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NEW QUESTION # 65
You notice that the SQL apply lag on your logical standby database has increased but the redo transport lag has not.
Which four could be reasons for the increase in SQL apply lag?
- A. An increased number of bulk updates on the primary
- B. The standby redo log files are undersized on the primary database
- C. An undersized undo tablespace on the logical standby
- D. Many SQL apply operations do full table scans
- E. An undersized shared pool
- F. An increased number of bulk inserts on the primary
Answer: A,C,D,E
Explanation:
The SQL apply lag on a logical standby database can be caused by several factors:
A: An undersized undo tablespace can lead to delays in SQL apply operations as it may not be able to handle the volume of undo records generated by the SQL apply process.
B: SQL apply operations that do full table scans can consume significant system resources, potentially leading to higher apply lag.
C: An increased number of bulk updates on the primary database may generate a large volume of redo data, which can cause apply lag if the logical standby cannot apply the changes quickly enough.
F: An undersized shared pool may affect the parsing and execution of SQL statements by SQL apply, which can contribute to the apply lag.
Option D is less likely to be a direct cause of SQL apply lag compared to bulk updates, as inserts generate new data rather than modifying existing data, which SQL apply can typically handle more efficiently.
Option E is incorrect because the size of the standby redo log files on the primary database impacts redo transport lag, not SQL apply lag.
NEW QUESTION # 66
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 both standby databases.
- B. The redo transport mode is set to asyn: for the standby database Cats.
- C. The redo transport mode is set to async for the standby database Sheep.
- D. Cats is a snapshot standby database.
Answer: D
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:
* D. Cats is a snapshot standby database.
Comprehensive Detailed Explanation:In an Oracle Data Guard environment, the Maximum Protection mode requires that all redo data be transmitted synchronously to at least one standby database, ensuring no data loss even in the event of a primary database failure. However, a snapshot standby database, by its nature, allows read-write access and is temporarily disconnected from the redo stream, which makes it unable to participate in the synchronous redo transport required by Maximum Protection mode. The presence of a snapshot standby database in the Data Guard configuration thus prevents the activation of Maximum Protection mode, as it cannot guarantee zero data loss without a standby database capable of receiving redo data synchronously.
References:Oracle Data Guard documentation clearly outlines the requirements and restrictions of different protection modes, including the necessity for standby databases to participate in synchronous redo transport to enable Maximum Protection mode. The inability of snapshot standby databases to fulfill this requirement is a key consideration when planning Data Guard configurations and protection levels.
NEW QUESTION # 67
Which two are true concerning the configuring of Flashback database in a Data Guard environment?
- A. It is a prerequisite for the use of Fast Start Failover.
- B. It enables the use of far sync instances.
- C. It is required in order for a snapshot standby database to be converted to a physical standby database.
- D. It permits a physical standby database to be converted to a snapshot standby database.
- E. It permits a primary database that was disabled after failover to be reinstated as a standby.
Answer: D,E
NEW QUESTION # 68
Which two factors can cause an increase in redo transport lag?
- A. The size of the standby redo log files on the primary database.
- B. The size of the online redo log files on the standby database.
- C. The size of the online redo log files on the primary database.
- D. Increase in network latency between the primary database and a redo transport destination.
- E. Increase in redo generation rate on the primary database.
Answer: D,E
NEW QUESTION # 69
Which three are prerequisites for enabling Fast-Start Failover?
- A. The Data Guard environment must be managed by the Data Guard Broker.
- B. Flashback Database must be enabled on both the primary database and the Fast-Start Failover target standby database.
- C. You can specify only one standby database as the fast-start failover target.
- D. The maximum protection mode can be used, but with two or more standby databases.
- E. The configuration must be operating in either Maximum Performance or Maximum Protection mode.
- F. Flashback Database must be enabled only on the Fast-Start Failover target standby database.
Answer: A,B,C
Explanation:
To enable Fast-Start Failover in a Data Guard environment, the following conditions must be in place:
The Data Guard environment must be managed by the Data Guard Broker (A): The Broker simplifies management tasks and is required to enable fast-start failover, which is an automatic failover mechanism provided by Data Guard.
You can specify only one standby database as the fast-start failover target (C): Fast-start failover is designed to fail over to a single, predetermined standby database, known as the target standby.
Flashback Database must be enabled on both the primary database and the Fast-Start Failover target standby database (F): Flashback Database provides a quick way to revert a database to a point in time before a logical or physical corruption or error occurred. It must be enabled on both the primary and target standby databases to allow for the possibility of reinstating the old primary as a standby after a failover.
Reference:
Oracle Data Guard Concepts and Administration Guide
Oracle Database High Availability Overview
NEW QUESTION # 70
Which THREE are always benefits of using a logical standby database?
- A. It can be used for database rolling release upgrades.
- B. It can be used as an updatable database for Real Application Testing and then converted back to a standby database without affecting the updates.
- C. It can be used to replicate a single pluggable database (PDB) in a multitenant container database.
- D. It can be used for testing patchsets without affecting the primary database.
- E. It provides a disaster-recovery solution with switchover and failover options that can recover any data updated on the primary database.
- F. It can be used for reporting workloads requiring additional indexes or materialized views or both.
Answer: A,E,F
Explanation:
Logical standby databases are a key feature of Oracle Data Guard and offer several distinct advantages, especially in terms of flexibility for reporting, upgrades, and disaster recovery:
* Disaster-recovery solution with switchover and failover options (A): Logical standby databases provide a robust disaster-recovery solution, ensuring that any data updated on the primary database can be recovered. They support both switchover and failover operations, allowing for smooth role transitions between the primary and standby databases.
* Used for reporting workloads requiring additional indexes or materialized views (B): Logical standby databases can be opened for read-write operations and can have additional indexes or materialized views that are not present in the primary database. This makes them ideal for offloading reporting and querying workloads from the primary database.
* Database rolling release upgrades (D): Logical standby databases can be used to perform rolling upgrades of the Oracle Database software. This allows the database to be upgraded with minimal downtime, as the standby database is upgraded first, followed by a switchover to make it the new
* primary.References:
* Oracle Data Guard Concepts and Administration Guide
* Oracle Database High Availability Overview
NEW QUESTION # 71
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. Configure Oracle Net connectivity on the primary host to the standby database instance.
- B. Establish user equivalence for the database software owner between the primary host and standby host.
- C. Set the DB_UNIQUE_NAME parameter on the primary database to a different value than that of the DB_NAME name parameter.
- D. startup nomount the standby database instance.
- E. Put the primary database into archivelog mode.
Answer: A,B,D
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 # 72
Which TWO statements are true for Data Guard environments with multi-tenant databases?
- A. The Data Guard broker automatically opens all pluggable databases of a primary database after a role change operation.
- B. Different pluggable databases within a logical standby database may have different guard statuses.
- C. The Data Guard broker automatically always opens the pluggable databases of a standby database after a role change operation.
- D. A multi-tenant standby database can have fewer pluggable databases than the primary container database.
- E. The CDBDBA privilege must be used instead of the SYSDBA privilege for connections as SYS to the root container of a multi-tenant standby database.
Answer: B,D
NEW QUESTION # 73
Which three are prerequisites for enabling Fast-Start Failover?
- A. The Data Guard environment must be managed by the Data Guard Broker.
- B. Flashback Database must be enabled on both the primary database and the Fast-Start Failover target standby database.
- C. You can specify only one standby database as the fast-start failover target.
- D. The maximum protection mode can be used, but with two or more standby databases.
- E. The configuration must be operating in either Maximum Performance or Maximum Protection mode.
- F. Flashback Database must be enabled only on the Fast-Start Failover target standby database.
Answer: A,B,C
Explanation:
To enable Fast-Start Failover in a Data Guard environment, the following conditions must be in place:
* The Data Guard environment must be managed by the Data Guard Broker (A): The Broker simplifies management tasks and is required to enable fast-start failover, which is an automatic failover mechanism provided by Data Guard.
* You can specify only one standby database as the fast-start failover target (C): Fast-start failover is designed to fail over to a single, predetermined standby database, known as the target standby.
* Flashback Database must be enabled on both the primary database and the Fast-Start Failover target standby database (F): Flashback Database provides a quick way to revert a database to a point
* in time before a logical or physical corruption or error occurred. It must be enabled on both the primary and target standby databases to allow for the possibility of reinstating the old primary as a standby after a failover.References:
* Oracle Data Guard Concepts and Administration Guide
* Oracle Database High Availability Overview
NEW QUESTION # 74
Which statement is true regarding Oracle Net connectivity for a Data Guard Broker configuration?
- A. A TNS entry enabling connectivity to the primary database instance must be defined on each of the standby database hosts.
- B. 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.
- C. 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.
- D. The LOCAL_LISTENER initialization parameter must be set to the listener used to register the primary database instance.
- 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 # 75
Which three statements are true about snapshot standby databases?
- A. Tablespaces can be dropped.
- B. The FATLOVER TO command results in a transition of a snapshot standby database to the primary role.
- C. Tables can be dropped.
- D. Tablespaces can be created.
- E. The switchover TO command allows a switchover operation to a snapshot standby database.
- F. A logical standby database can be converted into a snapshot standby database.
Answer: A,C,D
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 # 76
Which two statements are true regarding Data Guard environments in an Oracle Muti-tenant architecture?
- A. Standby redo log files are required for each pluggable database that is protected with Data Guard.
- B. PDB_FILE_NAME CONVERT must be set to enable creation of standby databases if they are created on the same host as the primary.
- C. The Data Guard broker may be used for multi-tenant databases.
- D. Different redo transport methods can be configured for different pluggable databases within one Data Guard environment.
- E. A Data Guard environment with a multi-tenant primary database can operate in any Protection mode.
Answer: C,E
Explanation:
Oracle Multi-tenant architecture and Data Guard have several interactions, but specific aspects hold true in such environments:
The Data Guard broker may be used for multi-tenant databases (B): Data Guard Broker simplifies the management and monitoring of Data Guard configurations and is fully compatible with the Oracle Multi-tenant architecture, allowing for easy management of Data Guard configurations that include multi-tenant container databases (CDBs) and their pluggable databases (PDBs).
A Data Guard environment with a multi-tenant primary database can operate in any Protection mode (E): Data Guard can be configured to operate in Maximum Performance, Maximum Availability, or Maximum Protection mode, regardless of whether the primary database is a multi-tenant database. This flexibility ensures that Data Guard can meet various data protection and availability requirements in multi-tenant environments.
Reference:
Oracle Data Guard Broker documentation
Oracle Multitenant Administrator's Guide
NEW QUESTION # 77
Which THREE statements are TRUE about the supported workload in Active Data Guard standby databases?
- A. PL/SQL blocks that you run on Active Data Guard standby databases can be always redirected to and run on the primary database.
- B. The DML operations on a standby can be transparently redirected to and run on the primary database
- C. The DDL operations on private temporary tables are transparently redirected to the primary database.
- D. Read-mostly reporting applications that use global temporary tables for storing temporary data can be offloaded.
- E. You might have to use sequences with global temporary tables to support read-mostly applications by using Active Data Guard.
Answer: B,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 # 78
You detected an unrecoverable archive gap in your data guard environment. So, you need to roll standby.
forward in time without applying a large number of archive log files using this command:
RMAN> RECOVER STANDBY DATABASE FROM SERVICE-<primary database name>;
When running this command, which of the following steps can be performed automatically?
1. Remember all data file names on the standby.
2. Restart standby in nomount.
3. Restore controlfile from primary.
4. Mount standby database.
5. Rename data files from stored standby names.
6. Restore new data files to new names.
7. Recover standby.
- A. 1,2,3,4,5,6,7
- B. 2,3,5,6,7
- C. 1,3,5,6,7
- D. 1, 2,3,4,6,7
- E. 2,3,6,7
Answer: D
Explanation:
The RECOVER STANDBY DATABASE FROM SERVICE command in RMAN is designed to automate various steps required to recover the standby database, especially when dealing with an archive gap. When this command is executed, the following actions can occur automatically:
Remember all data file names on the standby (1): RMAN has the capability to recall the names and paths of all data files associated with the standby database.
Restart standby in nomount (2): The standby database can be automatically restarted in the NOMOUNT state, allowing recovery operations to proceed without the database being open.
Restore controlfile from primary (3): RMAN can restore the control file from the primary database to the standby system, ensuring that the standby has the most up-to-date control file.
Mount standby database (4): After restoring the control file, the standby database is mounted to prepare for data file recovery.
Rename data files from stored standby names (5): Not typically done automatically by this command.
Restore new data files to new names (6): New data files added to the primary since the last synchronization can be restored to the standby with their correct names.
Recover standby (7): Finally, RMAN will apply any necessary redo logs to bring the standby database up to date with the primary.
While some steps, such as renaming data files (5), typically require manual intervention or scripting, most of the recovery process can be handled by RMAN automatically, streamlining the recovery of the standby database.
Reference:
Oracle Database Backup and Recovery User's Guide
Oracle Data Guard Concepts and Administration Guide
NEW QUESTION # 79
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. Creating a PDB from the existing PDB within the same CDB
- B. Performing transportable tablespaces
- C. Renaming a data file in the primary database
- D. Adding or dropping a redo file group
- E. Adding a data file or creating a tablespace
Answer: A,E
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 # 80
Which two are true about managing and monitoring Oracle container databases in a Data Guard environment using the broker?
- A. If the primary database is not a container database, then a standby may be a container database.
- B. All broker actions execute at the root container for container databases.
- C. If the primary database is a container database, then a physical standby may be a non-container database.
- D. After a role change, the broker opens all Pluggable databases (pdbb) on the new primary.
- E. If the primary database is a container database, then a logical standby may be a non-container database.
Answer: B,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 # 81
Examine the procedure that you plan to execute on your logical standby:
SQL> EXECUTE DBMS_LOGSTDBY.SKIP(stmt => 'DML', schema_name => 'HR', object_name => 'EMPLOYEE'); What is a prerequisite for execution of this procedure?
- A. Stop SQL Apply on the logical standby database.
- B. Stop redo transport to the logical standby database.
- C. Change the redo transport mode if necessary to ASYNC.
- D. Execute the DBMS_LOGSTDBY.APPLY_SET procedure to record errors that might cause SQL Apply to stop.
Answer: A
NEW QUESTION # 82
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, can be automatically recovered, using a block from the primary database.
- D. A corrupt block on a standby database with Real-Time Query enabled, is automatically recovered, using flashback logs from the standby database.
- E. 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.
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.
Reference:
Oracle Database Backup and Recovery User's Guide
NEW QUESTION # 83
Which THREE are among the various tasks performed by the Data Guard Monitor (DMON) process?
- A. communicating with dkon processes in other database instances that are part of the broker configuration
- B. maintaining information about all members of the broker configuration in binary configuration files.
- C. performing role transitions when switchover requests are made
- D. communicating with the DMON process of the observer to monitor a primary database in case a fast start failover is required
- E. activating role-based services appropriately in the various database instances of the configuration, based on the database role
Answer: B,C,E
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.
References:
* Oracle Data Guard Concepts and Administration
* Oracle Data Guard Broker documentation
NEW QUESTION # 84
Suppose that you manage the following databases in your environment:
* boston: Primary database with a single PDB called DEVI
* london: Physical standby database protecting the PDB called DEVI
* orcl: Stand-alone database with a single PDB called PDB1 as a remote clone source You are planning to run the following command to create a remote clone in the primary database (boston) using pdbi in orcl:
Which are the THREE prerequisites for automating instantiation of the PDB in the standby database (london)?
- A. Set standby_pdb_source_file_dblink to clone_link in the london database.
- B. Set STANDBY_FILE_MANAGEMENT to auto in the london database.
- C. Set STANDBY_PDB_SOURCE_FILE_DIRECTORY to <location of the PDB> in the london database.
- D. Enable Active Data Guard in the _ondon database.
- E. Open PDBI (remote clone source) in Read Only.
- F. Open PDBI (remote clone source) in Read Write.
Answer: B,C,E
Explanation:
To automate the instantiation of a PDB in the standby database after creating a remote clone in the primary database, certain conditions must be met:
Open PDBI (remote clone source) in Read Only (A): The source PDB from which the clone is created must be open in read-only mode to ensure a consistent state during cloning.
Set STANDBY_PDB_SOURCE_FILE_DIRECTORY to <location of the PDB> in the london database (C): This parameter specifies the location on the standby database where the files from the source PDB should be placed.
Set STANDBY_FILE_MANAGEMENT to auto in the london database (F): This parameter automates the management of file changes on the standby database when structural changes occur on the primary database, ensuring that the clone operation is reflected automatically on the standby.
Reference:
Oracle Multitenant Administrator's Guide
Oracle Data Guard Broker documentation
NEW QUESTION # 85
Your Data Guard environment has one physical standby database using Real-Time Query. Two sequences have been created by these SQL statements:
Neither sequence has been used since being created.
Session 1 connects to the primary database instance and issues these two SQL statements:
SELECT a.nextval FROM DUAL; SELECT b.nextval FROM DUAL;
Then session 2 connects to the physical standby database instance and issues the same SQL statements. Which output will be seen for session 2?
Then session 2 connects to the physical standby database instance and issues the same SQL statements. Which output will be seen for session 2?
- A.
- B.
- C.
- D.
Answer: C
Explanation:
In Oracle, a sequence created with the GLOBAL keyword is available and can produce values across all sessions and instances. However, a sequence created with the SESSION keyword is only specific to the session it was created in. When the NEXTVAL is called for a sequence, it will increment according to the sequence's properties set during its creation.
Given the sequence creation statements and the actions performed:
* The a sequence is global, which means it is available across the entire database, including the standby database with Real-Time Query enabled. So, when session 2 calls a.nextval, it will get the next value in the sequence, which is 21 since session 1 already retrieved 1.
* The b sequence is session-specific, so when session 2 calls b.nextval, it will get the value 1 because for this new session on the standby, this is the first time the sequence is being accessed.
Therefore, the output for session 2 will be a output as 21 and b output as 1, which corresponds to Option C.
References: The behavior of global vs session-specific sequences is outlined in Oracle's SQL Language Reference under the CREATE SEQUENCE statement documentation.
NEW QUESTION # 86
You are licensed to use Oracle Active Data Guard.
Which TWO statements are true after enabling block change tracking on a physical standby database?
- A. It allows fast incremental backups to be offloaded to the physical standby database.
- B. It starts the CTWR process on the primary database instance.
- C. It allows fast incremental backups to be offloaded to a snapshot standby database, when the physical standby database is converted.
- D. It starts the RVWR process on the physical standby database instance.
- E. It starts the CTWR process on the physical standby database instance.
- F. It allows fast incremental backups to be taken on the primary database.
Answer: A,D
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 # 87
You are monitoring your Data Guard broker configuration and issue this set of DGMGRL commands:
DGMGRL> SHOW CONFIGURATION;
Configuration - DRSolution
Protection Mode: MaxPerformance
Databases:
Close_by - Primary database
FS_inst - Far Sync
Far_away - Physical standby database
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS
What is true concerning this configuration?
- A. The Close_by primary database forwards redo to the Far_away physical standby directly and also sends redo to the FS_inst Far Sync instance.
- B. The Far Sync instance will not forward redo to the Far_away physical standby because Fast-Start Failover is disabled.
- C. The FS_inst Far Sync instance forwards redo to the Far_away physical standby only if the Close_by primary database is not able to do so.
- D. The Close_by primary database instance forwards redo to the FS_inst Far Sync instance, which forwards the redo in turn to the Far_away physical standby database instance.
- E. The Far Sync instance will not forward redo to the Far_away physical standby because the Protection mode is not MaxProtection.
Answer: D
NEW QUESTION # 88
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