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NEW QUESTION # 34
Which three statements are true about snapshot standby databases?
- A. The FATLOVER TO command results in a transition of a snapshot standby database to the primary role.
- B. The switchover TO command allows a switchover operation to a snapshot standby database.
- C. Tables can be dropped.
- D. A logical standby database can be converted into a snapshot standby database.
- E. Tablespaces can be created.
- F. Tablespaces can be dropped.
Answer: C,E,F
Explanation:
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.
References: Oracle Data Guard Concepts and Administration guide details the operations allowed on snapshot standby databases and the processes for transitioning between physical, snapshot, and logical standby databases.
NEW QUESTION # 35
Examine the Data Guard configuration:
What happens if you issue "switchover to sheep;" at the DGMGRL prompt?
- A. The switchover succeeds and Dogs 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 Fast-Start Failover is suspended.
- E. The switchover succeeds and Cats becomes the new failover target.
Answer: A
Explanation:
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.
NEW QUESTION # 36
A customer asks for your recommendation regarding this requirement:
1. We plan to have a Data Guard Configuration with one primary database and one physical standby database.
2. We want zero data loss in case of a disaster involving the loss of one component.
3. We want to do Real Application Testing occasionally on the Standby Database.
Which solution, if any, satisfies these requirements?
- A. These requirements cannot be met.
- B. A physical standby database with synchronous redo transport that can be converted regularly into a snapshot standby to do real application testing
- C. A far sync instance plus a snapshot standby database and real time apply that can be converted regularly into logical standby database to do real application testing
- D. A snapshot standby database with real time query that can be converted regularly into a physical standby database open read write, to do real application testing
Answer: B
Explanation:
Synchronous redo transport for zero data loss (B): To guarantee zero data loss in the case of a disaster, synchronous redo transport must be configured between the primary and standby databases.
Conversion to snapshot standby for testing (B): A physical standby database can be temporarily converted into a snapshot standby database to perform real application testing. After testing is completed, the snapshot standby can be converted back to a physical standby to resume its disaster recovery role.
Reference:
Oracle Data Guard Concepts and Administration Guide
Oracle Database Testing Guide
NEW QUESTION # 37
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. A snapshot standby database may be opened read-only.
- D. FLASHBACK DATABASE is enabled automatically on a snapshot standby database after converting it from a physical standby database if not already enabled.
- E. A snapshot standby database may be opened read-write.
- F. FLASHBACK DATABASE is enabled automatically on a physical standby database as part of the conversion into a snapshot standby database, if not already enabled.
Answer: D,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 # 38
Which two steps must be performed before running DUPLICATE TARGET DATABASE FOR STANDBY using RMAN?
- A. Create an SPFILE for the standby database.
- B. Transfer a copy of the password file from the primary host to the standby host.
- C. Create a standby control file.
- D. Configure Oracle Net connectivity between the primary host and the standby host.
- E. Run the nid utility to modify the DBID of the primary database.
Answer: B,D
NEW QUESTION # 39
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 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.
- B. Create role based services with the si vet] utility when using clusterware for Oracle RAC databases or Oracle Restart for single instance Oracle databases.
- C. 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.
- D. Establish Oracle Net connectivity to the primary database instance from all the standby database instances.
- 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: C,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. 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.
NEW QUESTION # 40
You have a Data Guard Broker configuration called 'Somewhere' as shown:
DGMGRL> SHOW CONFIGURATION;
Configuration - Somewhere
Protection Mode: MaxPerformance
Databases:
Nearby - Primary database
FS - Far Sync
Farout - Physical standby database
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS
You then run this command:
DGMGRL> SHOW DATABASE 'Nearby' 'InconsistentProperties';
Which two are true about the output of this DGMGRL command?
- A. Any inconsistency reported is on an instance-specific basis.
- B. It shows all properties whose broker configuration values for database Nearby are inconsistent with the values in the corresponding server parameter file or the runtime values for database instance Nearby.
- C. It shows all properties whose broker configuration values for database Nearby are inconsistent with the broker configuration values for database Farout.
- D. A far sync instance cannot have inconsistent properties because it has no database.
Answer: B,D
NEW QUESTION # 41
Which FOUR database parameters might be affected by or influence the creation of standby databases?
- A. FALSERVER
- B. db_file_name_convert
- C. STANDBY_ARCHIVE_DEST
- D. COMPATIBLE
- E. DB_NAME
- F. ARCHIVE_LAG_TARGET
Answer: B,C,D,E
Explanation:
* DB_NAME (A): The name of the database, which should remain consistent across the primary and standby databases.
* db_file_name_convert (C): This parameter helps define the mapping of data file names from the primary to the standby database, which is crucial during the creation and operation of a standby database.
* COMPATIBLE (D): The compatibility level can influence the features that can be used on the standby database and must be consistent with or higher than that of the primary database, especially after upgrades.
* STANDBY_ARCHIVE_DEST (F): This parameter specifies the destination of archived redo log files on the standby database, which is important for log transport and apply services.
References:
* Oracle Data Guard Concepts and Administration Guide
* Oracle Database Reference
NEW QUESTION # 42
Your Data Guard environment consists of these components and settings:
1. A primary database
2. Two remote physical standby databases
3. The redo transport mode is set to sync
4. Real-time query is enabled for both standby databases
5. The DB_BLOCK_CHECKING parameter is set to TRUE on both standby databases You notice an increase in redo apply lag time on both standby databases.
Which two would you recommend to reduce the redo apply lag on the standby databases?
- A. Increase the size of standby redo log files on the standby databases.
- B. Increase the size of the buffer cache on the physical standby database instances.
- C. Decrease the redo log file size on the primary database.
- D. Lower DB_BLOCK_CHECKING to MEDIUM or low on the standby databases.
- E. Increase the number of standby redo log files on the standby databases.
Answer: A,D
Explanation:
To reduce the redo apply lag on standby databases, one could increase the size of the standby redo log files.
Larger redo log files can accommodate more redo data, which may reduce the frequency of log switches and allow for more continuous application of redo data. Additionally, lowering the DB_BLOCK_CHECKING parameter to MEDIUM or LOW on the standby databases can help improve redo apply performance. High block checking can impose additional CPU overhead during the application of redo data, potentially increasing apply lag times. By reducing the level of block checking, you can lessen this overhead and help reduce the apply lag .
NEW QUESTION # 43
Which THREE are true about using flashback database in a Data Guard environment?
- A. When a flashback database operation is performed on a primary database, a physical standby database is also flashed back automatically.
- B. 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.
- C. It may not be used to flash back a primary database after a failover to a physical standby.
- D. You can use it when real-time apply is enabled in case the physical standby suffers from logical corruption.
- E. When a flashback database operation is performed on a primary database, a logical standby database is also flashed back automatically.
- F. It may be used to flash back a physical standby that receives redo from a far sync instance.
Answer: C,D,F
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 # 44
Examine this validate command:
DGMGRL> VALIDATE DATABASE VERBOSE "<database name>";
Which THREE statements are TRUE?
- A. The command performs network connectivity checks between members of a broker configuration.
- B. The command performs a comprehensive set of database checks prior to a role change.
- C. The command uses information available in various Oracle Data Guard views as well as the Automatic Diagnostic Repository.
- D. The command performs a comparison of SPFILE entries between the primary database and a specified standby database.
- E. The command can be used for a logical standby database.
Answer: A,B,E
Explanation:
* The command performs a comprehensive set of database checks prior to a role change (A): The VALIDATE DATABASE command in Data Guard Manager (DGMGRL) is designed to perform an exhaustive check of a specified database's readiness for a role change, such as a switchover or failover.
* The command performs network connectivity checks between members of a broker configuration (C): One of the checks includes verifying that the necessary network connectivity exists between the databases in a Data Guard Broker configuration.
* The command can be used for a logical standby database (D): The VALIDATE DATABASE command is versatile and can be used for both physical and logical standby databases to ensure their readiness for role changes.
References:
* Oracle Data Guard Broker documentation
* Oracle Data Guard Concepts and Administration Guide
NEW QUESTION # 45
You have a Data Guard broker configuration consisting of:
A primary database
One local physical standby database
One far sync instance
A remote physical standby database
The broker configuration was created with the DGMGRL utility after creating all the databases and the far sync instance with command-line tools.
What is the correct way to add this configuration to Enterprise Manager Cloud Control assuming all the nodes have been discovered already as Enterprise Manager targets?
- A. Discover the primary database as a target in Enterprise Manager Cloud Control. Then discover the existing Data Guard Broker configuration for the primary and all the other databases in the configuration will be discovered as targets and be ready to be monitored.
- B. Discover the primary as a target by refreshing the node on which it runs, and the other databases and instances in the Data Guard broker configuration will be discovered as targets automatically and be ready to be monitored.
- C. Delete the Data Guard Broker configuration using DGMGRL and then re-create it using Enterprise Manager Cloud Control to enable all the databases in the configuration to be discovered as targets and to be ready to be monitored.
- D. Use the DGMGRL utility to register the configuration with the Enterprise Manager Cloud Control agent on the primary database node. This will enable the discovery of all the other databases in the configuration as targets which will be ready to be monitored.
- E. Discover either of the physical standby databases as a target by refreshing the node on which they run, and the other databases and instances in the Data Guard Broker configuration will be discovered as targets automatically and be ready to be monitored.
Answer: A
NEW QUESTION # 46
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, 2, 3, 6, and 7
- B. 1, 6, and 7
- C. 1, 2, and 5
- D. 1, 2, 6, and 7
- E. 1, 2, 3, 4, 5, 6, and 7
Answer: E
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.
Reference
Oracle 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 # 47
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. It will execute successfully on an Oracle 19c logical standby database while SQL apply is active.
- B. 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.
- C. It will execute successfully while an Oracle 19c primary database is open.
- D. It will execute successfully on an Oracle 19c physical standby database while Real Time Query 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 physical standby databases that are part of the configuration.
Answer: A,C,E
Explanation:
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.
NEW QUESTION # 48
Which TWO are benefits of using Transaction Guard in a Data Guard environment?
- A. It provides application continuity by replaying transactions interrupted by a failover or a switchover
- B. It protects against logical corruptions being replicated to standby databases.
- C. It provides application continuity by rolling back uncommitted transactions interrupted by a failover or switchover.
- D. It protects against recoverable errors during a planned or an unplanned outage of a primary database.
- E. It protects against user errors being replicated to standby databases.
Answer: C,D
Explanation:
Transaction Guard provides benefits in terms of transaction consistency and recovery in a Data Guard environment:
* It provides application continuity by rolling back uncommitted transactions interrupted by a failover or switchover (B): Transaction Guard ensures that any uncommitted transactions at the time of an outage are rolled back consistently, thus preserving the integrity of the application's data and state.
* It protects against recoverable errors during a planned or an unplanned outage of a primary database (D): Transaction Guard offers protection against errors that can occur during outages, allowing applications to resume operations more quickly and reliably after recovery.References:
* Oracle Database High Availability Overview
* Oracle Real Application Clusters Administration and Deployment Guide
NEW QUESTION # 49
Which three Data Guard monitoring activities may be performed using Enterprise Manager Cloud Control?
- A. You can check the potential data loss in the event of a disaster.
- B. You can set a warning threshold on the redo generation rate metric for a physical standby database.
- C. You can monitor the redo apply rate on a logical standby database.
- D. You can set a critical threshold on the redo generation rate metric for a primary database.
- E. You can monitor the redo apply rate on a snapshot standby database.
- F. You can check if redo apply needs to be tuned.
Answer: A,C,D
Explanation:
Enterprise Manager Cloud Control offers comprehensive monitoring capabilities for Oracle Data Guard environments. It enables monitoring the rate at which redo is being applied on a logical standby database (A), which is crucial for ensuring that the standby database is keeping up with the changes from the primary. It also allows setting thresholds on performance metrics, such as the redo generation rate on the primary database (B), to alert administrators when values exceed critical or warning thresholds. Additionally, it provides the capability to estimate the potential data loss in the event of a disaster (E), helping in disaster recovery planning and ensuring business continuity.
Reference:
Oracle Enterprise Manager Cloud Control documentation provides extensive information on its monitoring features for Oracle Data Guard, including setting thresholds, estimating potential data loss, and tracking redo apply rates.
NEW QUESTION # 50
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