Oracle Database 19c 1z1-076 Practice Test Engine: Try These 111 Exam Questions
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NEW QUESTION # 65
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 a standby database with Real-Time Query enabled.
- B. A corrupt block on the primary database is automatically recovered, using a block from a flashback log from the primary database.
- 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 the primary database can be automatically recovered, using a block from a standby database with Real-Time Query enabled.
- E. A corrupt block on a standby database with Real-Time Query enabled, is automatically recovered, using flashback logs from the standby database.
Answer: B,D
Explanation:
Automatic Block Media Recovery can be a significant feature for maintaining data integrity within a Data Guard configuration.
* A corrupt block on the primary database can be automatically recovered, using a block from a standby database with Real-Time Query enabled (A): When a corrupted block is encountered on the primary database, Oracle can automatically replace it with a good block from the standby database where Real-Time Query is enabled, leveraging the standby as a source of good data.
* A corrupt block on the primary database is automatically recovered, using a block from a flashback log from the primary database (E): If a good block version is available in the flashback logs of the primary database, Automatic Block Media Recovery can use it to recover the corrupted block on the primary.References:
* Oracle Database Backup and Recovery User's Guide
NEW QUESTION # 66
Which THREE are always benefits of using a logical standby database?
- A. It provides a disaster-recovery solution with switchover and failover options that can recover any data updated on the primary database.
- B. It can be used for reporting workloads requiring additional indexes or materialized views or both.
- C. It can be used for testing patchsets without affecting the primary database.
- D. It can be used as an updatable database for Real Application Testing and then converted back to a standby database without affecting the updates.
- E. It can be used to replicate a single pluggable database (PDB) in a multitenant container database.
- F. It can be used for database rolling release upgrades.
Answer: A,B,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 # 67
Your Data Guard environment has a remote physical standby database with real-time query enabled, which is used for reporting, and a logical standby database used for DSS reporting.
Switchovers or failovers are possible due to testing or in case of a disaster.
Clients use local TNSNAMES.ORA files to define connection strings to the database instances.
Which three will prevent clients from connecting to the wrong database instances?
- A. The LOCAL_LISTENER parameter on the primary database instance must always be set.
- B. The standby database services must be defined statically with the Listeners running on the standby database hosts.
- C. Client TNS entries for the databases use the correct service names for the intended service.
- D. A service name is registered with the local listener of each database instance.
- E. Oracle Net connectivity to the primary database instance must be established on all the standby database instances.
- F. The DB_NAME and DB_UNIQUE_NAME parameters must be set to the same value for all the databases in the Data Guard environment.
- G. The client applications must use the correct TNS entries when requesting connections to the database instances.
Answer: B,C,G
Explanation:
Based on Oracle Database 19c: Data Guard Administration documents, the three measures that can prevent clients from connecting to the wrong database instances during switchovers, failovers, or regular operations in a Data Guard environment are:
* B. The standby database services must be defined statically with the Listeners running on the standby database hosts.
* D. The client applications must use the correct TNS entries when requesting connections to the database instances.
* E. Client TNS entries for the databases use the correct service names for the intended service.
* In an Oracle Data Guard configuration, correctly configuring Oracle Net Services (including TNS entries and listeners) is crucial for ensuring that clients connect to the appropriate database instance, whether it's the primary or standby. Defining services on the standby database and associating them with listeners ensures that client applications can connect to the standby when needed, especially useful in a role transition or when the standby is open for read-only access or real-time query. It's essential that TNS entries used by client applications specify the correct service names that correspond to the intended
* database roles, such as primary or standby. This setup facilitates seamless connectivity to the appropriate instance based on the role, especially critical during switchovers and failovers when the roles of the databases change.
* References:Oracle's Data Guard concepts and administration guide provides extensive information on configuring network services for Data Guard environments, ensuring that applications connect to the correct database instance based on the current role of the databases in the Data Guard configuration.
NEW QUESTION # 68
Which three are prerequisites for using Data Guard Broker?
- A. A statically defined listener end-point must be registered with the local listener on the servers hosting the standby database instances.
- B. If any database in the configuration is a RAC database, then the broker configuration files must reside in shared storage accessible by all database instances for all databases in the broker configuration.
- C. The broker configuration files for a RAC database must reside in shared storage accessible by all the RAC database instances.
- D. The primary and standby databases must run the same version of the Oracle Database server.
- E. Network connectivity to the primary database instance must be defined on the servers hosting the standby database instances.
- F. DG_BROKEB_START must be set to TRUE for a database instance before adding the database to the broker configuration.
Answer: B,D,E
Explanation:
Data Guard Broker is a management tool that simplifies the configuration, management, and monitoring of Data Guard environments. The prerequisites for using Data Guard Broker include:
* The primary and standby databases must run the same version of the Oracle Database server (A):
This ensures compatibility between the primary and standby databases and enables seamless role transitions and data synchronization.
* Network connectivity to the primary database instance must be defined on the servers hosting the standby database instances (B): Proper network connectivity is essential for communication between the primary and standby databases, allowing for the replication of data and the synchronization of changes.
* If any database in the configuration is a RAC database, then the broker configuration files must reside in shared storage accessible by all database instances for all databases in the broker configuration (D): In Real Application Clusters (RAC) environments, shared storage ensures that all instances of the RAC database can access the broker configuration files, facilitating the management of the Data Guard environment across all instances.References:
* Oracle Data Guard Broker documentation
* Oracle Real Application Clusters Administration and Deployment Guide
NEW QUESTION # 69
You are planning to perform block comparison using the dbms comp package:
Which TWO statements are true?
- A. It can be used to detect lost writes and inconsistencies between the primary database and the cascaded standbys.
- B. The databases should be at least mounted before block comparison.
- C. You can monitor the progress of an ongoing block comparison operation by querying VS SES SION_LONGOPS.
- D. Logical standby databases can be the target database for the dbms_dbcomp.dbcomp procedure.
- E. It requires that the DB_LOST_WKITE_protect initialization parameter be enabled.
Answer: B,C
Explanation:
The DBMS_COMPARISON package, used for comparing and converging data objects within a single database or between databases, requires that the databases involved in the block comparison be at least mounted (A). This allows the procedure to access the data blocks for comparison. Additionally, the progress of long-running operations such as block comparison can be monitored using the dynamic performance view V$SESSION_LONGOPS (D), which provides information on the operation's progress and estimated completion time.
Reference:
Oracle Database PL/SQL Packages and Types Reference provides comprehensive details on the DBMS_COMPARISON package, including its procedures and how to monitor their progress. Additionally, Oracle Database Reference explains the V$SESSION_LONGOPS view, which is commonly used for monitoring long operations in the database.
NEW QUESTION # 70
Your expertise is requested for these customer requirements:
The Data Guard environment must be in maximum protection mode.
Reports must be offloaded to a physical standby database.
There must be no lag between the primary and standby databases that affect the reports produced.
The primary database must be resilient in case of a single network failure.
Which solution is correct for these requirements?
- A. Two standby databases, at least one of them a physical standby with Real-Time Query enabled and the STANDBY_MAX_DATA_DELAY parameter set to zero, receiving redo from the primary with asynchronous transport
- B. Two standby databases, at least one of them a physical standby with Real-Time Query enabled and the STANDBY_MAX_DATA_DELAY parameter set to zero, receiving redo from the primary with synchronous transport
- C. Two physical standby databases with Real-Time Query enabled, receiving redo from the primary with the LOG_ARCHIVE_DEST_n attributes SYNC NOAFFIRM to minimize the performance impact on the primary
- D. One physical standby database with Real-Time Query enabled and STANDBY_MAX_DATA_DELAY parameter set to zero, receiving redo from the primary with synchronous transport
- E. One physical standby database with Real-Time Query enabled, receiving redo from two Far Sync instances that are connected to the primary
Answer: B
NEW QUESTION # 71
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. Decrease the redo log file size on the primary database.
- B. Increase the number of standby redo log files on the standby databases.
- C. Lower DB_BLOCK_CHECKING to MEDIUM or low on the standby databases.
- D. Increase the size of standby redo log files on the standby databases.
- E. Increase the size of the buffer cache on the physical standby database instances.
Answer: C,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 # 72
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 asyn: for the standby database Cats.
- B. The redo transport mode is set to async for both standby databases.
- 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 # 73
Which two Data Guard features require the use of flashback database by the broker?
- A. Far Sync Instances
- B. Read-Mostly physical standby implementations
- C. Fast-Start Failover
- D. Real Time Query
- E. Snapshot Standby databases
Answer: C,E
NEW QUESTION # 74
Which two statements are true regarding Data Guard environments in an Oracle Muti-tenant architecture?
- A. Different redo transport methods can be configured for different pluggable databases within one Data Guard environment.
- B. The Data Guard broker may be used for multi-tenant databases.
- C. A Data Guard environment with a multi-tenant primary database can operate in any Protection mode.
- D. PDB_FILE_NAME CONVERT must be set to enable creation of standby databases if they are created on the same host as the primary.
- E. Standby redo log files are required for each pluggable database that is protected with Data Guard.
Answer: B,C
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 # 75
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 logical 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 be used to flash back a physical standby that receives redo from a far sync instance.
- D. It may not be used to flash back a primary database after a failover to a physical standby.
- E. When a flashback database operation is performed on a primary database, a physical standby database is also flashed back automatically.
- F. You can use it when real-time apply is enabled in case the physical standby suffers from logical corruption.
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.References:
* Oracle Database Backup and Recovery User's Guide
* Oracle Data Guard Concepts and Administration
NEW QUESTION # 76
Your Data Guard environment contains a four-instance RAC primary database whose SID is PROD and a RAC physical standby database whose std is PROD_SBY.
Examine the command executed on a node of the primary database cluster to create a service OLTPWORKLOAD that the applications will use to connect to the database when it is in the FRlMARYTclatabase role:
srvctl add service -db PROD -service oltpworkload -role PRIMARY -failovertype SESSION -failovermethod BASIC -failoverdelay 10 -failoverretry 150 The service is then started Consider this list of tasks:
1. On a node of the standby database cluster execute:
srvctl add service -db PROD_SBY -service oltpworkload -role PRIMARY -failovertype SESSION
-failovermethod BASIC -failoverdelay 10 -failoverretry 150
2. On the primary database, create the oltpworkload database service using the dbms_service.create_service procedure.
3. Configure tap for clients in the tnsnames.ora files.
4. Make sure clients use the OLTPWORKLOAD service to connect to the database instances.
5. On the standby database, create the oltpworkload database service using the dbms_service.create_servi;l procedure.
Identify the required steps to configure and use Transparent Application Failover (taf).
- A. 1.4
- B. 2,3,4
- C. 0
- D. 1,3,4
- E. 1
- F. 3,4
Answer: A
Explanation:
To set up Transparent Application Failover (TAF) in a Data Guard environment with RAC, you would need to:
* On a node of the standby database cluster, execute the srvctl command to add the oltpworkload service for the PRIMARY role (1): This prepares the standby cluster to provide the oltpworkload service in case a failover occurs, and the standby becomes the primary database.
* Make sure clients use the OLTPWORKLOAD service to connect to the database instances (4):
This ensures that client connections are directed to the correct service, which is managed by TAF and can fail over in case of a primary database outage.References:
* Oracle Real Application Clusters Administration and Deployment Guide
* Oracle Data Guard Concepts and Administration Guide
NEW QUESTION # 77
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 logical 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 be used to flash back a physical standby that receives redo from a far sync instance.
- D. It may not be used to flash back a primary database after a failover to a physical standby.
- E. When a flashback database operation is performed on a primary database, a physical standby database is also flashed back automatically.
- F. You can use it when real-time apply is enabled in case the physical standby suffers from logical corruption.
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 # 78
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. 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. If the primary database is a container database, then a logical standby may be a non-container database.
- E. If the primary database is not a container database, then a standby may be a container database.
Answer: A,B
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 # 79
You must configure on Oracle Data .......
1. A primary database
2. Three Physical Standby Databases
Examine these requirements:
A designated physical standby database should become the primary database automatically whenever the primary database fails.
2. The chosen protection mode should provide the highest level of protection possible without violating the other requirement.
Which redo transport mode and protection mode would you configure to meet these requirements?
- A. FASTSYNC and Maximum Protection
- B. FASTSYNC and Maximum Availability
- C. SYNC and Maximum Protection
- D. ASYNC and Maximum Performance
Answer: B
Explanation:
To meet the requirements of automatic failover and the highest level of protection without data loss, the combination of FASTSYNC redo transport mode and Maximum Availability protection mode is appropriate. FASTSYNC ensures that the performance impact on the primary database is minimized while still providing synchronous transport. Maximum Availability protection mode offers the highest level of data protection without compromising the availability of the primary database. In case of a network failure or a standby failure, the primary will not halt, avoiding disruption to the primary database operations.
Reference
Oracle Data Guard Concepts and Administration guide, which details the different protection modes and their respective levels of data protection and impact on database operations.
NEW QUESTION # 80
Which three statements are true about redo transport?
- A. Multiple RFS processes may receive redo on one far sync instance.
- B. With synchronous redo transport, LGWR ships redo directly to RFS processes on the standby database instances and waits for an acknowledgment.
- C. With asynchronous redo transport, TTnn processes may read redo from the log buffer or from standby redo logs on the primary database.
- D. An RFS process on a standby database instance may receive redo from an archiver process on the primary database instance to perform archive gap resolution.
- E. Multiple RFS processes may receive redo on one standby database instance.
Answer: B,D,E
NEW QUESTION # 81
Which three can be done using Data Guard Broker?
- A. Create a new physical standby database.
- B. Automating failover to a specified target standby database.
- C. Configuring the standby control file, server parameter file, and data files for a standby database.
- D. Monitoring and managing redo transport services, and log apply services.
- E. Define logical standby database skip rules.
- F. Converting physical standby databases to snapshot standby databases.
Answer: A,B,F
NEW QUESTION # 82
Which two are prerequisites for configuring flashback database for Oracle 19c databases, in a Data Guard environment?
- A. The database must be in ARCHTVELOG mode.
- B. The Data Guard real-time apply feature must be enabled.
- C. A fast recovery area must be configured.
- D. The data guard broker must be used.
- E. A far sync instance must be configured to flash back a standby when the primary has been flashed back.
Answer: A,C
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 # 83
Your Data Guard configuration consists of these components and settings:
1. A primary database
2. A remote physical standby database
3. Real-time query is enabled
4. Redo transport mode is synchronous
5. Protection mode is maximum availability
6. The Data Guard broker is used
You notice that the standby destination fails to acknowledge reception of redo within net_timeout period of time.
Which is true in this scenario?
- A. The protection mode will automatically change to Maximum Performance.
- B. Synchronous redo transport mode connections to the standby database are terminated.
- C. The physical standby database instance is shut down by the Data Guard broker.
- D. Real-time query will be disabled on the physical standby.
Answer: B
Explanation:
In a Data Guard configuration where the protection mode is set to Maximum Availability and synchronous redo transport is enabled, if the standby destination fails to acknowledge the reception of redo within the net_timeout period, the primary database will terminate the synchronous redo transport mode connections to the standby database to protect the primary database from hanging (C). The primary database then operates in a Maximum Performance mode until the issue is resolved. This behavior ensures that the primary database can continue to process transactions even when the standby database is temporarily unavailable.
Reference:
The Oracle Data Guard Broker documentation and Oracle Data Guard Concepts and Administration guide detail the behavior of different protection modes and the response to network timeouts, including the fallback to asynchronous redo transport to maintain primary database availability.
NEW QUESTION # 84
Which THREE statements are true........ open in real time query mode, which becomes a new.
- A. Sessions that are using database links
- B. User sessions can be retained.
- C. All current buffers can be retained.
- D. All sessions are disconnected and all
- E. User sessions and Current Buffers are maintained by default.
- F. Sessions that have long running queries can be retained.
Answer: B,C,D
Explanation:
When a physical standby database is opened in real-time query mode, which may be referred to as real-time apply when using Active Data Guard, certain operations can disrupt ongoing sessions. However, with features like Application Continuity and the proper configuration of initialization parameters such as STANDBY_DB_PRESERVE_STATES, user sessions and current buffers may be preserved during role transitions such as a switchover or failover. Specifically, the STANDBY_DB_PRESERVE_STATES parameter can be set to preserve none, all, or only user sessions during such transitions. This ensures that in-flight transactions are not lost and that users do not experience disruptions during the role transitions of a physical standby database.
Reference
Oracle Data Guard Concepts and Administration
Oracle Database Licensing Information User Manual
Oracle Data Guard Broker User Manual
NEW QUESTION # 85
Which THREE are always benefits of using a logical standby database?
- A. It provides a disaster-recovery solution with switchover and failover options that can recover any data updated on the primary database.
- B. It can be used for reporting workloads requiring additional indexes or materialized views or both.
- C. It can be used for testing patchsets without affecting the primary database.
- D. It can be used as an updatable database for Real Application Testing and then converted back to a standby database without affecting the updates.
- E. It can be used to replicate a single pluggable database (PDB) in a multitenant container database.
- F. It can be used for database rolling release upgrades.
Answer: A,B,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.
Reference:
Oracle Data Guard Concepts and Administration Guide
Oracle Database High Availability Overview
NEW QUESTION # 86
Which FOUR database parameters might be affected by or influence the creation of standby databases?
- A. ARCHIVE_LAG_TARGET
- B. db_file_name_convert
- C. DB_NAME
- D. STANDBY_ARCHIVE_DEST
- E. COMPATIBLE
- F. FALSERVER
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
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