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NEW QUESTION # 21
Which THREE statements are true about snapshot standby databases?
- A. FLASHBACK DATABASE must be manually enabled on a physical standby database before converting it into a snapshot standby database.
- B. A snapshot standby database can have Real-Time apply enabled.
- C. FLASHBACK DATABASE is enabled automatically on a physical standby database as part of the conversion into a snapshot standby database, if not already enabled.
- D. A snapshot standby database may be opened read-only.
- E. A snapshot standby database may be opened read-write.
- F. FLASHBACK DATABASE is enabled automatically on a snapshot standby database after converting it from a physical standby database if not already enabled.
Answer: C,E,F
Explanation:
Snapshot standby databases are a feature of Oracle Data Guard that allows a physical standby database to be temporarily converted into a read-write database for testing or other purposes. The true statements about snapshot standby databases are:
* FLASHBACK DATABASE is enabled automatically on a snapshot standby database after converting it from a physical standby database if not already enabled (B): When a physical standby is converted to a snapshot standby, FLASHBACK DATABASE is automatically enabled to allow the database to be easily reverted back to its original state.
* FLASHBACK DATABASE is enabled automatically on a physical standby database as part of the conversion into a snapshot standby database, if not already enabled (C): As part of the conversion process, FLASHBACK DATABASE is turned on to ensure that changes made while the database is in snapshot standby mode can be undone.
* A snapshot standby database may be opened read-write (E): Once a physical standby is converted to a snapshot standby, it can be opened for read-write operations, allowing for testing and other tasks that require a writable database.
References:
* Oracle Data Guard Concepts and Administration
* Oracle Database Backup and Recovery User's Guide
NEW QUESTION # 22
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. Establish Oracle Net connectivity to the primary database instance from all the standby database instances.
- B. 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.
- C. 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.
- D. Create role based services with the si vet] utility when using clusterware for Oracle RAC databases or Oracle Restart for single instance Oracle databases.
- E. Create database services on each of the standby databases, start the services, and add connection descriptors on the clients to connect to those services.
Answer: B,E
Explanation:
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.
NEW QUESTION # 23
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 taken on the primary database.
- B. It starts the RVWR process on the physical standby database instance.
- C. It starts the CTWR process on the physical standby database instance.
- D. It starts the CTWR process on the primary database instance.
- E. It allows fast incremental backups to be offloaded to the physical standby database.
- F. It allows fast incremental backups to be offloaded to a snapshot standby database, when the physical standby database is converted.
Answer: B,E
Explanation:
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.
Reference:
Oracle Database Backup and Recovery User's Guide
Oracle Active Data Guard documentation
NEW QUESTION # 24
Which two are true concerning the configuring of Flashback database in a Data Guard environment?
- A. It permits a primary database that was disabled after failover to be reinstated as a standby.
- B. It is required in order for a snapshot standby database to be converted to a physical standby database.
- C. It is a prerequisite for the use of Fast Start Failover.
- D. It permits a physical standby database to be converted to a snapshot standby database.
- E. It enables the use of far sync instances.
Answer: A,D
NEW QUESTION # 25
You are planning to perform block comparison using the dbms comp package:
Which TWO statements are true?
- A. You can monitor the progress of an ongoing block comparison operation by querying VS SES SION_LONGOPS.
- B. Logical standby databases can be the target database for the dbms_dbcomp.dbcomp procedure.
- C. The databases should be at least mounted before block comparison.
- D. It can be used to detect lost writes and inconsistencies between the primary database and the cascaded standbys.
- E. It requires that the DB_LOST_WKITE_protect initialization parameter be enabled.
Answer: A,C
Explanation:
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.
NEW QUESTION # 26
Which three Data Guard monitoring activities may be performed using Enterprise Manager Cloud Control?
- A. You can set a critical threshold on the redo generation rate metric for a primary database.
- B. You can check if redo apply needs to be tuned.
- C. You can check the potential data loss in the event of a disaster.
- D. You can monitor the redo apply rate on a snapshot standby database.
- E. You can monitor the redo apply rate on a logical standby database.
- F. You can set a warning threshold on the redo generation rate metric for a physical standby database.
Answer: A,C,E
NEW QUESTION # 27
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. Dogs will be in the disabled state and has to be manually reinstated.
- C. The configuration will be in Maximum Performance mode.
- D. Sheep will be in the disabled state.
- E. The configuration will be in Maximum Availability mode.
Answer: A,B,E
Explanation:
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.
NEW QUESTION # 28
Which THREE are true about using flashback database in a Data Guard environment?
- A. You can use it when real-time apply is enabled in case the physical standby suffers from logical corruption.
- B. It may be used to flash back a physical standby that receives redo from a far sync instance.
- C. You can use it when real-time apply is enabled in case the phylt may not be used to flash back a primary database after a failover to a logical standby.
- D. When a flashback database operation is performed on a primary database, a physical standby database is also flashed back automatically.
- E. It may not be used to flash back a primary database after a failover to a physical standby.
- F. When a flashback database operation is performed on a primary database, a logical standby database is also flashed back automatically.
Answer: A,B,E
Explanation:
Flashback Database is a feature that allows reverting a database to a previous point in time, which is extremely useful in various Data Guard configurations:
It may be used to flash back a physical standby that receives redo from a far sync instance (C): Flashback Database can be used on a physical standby database to revert it to a past point in time, even when it is receiving redo data from a far sync instance. This can be particularly useful to recover from logical corruptions or unwanted changes.
You can use it when real-time apply is enabled in case the physical standby suffers from logical corruption (D): Even when real-time apply is enabled, which allows redo data to be applied to the standby database as soon as it is received, Flashback Database can be used to revert the physical standby database to a point in time before the logical corruption occurred.
It may not be used to flash back a primary database after a failover to a physical standby (E): After a failover has occurred from a primary to a physical standby database, making the standby the new primary, Flashback Database cannot be used to revert the old primary database to a state before the failover because the failover operation makes irreversible changes to the database role and configuration.
Reference:
Oracle Database Backup and Recovery User's Guide
Oracle Data Guard Concepts and Administration
NEW QUESTION # 29
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 database must be available when the above command is run.
- 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 be used to set the value of a static parameter in a database.
- E. The edit database parameter command can only be used to modify the value of a dynamic parameter in a database.
Answer: A,B,E
Explanation:
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') .
NEW QUESTION # 30
Which three actions are performed by the START PLAN procedure of the DBMS ROLLING package?
- A. converting the designated physical standby database into a logical standby database
- B. building a LogMiner dictionary on the primary database instance
- C. switching the primary database to the logical standby role
- D. creating a guaranteed restore point on the primary database
- E. creating a guaranteed restore point on the standby databases
- F. starting media recovery on all the Leading Group Standby databases
Answer: B,D,E
Explanation:
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
NEW QUESTION # 31
You must configure an Oracle Data..........
1. A primary database
2. A physical standby database
Examine these requirements: 1. Data loss is not permitted.
1. Data loss is not permitted.
2. It should be possible to convert the physical standby database to a snapshot standby database.
3. Under normal operations, transactions should commit when redo is written to disk on the primary database and as soon as it has been received by the standby database instance.
4. The availability of the primary database should not be compromised by the availability of the standby database.
5. It should be possible to convert the physical standby database to a logical standby database
6. It should be possible to deploy Real Application Clusters on the primary database.
7. It should be possible to deploy Real Application Clusters on the physical standby database.
You configure SYNC redo transport mode in combination with Maximum Protection mode.
- A. 1, 6, and 7
- B. 1, 2, 3, 4, 5, 6, and 7
- C. 1, 2, and 5
- D. 1, 2, 3, 6, and 7
- E. 1, 2, 6, and 7
Answer: B
Explanation:
When SYNC redo transport mode is combined with Maximum Protection mode, it ensures that no data loss will occur (requirement 1). The physical standby can be converted to a snapshot standby (requirement 2) and later to a logical standby database (requirement 5), satisfying both transformation requirements. Transactions commit as soon as redo data is received by the standby database (requirement 3). The availability of the primary is not dependent on the standby database in Maximum Protection mode, as the primary database will halt if the standby cannot acknowledge the redo (requirement 4), thus indirectly ensuring its availability. It is also possible to deploy Real Application Clusters on both the primary (requirement 6) and the physical standby database (requirement 7), providing high availability and scalability.
ReferencesOracle Data Guard documentation detailing the requirements for different database roles, protection modes, and redo transport modes, as well as the capabilities and limitations of each configuration.
NEW QUESTION # 32
You are using Data Guard in conjunction with Global Database Services.
You have a Data Guard Broker configuration called Sales and a GDS pool called Prod.
Which three are true concerning the management of the broker configuration when using GDS?
- A. Adding a database to the Sales configuration with DGMGRL requires that the Sales configuration be disabled first. It must then be enabled after the new database is added to the configuration.
- B. Adding a database to the Sales configuration with DGMGRL automatically adds the database to the Prod Pool.
- C. DGMGRL may be used to add the Sales configuration to the Prod pool in gds.
- D. DGMGRL may be used to add a single database to the Sales configuration even if Sales is a member of the Prod pool.
- E. Performing a role change with DGMGRL automatically notifies GDS which in turn activates the appropriate services.
Answer: C,D,E
Explanation:
In the context of Oracle Data Guard and Global Database Services (GDS):
* DGMGRL may be used to add the Sales configuration to the Prod pool in gds (A): Data Guard Broker's command-line interface DGMGRL can be utilized to manage configurations with GDS, allowing the addition of Data Guard Broker configurations to GDS pools.
* Performing a role change with DGMGRL automatically notifies GDS which in turn activates the appropriate services (B): When a role change is executed using DGMGRL, GDS is automatically notified, and it then activates the services that are appropriate for the new database roles.
* DGMGRL may be used to add a single database to the Sales configuration even if Sales is a member of the Prod pool (C): DGMGRL provides the capability to manage individual databases within a broker configuration, including adding databases to a configuration that is already part of a GDS pool.References:
* Oracle Data Guard Broker documentation
* Oracle Global Data Services documentation
NEW QUESTION # 33
Your Data Guard configuration consists of these components and settings:
1. A primary database
2. A remote physical standby database
3. Real-time query is enabled
4. Redo transport mode is synchronous
5. Protection mode is maximum availability
6. The Data Guard broker is used
You notice that the standby destination fails to acknowledge reception of redo within net_timeout period of time.
Which is true in this scenario?
- A. Synchronous redo transport mode connections to the standby database are terminated.
- B. Real-time query will be disabled on the physical standby.
- C. The protection mode will automatically change to Maximum Performance.
- D. The physical standby database instance is shut down by the Data Guard broker.
Answer: A
Explanation:
In a Data Guard configuration where the protection mode is set to Maximum Availability and synchronous redo transport is enabled, if the standby destination fails to acknowledge the reception of redo within the net_timeout period, the primary database will terminate the synchronous redo transport mode connections to the standby database to protect the primary database from hanging (C). The primary database then operates in a Maximum Performance mode until the issue is resolved. This behavior ensures that the primary database can continue to process transactions even when the standby database is temporarily unavailable.
References:The Oracle Data Guard Broker documentation and Oracle Data Guard Concepts and Administration guide detail the behavior of different protection modes and the response to network timeouts, including the fallback to asynchronous redo transport to maintain primary database availability.
NEW QUESTION # 34
Which THREE statements are TRUE about the supported workload in Active Data Guard standby databases?
- A. You might have to use sequences with global temporary tables to support read-mostly applications by using Active Data Guard.
- B. The DDL operations on private temporary tables are transparently redirected to the primary database.
- C. PL/SQL blocks that you run on Active Data Guard standby databases can be always redirected to and run on the primary database.
- D. The DML operations on a standby can be transparently redirected to and run on the primary database
- E. Read-mostly reporting applications that use global temporary tables for storing temporary data can be offloaded.
Answer: A,D,E
Explanation:
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.
NEW QUESTION # 35
Your current Data Guard environment consists of:
A primary database containing no abstract data types used for user tables.
Two separate remote physical standby databases used for reporting.
Examine these requirements for adding a new standby database to this Data Guard environment:
The new standby database must provide a disaster recovery solution.
There must be minimal additional performance overheads on the primary database.
The new standby database may require additional indexes and materialized views not present in the primary.
New tables or schemas may be required in the standby database that are not present in the primary.
What would you recommend to fulfill these requirements?
- A. A logical standby database with synchronous redo transport and redo apply on.
- B. A physical standby database with synchronous redo transport and Real-Time Query enabled.
- C. A physical standby database with asynchronous redo transport and Real-Time Query enabled.
- D. A logical standby database with synchronous redo transport and SQL apply on.
- E. A logical standby database with asynchronous redo transport and SQL apply on.
Answer: E
NEW QUESTION # 36
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 sheep to physical standby;
- B. DGMGRL> convert database cats to physical standby;
- C. DGMGRL> convert database cats 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;
Answer: A
NEW QUESTION # 37
Which TWO observations are true about the Far Sync instance?
- A. Can be created using the RMAN DUPLICATE command
- B. Can only be created using a series of SQL commands
- C. Applies redo received
- D. Receives redo synchronously from the primary database
- E. Includes a standby control file, password file, data files, standby redo logs, and archive logs
Answer: C,D
Explanation:
A Far Sync instance is a special kind of Oracle Data Guard configuration that allows synchronous redo transport from a primary database to a remote standby database with minimum impact on the primary database's performance. The Far Sync instance receives redo data synchronously from the primary database (A), then ships it asynchronously to the remote standby database, thus extending zero data loss protection over longer distances and higher network latency environments than would be practical with a synchronous standby alone. The Far Sync instance does not apply the redo data; it just receives and ships it (E). A Far Sync instance does not have data files, and it cannot apply redo to stay synchronized with the primary database.
Reference:
Oracle Database High Availability Overview and Oracle Data Guard Concepts and Administration documentation detail the role and configuration of Far Sync instances, including how they contribute to achieving zero data loss disaster recovery over long distances.
NEW QUESTION # 38
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 the primary database.
- B. A corrupt block on the primary database can be automatically recovered, using a block from a standby database with Real-Time Query enabled.
- C. A corrupt block on a standby database with Real-Time Query enabled, is automatically recovered, using flashback logs from the standby database.
- D. 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.
- E. A corrupt block on a standby database with Real-Time Query enabled, can be automatically recovered, using a block from the primary database.
Answer: A,B
Explanation:
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
NEW QUESTION # 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. Renaming a data file in the primary database
- B. Performing transportable tablespaces
- C. Adding a data file or creating a tablespace
- D. Creating a PDB from the existing PDB within the same CDB
- E. Adding or dropping a redo file group
Answer: C,D
Explanation:
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
NEW QUESTION # 40
Which THREE statements are true about Far Sync instances?
- A. They enable standby databases to be configured at remote distances from the primary without impacting performance on the primary.
- B. The Data Guard Broker must be used to deploy and manage Far Sync instances.
- C. They work with any protection level.
- D. They use an spfMe, a standby controlfile, and standby redo logs.
- E. A primary database can ship redo directly to multiple Far Sync instances.
Answer: A,B,E
Explanation:
Far Sync instances are a feature of Oracle Data Guard designed to support zero data loss protection over long distances:
The Data Guard Broker must be used to deploy and manage Far Sync instances (A): Data Guard Broker simplifies the deployment and management of Far Sync instances, which are an integral part of zero data loss protection configurations.
They enable standby databases to be configured at remote distances from the primary without impacting performance on the primary (C): Far Sync instances are designed to receive redo from the primary database and then forward it to a remote standby database, thereby avoiding any performance impact on the primary database itself.
A primary database can ship redo directly to multiple Far Sync instances (E): A primary database can be configured to send redo logs to more than one Far Sync instance, which can then forward the redo to their respective remote standby databases.
Reference:
Oracle Data Guard Concepts and Administration Guide
Oracle Database High Availability Overview
NEW QUESTION # 41
Which three statements are true about redo transport?
- A. With asynchronous redo transport, TTnn processes may read redo from the log buffer or from standby redo logs on the primary database.
- B. An RFS process on a standby database instance may receive redo from an archiver process on the primary database instance to perform archive gap resolution.
- C. Multiple RFS processes may receive redo on one far sync instance.
- D. Multiple RFS processes may receive redo on one standby database instance.
- E. With synchronous redo transport, LGWR ships redo directly to RFS processes on the standby database instances and waits for an acknowledgment.
Answer: B,D,E
NEW QUESTION # 42
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