Oracle 1z0-076 Certification Exam Dumps with 111 Practice Test Questions
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NEW QUESTION # 48
Which statement is true regarding Oracle Net connectivity for a Data Guard Broker configuration?
- A. 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.
- B. The LOCAL_LISTENER initialization parameter must be set to the listener used to register the primary database instance.
- C. A TNS entry enabling connectivity to the primary database instance must be defined on each of the standby database hosts.
- D. 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.
- E. A TNS entry or entries enabling connectivity to standby database instance(s) must be defined on the primary database host.
Answer: E
NEW QUESTION # 49
Examine this validate command:
DGMGRL> VALIDATE DATABASE VERBOSE "<database name>";
Which THREE statements are TRUE?
- A. The command uses information available in various Oracle Data Guard views as well as the Automatic Diagnostic Repository.
- B. The command performs a comprehensive set of database checks prior to a role change.
- C. The command can be used for a logical standby database.
- D. The command performs a comparison of SPFILE entries between the primary database and a specified standby database.
- E. The command performs network connectivity checks between members of a broker configuration.
Answer: B,C,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.
Reference:
Oracle Data Guard Broker documentation
Oracle Data Guard Concepts and Administration Guide
NEW QUESTION # 50
Which two are true about managing and monitoring Oracle container databases in a Data Guard environment using the broker?
- A. All broker actions execute at the root container for container databases.
- B. If the primary database is not a container database, then a standby may be a container database.
- C. If the primary database is a container database, then a physical standby may be a non-container database.
- D. If the primary database is a container database, then a logical standby may be a non-container database.
- E. After a role change, the broker opens all Pluggable databases (pdbb) on the new primary.
Answer: A,E
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 # 51
Which THREE steps are prerequisites for the creation of a physical standby database on a separate server using the RMAN active database duplication method?
- A. Set the DB_UNIQUE_NAME parameter on the primary database to a different value than that of the DB_NAME name parameter.
- B. Establish user equivalence for the database software owner between the primary host and standby host.
- C. Put the primary database into archivelog mode.
- D. Configure Oracle Net connectivity on the primary host to the standby database instance.
- E. startup nomount the standby database instance.
Answer: B,D,E
Explanation:
Creating a physical standby database using RMAN active database duplication requires certain prerequisites to ensure a successful and seamless operation:
Configure Oracle Net connectivity on the primary host to the standby database instance (A): Proper Oracle Net connectivity between the primary and standby servers is essential for communication and data transfer during the duplication process. Oracle Net services provide the network foundation for Oracle Database, Oracle Net Listener, and Oracle applications.
Establish user equivalence for the database software owner between the primary host and standby host (B): User equivalence ensures that the user who owns the Oracle Database software on the primary server has the same privileges on the standby server. This is crucial for RMAN to perform operations on both servers without encountering permission issues.
Startup nomount the standby database instance (C): The standby database instance needs to be started in the NOMOUNT stage before the duplication can begin. This prepares the environment for creating the control file and restoring the database without mounting it, which is a necessary step in the RMAN duplication process.
Reference:
Oracle Database Backup and Recovery User's Guide
Oracle Data Guard Concepts and Administration
NEW QUESTION # 52
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. You can use it when real-time apply is enabled in case the physical standby suffers from logical corruption.
- C. When a flashback database operation is performed on a primary database, a physical standby database is also flashed back automatically.
- D. It may not be used to flash back a primary database after a failover to a physical standby.
- E. 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.
- F. When a flashback database operation is performed on a primary database, a logical standby database is also flashed back automatically.
Answer: A,B,D
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 # 53
Your Data Guard environment consists of these components and settings:
1. A primary database
2. A remote physical standby database
3. Real-time query is enabled.
4. The redo transport mode is set to SYNC.
5. The protection mode is set to Maximum Availability.
You notice that queries executed on the physical standby database receive errors: ORA-03172: STANDBY_MAX_DATA_DELAY of 15 seconds exceeded. Which two would you recommend to avoid this error?
- A. Increase the number of standby redo log files on the primary database.
- B. Change the protection mode to Maximum Protection.
- C. Change the protection mode to Maximum Performance.
- D. Reduce I/O latency for the storage used by the primary database.
- E. Increase the network bandwidth between the primary and standby databases.
- F. Increase the size of the buffer cache on the standby database instance.
Answer: D,E
Explanation:
The ORA-03172: STANDBY_MAX_DATA_DELAY error indicates that the real-time query on the physical standby database is experiencing delays beyond the specified maximum data delay threshold. Increasing the network bandwidth (Option E) can enhance the speed at which redo data is transferred from the primary to the standby database, thereby reducing the likelihood of exceeding the STANDBY_MAX_DATA_DELAY threshold. Reducing I/O latency on the primary database's storage (Option B) ensures that redo data is generated and shipped more efficiently, further mitigating the risk of delay. These actions, focused on optimizing data transfer and processing speed, address the root causes of the ORA-03172 error in a synchronous Data Guard configuration operating in Maximum Availability mode.
NEW QUESTION # 54
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. PL/SQL blocks that you run on Active Data Guard standby databases can be always redirected to and run on the primary database.
- C. The DML operations on a standby can be transparently redirected to and run on the primary database
- D. Read-mostly reporting applications that use global temporary tables for storing temporary data can be offloaded.
- E. The DDL operations on private temporary tables are transparently redirected to the primary database.
Answer: A,C,D
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.
References: The behavior and capabilities of Active Data Guard standby databases are documented in the Oracle Data Guard Concepts and Administration guide and the Active Data Guard documentation.
NEW QUESTION # 55
Which four statements are true regarding SQL Apply filters for a logical standby database?
- A. They can only be used to skip DML statements on a table.
- B. They can be used to skip ALTE1 STEM and ALTER DATABASE commands.
- C. They can be used to skip execution of DML triggers on a table while allowing the DML to execute.
- D. They can be used to skip ALTER TABLE commands on specific tables.
- E. They can be used to skip all SQL statements executed on a specific pluggable database (PDB) within a standby multitenant container database (CDB).
- F. They can be used to skip CREATE TABLE commands.
- G. They can be used to stop SQL apply if it encounters an error.
Answer: B,C,D,F
Explanation:
Based on the Oracle Database 19c documentation, the correct answers about SQL Apply filters for a logical standby database are:A. They can be used to skip execution of DML triggers on a table while allowing the DML to execute.B. They can be used to skip CREATE TABLE commands.C. They can be used to skip ALTER SYSTEM and ALTER DATABASE commands.G. They can be used to skip ALTER TABLE commands on specific tables.
Comprehensive Detailed Explanation:SQL Apply filters in a logical standby database can be set to control which SQL operations are applied to the standby. These filters allow for certain commands to be skipped, ensuring that they do not impact the standby database. For example, filters can be used to skip the execution of DML triggers to prevent them from firing during SQL Apply, while still allowing the underlying DML to be executed on the logical standby database. This is particularly useful when certain triggers are not desired to run in a standby environment. CREATE TABLE, ALTER SYSTEM, ALTER DATABASE, and specific ALTER TABLE commands can also be skipped using SQL Apply filters to prevent unwanted structural changes or administrative operations from affecting the logical standby database. These capabilities provide a level of control to ensure that the logical standby database reflects only the desired state of the primary database.
References:Oracle Database SQL Language Reference and Oracle Data Guard Concepts and Administration guide offer comprehensive details on the use of SQL Apply filters, including the range of SQL statements that can be influenced by these filters in a logical standby database environment.
NEW QUESTION # 56
A customer has these requirements for their proposed Data Guard implementation:
1. Zero data loss must still be guaranteed through the loss of any one configuration component.
2. The primary database must be protected against a regional disaster.
3. Performance overheads on the primary should be minimized as much as possible given these requirements.
4. Downtime on the primary database for any reason must be kept to a minimum.
Components referred to in the broker commands are:
- A.
- B.
- C.
- D.
Answer: C
Explanation:
According to the requirements stated:
Zero data loss must be guaranteed despite the loss of any one component: This necessitates synchronous redo transport to at least one standby database (for no data loss).
The primary database must be protected against a regional disaster: This implies that there must be a standby database in a different region.
Performance overhead on the primary should be minimized: This suggests that asynchronous transport should be used where possible to reduce the performance impact on the primary.
Downtime on the primary for any reason must be kept to a minimum: This is indicative of a requirement for a fast failover mechanism, possibly with a fast-start failover (FSFO) and high availability.
Given these requirements, the appropriate option that fulfills all these is:
Option C, where 'prima' is the primary database, 'fs1' is the Far Sync instance in the primary region, and 'physt' and 'physt2' are physical standby databases in the primary and remote regions, respectively. In this configuration:
'prima' is set to send redo to 'fs1' using SYNC to guarantee zero data loss.
'fs1' is set to send redo to 'physt' (local standby) using FASTSYNC, which is a low-latency synchronous transport that is optimized for performance.
The Data Guard configuration's protection mode is set to MAXAVAILABILITY to provide the highest level of data protection that is possible without compromising the availability of the primary database.
This configuration ensures that there is zero data loss even if the primary region is completely lost, maintains performance by limiting the synchronous transport to the local region with a Far Sync instance, and has a remote standby database in a separate region for disaster recovery purposes.
Reference:
Oracle Data Guard Concepts and Administration
Oracle Data Guard Broker documentation
NEW QUESTION # 57
Which THREE statements are true about snapshot standby databases?
- A. A snapshot standby database can have Real-Time apply enabled.
- B. FLASHBACK DATABASE must be manually enabled on a physical standby database before converting it into a snapshot standby database.
- 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-write.
- E. A snapshot standby database may be opened read-only.
- 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,D,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 # 58
A customer has these requirements for their proposed Data Guard implementation:
1. Zero data loss must still be guaranteed through the loss of any one configuration component.
2. The primary database must be protected against a regional disaster.
3. Performance overheads on the primary should be minimized as much as possible given these requirements.
4. Downtime on the primary database for any reason must be kept to a minimum.
Components referred to in the broker commands are:
- A.
- B.
- C.
- D.
Answer: C
Explanation:
According to the requirements stated:
* Zero data loss must be guaranteed despite the loss of any one component: This necessitates synchronous redo transport to at least one standby database (for no data loss).
* The primary database must be protected against a regional disaster: This implies that there must be a standby database in a different region.
* Performance overhead on the primary should be minimized: This suggests that asynchronous transport should be used where possible to reduce the performance impact on the primary.
* Downtime on the primary for any reason must be kept to a minimum: This is indicative of a requirement for a fast failover mechanism, possibly with a fast-start failover (FSFO) and high availability.
Given these requirements, the appropriate option that fulfills all these is:
* Option C, where 'prima' is the primary database, 'fs1' is the Far Sync instance in the primary region, and
'physt' and 'physt2' are physical standby databases in the primary and remote regions, respectively. In this configuration:
* 'prima' is set to send redo to 'fs1' using SYNC to guarantee zero data loss.
* 'fs1' is set to send redo to 'physt' (local standby) using FASTSYNC, which is a low-latency synchronous transport that is optimized for performance.
* The Data Guard configuration's protection mode is set to MAXAVAILABILITY to provide the highest level of data protection that is possible without compromising the availability of the primary database.
This configuration ensures that there is zero data loss even if the primary region is completely lost, maintains performance by limiting the synchronous transport to the local region with a Far Sync instance, and has a remote standby database in a separate region for disaster recovery purposes.
References:
* Oracle Data Guard Concepts and Administration
* Oracle Data Guard Broker documentation
NEW QUESTION # 59
Which THREE steps are prerequisites for the creation of a physical standby database on a separate server using the RMAN active database duplication method?
- A. Set the DB_UNIQUE_NAME parameter on the primary database to a different value than that of the DB_NAME name parameter.
- B. Establish user equivalence for the database software owner between the primary host and standby host.
- C. Put the primary database into archivelog mode.
- D. Configure Oracle Net connectivity on the primary host to the standby database instance.
- E. startup nomount the standby database instance.
Answer: B,D,E
Explanation:
Creating a physical standby database using RMAN active database duplication requires certain prerequisites to ensure a successful and seamless operation:
* Configure Oracle Net connectivity on the primary host to the standby database instance (A):
* Proper Oracle Net connectivity between the primary and standby servers is essential for communication and data transfer during the duplication process. Oracle Net services provide the network foundation for Oracle Database, Oracle Net Listener, and Oracle applications.
* Establish user equivalence for the database software owner between the primary host and standby host (B): User equivalence ensures that the user who owns the Oracle Database software on the primary server has the same privileges on the standby server. This is crucial for RMAN to perform operations on both servers without encountering permission issues.
* Startup nomount the standby database instance (C): The standby database instance needs to be started in the NOMOUNT stage before the duplication can begin. This prepares the environment for creating the control file and restoring the database without mounting it, which is a necessary step in the RMAN duplication process.References:
* Oracle Database Backup and Recovery User's Guide
* Oracle Data Guard Concepts and Administration
NEW QUESTION # 60
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. Cats is a snapshot standby database.
- 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.
Answer: B
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 # 61
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. A physical standby database with synchronous redo transport that can be converted regularly into a snapshot standby to do real application testing
- B. 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
- C. 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
- D. These requirements cannot be met.
Answer: A
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 # 62
Which two factors can cause an increase in redo transport lag?
- A. Increase in network latency between the primary database and a redo transport destination.
- B. The size of the standby redo log files on the primary database.
- C. The size of the online redo log files on the standby database.
- D. Increase in redo generation rate on the primary database.
- E. The size of the online redo log files on the primary database.
Answer: A,D
NEW QUESTION # 63
Which two are prerequisites for configuring flashback database for Oracle 19c databases, in a Data Guard environment?
- A. A far sync instance must be configured to flash back a standby when the primary has been flashed back.
- B. The database must be in ARCHTVELOG mode.
- C. The data guard broker must be used.
- D. The Data Guard real-time apply feature must be enabled.
- E. A fast recovery area must be configured.
Answer: B,E
Explanation:
* 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
NEW QUESTION # 64
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