the primary has been flashed back.
- E. A fast recovery area must be configured.
正解：A、E
解説：
* A fast recovery area must be configured (B): Flashback Database requires a fast recovery area to be set up because flashback logs are stored there. The fast recovery area is a unified storage location for all recovery-related files and activities.
* The database must be in ARCHIVELOG mode (C): Flashback Database operation relies on the ability to archive redo logs. Therefore, the database must be running in ARCHIVELOG mode for Flashback Database to be enabled.
References:
* Oracle Database Backup and Recovery User's Guide
* Oracle Data Guard Concepts and Administration Guide
質問 # 51
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