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NEW QUESTION # 33
Which THREE are true about using flashback database in a Data Guard environment?
- A. It may be used to flash back a physical standby that receives redo from a far sync instance.
- B. When a flashback database operation is performed on a primary database, a logical standby database is also flashed back automatically.
- 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. You can use it when real-time apply is enabled in case the physical standby suffers from logical corruption.
- F. It may not be used to flash back a primary database after a failover to a physical standby.
Answer: A,E,F
NEW QUESTION # 34
Examine this list of possible steps:
1. Raise the compatibility level on both databases.
2. Restart SQL Apply on the upgraded logical standby database.
3. Start SQL Apply on the old primary database.
4. Perform a Switchover to the logical standby database.
5. Upgrade the logical standby database.
6. Upgrade the old primary database.
Which is the minimum number of steps in the correct order, to perform a rolling release upgrade of a data guard environment using an existing logical standby database and to enable the new functionality?
- A. 4,6,5,2,3,1
- B. 1,5,2,4,6,3
- C. 5,2,4,1
- D. 5,2,4,6,3,1
- E. 5,2,4,3,6,1
Answer: B
Explanation:
The process of performing a rolling release upgrade in a Data Guard environment using a logical standby database generally involves these steps:
Raise the compatibility level on both databases (1): Ensuring both the primary and logical standby databases are operating with the same and correct compatibility level is essential before starting the upgrade process.
Upgrade the logical standby database (5): Apply the database upgrade to the logical standby first, which allows the primary database to continue serving the workload without interruption.
Restart SQL Apply on the upgraded logical standby database (2): Once the logical standby has been upgraded, SQL Apply must be restarted to apply the redo data from the primary database, which is still running the earlier version.
Perform a switchover to the logical standby database (4): After confirming that the logical standby database is successfully applying redo data, perform a switchover to make it the new primary database.
Upgrade the old primary database (6): With the new primary database now in place, upgrade the old primary database (which is now the new standby) to the new Oracle Database release.
Start SQL Apply on the old primary database (3): Finally, start SQL Apply on what is now the standby database to synchronize it with the new primary database.
Reference:
Oracle Data Guard Concepts and Administration Guide
Oracle Database Upgrade Guide
NEW QUESTION # 35
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. The redo transport mode is set to async for the standby database Sheep.
- B. The redo transport mode is set to asyn: for the standby database Cats.
- C. Cats is a snapshot standby database.
- D. The redo transport mode is set to async for both standby databases.
Answer: C
Explanation:
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.
Reference:
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.
Explanation:
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:
NEW QUESTION # 36
Which TWO observations are true about the Far Sync instance?
- A. Includes a standby control file, password file, data files, standby redo logs, and archive logs
- B. Can be created using the RMAN DUPLICATE command
- C. Receives redo synchronously from the primary database
- D. Applies redo received
- E. Can only be created using a series of SQL commands
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 # 37
A Data Guard environment has this configuration and these attributes:
The primary database prima is in the local region.
A physical standby database physt1 is in the local region.
A physical standby database physt2 is in a remote region.
The primary ships redo to physt1.
physt1 ships redo to physt2.
physt1 and physt2 have Real-Time Query enabled.
A sequence has been created with this SQL statement in the primary database:
CREATE SEQUENCE a NOCACHE SESSION;
Which TWO statements are TRUE?
- A. physt2 will no longer receive redo if physt1 becomes unavailable, unless LOG_ARCHIVE_DEST_n has the ALTERNATE attribute specified on the primary database.
- B. physt2 will no longer receive redo if physt1 becomes unavailable, unless LOG_ARCHIVE_DEST_n has the ALTERNATE attribute specified on physt1.
- C. The sequence is usable on physt1 but not usable on physt2.
- D. The sequence is usable on physt2 if physt1 becomes unavailable, but only if an alternate redo destination has been configured on the primary database.
- E. The sequence is usable on physt1 and physt2.
Answer: A,E
NEW QUESTION # 38
Which TWO observations are true about the Far Sync instance?
- A. Includes a standby control file, password file, data files, standby redo logs, and archive logs
- B. Can be created using the RMAN DUPLICATE command
- C. Receives redo synchronously from the primary database
- D. Applies redo received
- E. Can only be created using a series of SQL commands
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.
References: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 # 39
Which THREE statements are TRUE about Global Sequences when connected to a physical standby database with Real-Time Query enabled?
- A. Their usage may have a performance impact on the physical standby database if the CACHE size is too small.
- B. If the CACHE option is set then the size of the cache must be at least 100.
- C. Their creation requires that a LOG archive_dest_n parameter be defined in the standby that points back to the primary.
- D. Their usage will always have a performance impact on the primary database.
- E. They must have the NOORDEK and CACHE options set.
Answer: A,D,E
Explanation:
Global Sequences are Oracle sequences that generate unique values across multiple instances in an Oracle RAC or a Data Guard configuration. Regarding their behavior and performance when connected to a physical standby database with Real-Time Query enabled:
A: The usage of Global Sequences can indeed have a performance impact on the primary database due to the need to generate unique values that are consistent across both primary and standby databases.
D: The performance impact on the physical standby database may occur if the CACHE size is too small. This is because the standby database will frequently have to access the primary database to replenish the cache, which can increase the load and potentially lead to performance degradation.
E: Global Sequences should have the NOORDER and CACHE options set. The NOORDER option ensures that sequence numbers are provided without guaranteeing sequence order, thus improving scalability and performance. The CACHE option is used to specify how many sequence values will be held in memory for faster access.
Option B is incorrect as the LOG_ARCHIVE_DEST_n parameter's definition for standbys pointing back to the primary does not directly pertain to the creation of sequences.
Option C is incorrect because there is no requirement that the size of the cache for a sequence must be at least 100. The CACHE size can be set to a different number based on specific use cases or performance considerations.
NEW QUESTION # 40
Which THREE statements are true about snapshot standby databases?
- A. FLASHBACK DATABASE is enabled automatically on a physical standby database as part of the conversion into a snapshot standby database, if not already enabled.
- B. A snapshot standby database can have Real-Time apply enabled.
- C. FLASHBACK DATABASE must be manually enabled on a physical standby database before converting it into a snapshot standby database.
- D. A snapshot standby database may be opened read-write.
- E. FLASHBACK DATABASE is enabled automatically on a snapshot standby database after converting it from a physical standby database if not already enabled.
- F. A snapshot standby database may be opened read-only.
Answer: A,D,E
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 # 41
Which four factors can influence the rate of SQL apply on a logical standby database?
- A. the number of full table scans performed by SQL apply
- B. the size of the undo tablespace on the logical standby database
- C. the number of PREPAER processes
- D. the number of coordinator processes on the standby database instance
- E. the number of applier processes
- F. the size of the shared pool
Answer: A,C,D,E
Explanation:
The rate of SQL apply on a logical standby database can be influenced by:
A: The number of PREPARER processes (which seems to be a typographical error and should read as PREPARER or similar) which prepare the redo data for the applier processes.
B: The number of coordinator processes on the standby database instance which coordinate the SQL apply activities.
C: The number of full table scans performed by SQL apply since full table scans can be resource-intensive and slow down the apply rate.
E: The number of applier processes which apply the redo data to the logical standby database.
Option D is incorrect as the size of the undo tablespace on the logical standby database is more likely to affect the SQL apply lag rather than the rate of SQL apply.
Option F is incorrect because the size of the shared pool would typically not influence the rate of SQL apply. The shared pool is more related to the caching of shared SQL and PL/SQL code and control structures.
NEW QUESTION # 42
Examine the Data Guard configuration after an accidental switchover to Sheep:
DGMGRL> show configuration;
Configuration - Animals
Protection Mode: MaxAvailability
Databases:
sheep - Primary database
dogs - Logical standby database
cats - Physical standby database (disabled)
ORA-16795: the standby database needs to be re-created
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS
Which three statements will be true after a switchover to Dogs?
- A. Cats will be an enabled physical standby database.
- B. Dogs will be the primary database.
- C. Cats will be a disabled physical standby database that can be manually enabled.
- D. Sheep will be a disabled logical standby database.
- E. Sheep will be an enabled logical standby database.
Answer: B,C,E
NEW QUESTION # 43
Which two are true about managing and monitoring Oracle container databases in a Data Guard environment using the broker?
- A. After a role change, the broker opens all Pluggable databases (pdbb) on the new primary.
- B. If the primary database is a container database, then a logical standby may be a non-container database.
- C. If the primary database is a container database, then a physical standby may be a non-container database.
- D. All broker actions execute at the root container for container databases.
- E. If the primary database is not a container database, then a standby may be a container database.
Answer: A,D
Explanation:
In the context of Oracle Data Guard and container databases (CDBs) managed by Data Guard Broker:
All broker actions execute at the root container for container databases (D): When using Data Guard Broker to manage a CDB, the actions performed by the broker are executed at the level of the root container. This is because the root container maintains the control and configuration information that applies to the entire CDB, including all of its pluggable databases (PDBs).
After a role change, the broker opens all Pluggable databases (PDBs) on the new primary (E): Following a role transition such as a switchover or a failover, Data Guard Broker ensures that all PDBs within the CDB of the new primary database are opened, which is essential to resume operations of the PDBs without manual intervention.
Reference:
Oracle Data Guard Broker documentation
Oracle Multitenant Administrator's Guide
NEW QUESTION # 44
Which feature is available when monitoring a Data Guard configuration using Enterprise Manager Cloud Control, but is not available using DGMGRL or by using SQL?
- A. Automatic creation of standby redo logs
- B. Performing a verify operation
- C. Viewing a logical standby database apply lag
- D. Creating a broker configuration before creating the databases
- E. Analyzing the dmon process trace file
Answer: C
NEW QUESTION # 45
Examine the Data Guard configuration:
DGMGRL> show configuration;
Configuration - Animals
Protection Mode: MaxAvailability
Databases:
dogs - Primary database
sheep - Snapshot standby database
cats - Physical 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.
Which is the minimum statement, or sequence of statements you must execute to enable successful raising of the protection mode to Maximum Protection?
- A. DGMGRL> edit database dogs set property LogxptMode=sync;
DGMGRL> edit database sheep set property LogxptMode=sync; - B. DGMGRL> edit database dogs set property LogXptMode=sync;
DGMGRL> edit database sheep set property LogxptMode=sync;
DGMGRL> edit database cats set property LogXptMode=sync; - C. DGMGRL> edit database dogs set property LogxptMode=sync;
- D. DGMGRL> edit database sheep set property LogXptMode=sync;
- E. DGMGRL> edit database cats set property LogXptMode=sync;
- F. DGMGRL> edit database dogs set property LogXptMode=sync;
DGMGRL> edit database cats set property LogXptMode=sync;
Answer: F
NEW QUESTION # 46
Which THREE are among the various tasks performed by the Data Guard Monitor (DMON) process?
- A. activating role-based services appropriately in the various database instances of the configuration, based on the database role
- B. performing role transitions when switchover requests are made
- C. maintaining information about all members of the broker configuration in binary configuration files.
- D. communicating with dkon processes in other database instances that are part of the broker configuration
- E. communicating with the DMON process of the observer to monitor a primary database in case a fast start failover is required
Answer: A,B,C
Explanation:
The Data Guard Monitor (DMON) process is a key component of Oracle Data Guard. It plays a crucial role in managing and monitoring the state of both the primary and standby databases in a Data Guard configuration.
Performing role transitions when switchover requests are made (A): DMON is responsible for coordinating the switchover process between the primary and standby databases. This involves safely transitioning the roles of the databases to ensure data protection and availability.
Maintaining information about all members of the broker configuration in binary configuration files (B): DMON maintains detailed information about the databases in the Data Guard configuration, including their roles, states, and network addresses. This information is stored in binary configuration files, which are used by the Data Guard Broker to manage the Data Guard environment.
Activating role-based services appropriately in the various database instances of the configuration, based on the database role (C): DMON activates services that are appropriate for the role of each database in the Data Guard configuration. For example, it may activate different services on a primary database than on a standby database, based on the specific requirements of each role.
Reference:
Oracle Data Guard Concepts and Administration
Oracle Data Guard Broker documentation
NEW QUESTION # 47
There are currently 6 applief. and 6 pfepafef processes running and no idle applier processes on y logical standby database.
The max_SERVERS SQL apply parameter and number of archiver processes are both set to 12.
Identify two changes, each of which would allow you to increase the number of applier processes.
- A. Increase the processes initialization parameter. D Decrease the number of FREPARER processes.
- B. Decrease the number of archiver processes on the standby database.
- C. Increase the RECOVERY_PARALLEL initialization parameter.
- D. Increase the parallel_max_server initialization parameter.
- E. Increase the value for the MAX_SERVERS SQL apply parameter.
Answer: D,E
Explanation:
To increase the number of applier processes on a logical standby database, the following changes can be made:
C: Increasing the value for the MAX_SERVERS SQL apply parameter would allow for more applier processes to be initiated, assuming that system resources permit.
D: Increasing the PARALLEL_MAX_SERVERS initialization parameter would allow for more parallel execution processes, which can be used by SQL apply to increase the number of applier processes.
Option A is incorrect as decreasing the number of archiver processes will not necessarily increase the number of applier processes; these are unrelated components.
Option B is incorrect because the 'FREPARER' processes do not exist, it seems to be a typographical error, and the 'REPARER' is not a valid Oracle process or parameter.
Option E is incorrect because the RECOVERY_PARALLELISM parameter controls the number of processes used for instance recovery and media recovery, not for SQL apply.
NEW QUESTION # 48
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. Lower DB_BLOCK_CHECKING to MEDIUM or low on the standby databases.
- C. Decrease the redo log file size on the primary database.
- D. Increase the size of the buffer cache on the physical standby database instances.
- E. Increase the number of standby redo log files on the standby databases.
Answer: A,B
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 # 49
Which two statements are true regarding asynchronous redo transport in a Data Guard
- A. The performance of SQL apply on a logical standby database always improves when using this transport mode.
- B. This transport mode satisfies the minimum requirements for Maximum Performance data protection mode.
- C. Real-time query performance on a physical standby database improves for current read requests when using this transport mode.
- D. A transaction can commit without waiting for redo to be sent to any standby database in the data guard configuration.
- E. This transport mode satisfies the minimum requirements for Maximum Availability data protection mode.
Answer: B,D
Explanation:
Asynchronous redo transport is a method where the primary database does not wait for an acknowledgment from the standby database before committing transactions, which helps in minimizing the impact on the primary database's performance (B). This transport mode is associated with the Maximum Performance data protection mode, which prioritizes performance over synchronicity of data between the primary and standby databases (C). While it provides a level of data protection, there could be some data loss in the event of a primary database failure because redo data may not have been transmitted to the standby database at the time of the failure.
References:Oracle Data Guard Concepts and Administration documentation provides detailed explanations of different redo transport modes and their implications on data protection and performance. Asynchronous transport mode's behavior and association with Maximum Performance mode are outlined explicitly.
NEW QUESTION # 50
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