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NEW QUESTION # 59
Which THREE statements are TRUE about the supported workload in Active Data Guard standby databases?
- A. The DDL operations on private temporary tables are transparently redirected to the primary database.
- 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. Read-mostly reporting applications that use global temporary tables for storing temporary data can be offloaded.
- D. You might have to use sequences with global temporary tables to support read-mostly applications by using Active Data Guard.
- E. The DML operations on a standby can be transparently redirected to and run on the primary database
Answer: C,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.
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 # 60
There are currently 6 applief. and 6 pfepafef processes running and no idle applier processes on y logical standby database.
The max_SERVERS SQL apply parameter and number of archiver processes are both set to 12.
Identify two changes, each of which would allow you to increase the number of applier processes.
- A. Decrease the number of archiver processes on the standby database.
- B. Increase the RECOVERY_PARALLEL initialization parameter.
- C. Increase the parallel_max_server initialization parameter.
- D. Increase the processes initialization parameter. D Decrease the number of FREPARER processes.
- E. Increase the value for the MAX_SERVERS SQL apply parameter.
Answer: C,E
Explanation:
To increase the number of applier processes on a logical standby database, the following changes can be made:
* C: Increasing the value for the MAX_SERVERS SQL apply parameter would allow for more applier processes to be initiated, assuming that system resources permit.
* D: Increasing the PARALLEL_MAX_SERVERS initialization parameter would allow for more parallel execution processes, which can be used by SQL apply to increase the number of applier processes.
Option A is incorrect as decreasing the number of archiver processes will not necessarily increase the number of applier processes; these are unrelated components.
Option B is incorrect because the 'FREPARER' processes do not exist, it seems to be a typographical error, and the 'REPARER' is not a valid Oracle process or parameter.
Option E is incorrect because the RECOVERY_PARALLELISM parameter controls the number of processes used for instance recovery and media recovery, not for SQL apply.
References: Oracle Data Guard Concepts and Administration guide details the configuration and tuning of SQL apply-related parameters in logical standby databases.
NEW QUESTION # 61
Which two are true about the use of RMAN recovery catalogs when offloading backups to a physical standby database?
- A. Primary and physical standby databases may use different virtual recovery catalogs in the same physical recovery catalog.
- B. The primary and physical standby databases must be registered separately in the recovery catalog, if a far sync instance is used to route redo to the physical standby database.
- C. It is not necessary to use a recovery catalog unless a far sync instance is used to route redo to the physical standby database.
- D. It backups that are offloaded to a physical standby database are taken when not connected to a recovery catalog, then they may still be used for restoration on the primary database.
- E. The physical standby database may be used to register the database in the recovery catalog, if the primary is not registered.
Answer: A,D
NEW QUESTION # 62
Examine the fast-start failover configuration:
- A. You must disable fast-start failover first to change the fast-start failover target to East sales.
- B. If South_Sales develops a problem and cannot be the target of a failover, the broker automatically changes the fast-start failover target to one of the other candidate targets.
- C. The observer is running.
- D. A failover may occur if the observer has lost connectivity to the primary database, even if the Fast-Start Failover target standby database has a good connection to the primary database
- E. The observer will initiate a failover when the primary database is unable to produce local archived redo log files.
Answer: C,D,E
NEW QUESTION # 63
Which three statements are true about snapshot standby databases?
- A. Tablespaces can be dropped.
- B. Tables can be dropped.
- C. The switchover TO command allows a switchover operation to a snapshot standby database.
- D. Tablespaces can be created.
- E. The FATLOVER TO command results in a transition of a snapshot standby database to the primary role.
- F. A logical standby database can be converted into a snapshot standby database.
Answer: A,B,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 # 64
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 performs network connectivity checks between members of a broker configuration.
- D. The command performs a comparison of SPFILE entries between the primary database and a specified standby database.
- E. The command can be used for a logical standby database.
Answer: 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.
References:
* Oracle Data Guard Broker documentation
* Oracle Data Guard Concepts and Administration Guide
NEW QUESTION # 65
You are planning to perform block comparison using the dbms comp package:
Which TWO statements are true?
- A. It requires that the DB_LOST_WKITE_protect initialization parameter be enabled.
- 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 can be used to detect lost writes and inconsistencies between the primary database and the cascaded standbys.
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$SESSION_LONGOPS (D), which provides information on the operation's progress and estimated completion time.
References:Oracle Database PL/SQL Packages and Types Reference provides comprehensive details on the DBMS_COMPARISON package, including its procedures and how to monitor their progress. Additionally, Oracle Database Reference explains the V$SESSION_LONGOPS view, which is commonly used for monitoring long operations in the database.
NEW QUESTION # 66
You must configure an Oracle Data..........
1. A primary database
2. A physical standby database
Examine these requirements: 1. Data loss is not permitted.
1. Data loss is not permitted.
2. It should be possible to convert the physical standby database to a snapshot standby database.
3. Under normal operations, transactions should commit when redo is written to disk on the primary database and as soon as it has been received by the standby database instance.
4. The availability of the primary database should not be compromised by the availability of the standby database.
5. It should be possible to convert the physical standby database to a logical standby database
6. It should be possible to deploy Real Application Clusters on the primary database.
7. It should be possible to deploy Real Application Clusters on the physical standby database.
You configure SYNC redo transport mode in combination with Maximum Protection mode.
- A. 1, 2, and 5
- B. 1, 2, 3, 6, and 7
- C. 1, 6, and 7
- D. 1, 2, 6, and 7
- E. 1, 2, 3, 4, 5, 6, and 7
Answer: E
Explanation:
When SYNC redo transport mode is combined with Maximum Protection mode, it ensures that no data loss will occur (requirement 1). The physical standby can be converted to a snapshot standby (requirement 2) and later to a logical standby database (requirement 5), satisfying both transformation requirements. Transactions commit as soon as redo data is received by the standby database (requirement 3). The availability of the primary is not dependent on the standby database in Maximum Protection mode, as the primary database will halt if the standby cannot acknowledge the redo (requirement 4), thus indirectly ensuring its availability. It is also possible to deploy Real Application Clusters on both the primary (requirement 6) and the physical standby database (requirement 7), providing high availability and scalability.
Reference
Oracle Data Guard documentation detailing the requirements for different database roles, protection modes, and redo transport modes, as well as the capabilities and limitations of each configuration.
NEW QUESTION # 67
Which two statements are true regarding asynchronous redo transport in a Data Guard
- A. Real-time query performance on a physical standby database improves for current read requests when using this transport mode.
- B. The performance of SQL apply on a logical standby database always improves when using this transport mode.
- C. This transport mode satisfies the minimum requirements for Maximum Availability data protection mode.
- D. This transport mode satisfies the minimum requirements for Maximum Performance data protection mode.
- E. A transaction can commit without waiting for redo to be sent to any standby database in the data guard configuration.
Answer: D,E
Explanation:
Asynchronous redo transport is a method where the primary database does not wait for an acknowledgment from the standby database before committing transactions, which helps in minimizing the impact on the primary database's performance (B). This transport mode is associated with the Maximum Performance data protection mode, which prioritizes performance over synchronicity of data between the primary and standby databases (C). While it provides a level of data protection, there could be some data loss in the event of a primary database failure because redo data may not have been transmitted to the standby database at the time of the failure.
References:Oracle Data Guard Concepts and Administration documentation provides detailed explanations of different redo transport modes and their implications on data protection and performance. Asynchronous transport mode's behavior and association with Maximum Performance mode are outlined explicitly.
NEW QUESTION # 68
Which two statements are true when using non-rolling release upgrades in a Data Guard environment?
- A. The compatible parameter on a standby database that is applying redo, must be equal to or greater than the compatible parameter on the primary that is shipping redo to that standby.
- B. Modifications to the data dictionary on the primary database caused by the upgrade, are applied on a physical standby database.
- C. Modifications to the data dictionary on the primary database caused by the upgrade, are applied on a logical standby database.
- D. During the upgrade of a logical standby database, standby redo log files must reside on O/S file systems.
- E. User equivalence must be established for the owner of the Oracle software on the affected hosts prior to the upgrade.
Answer: A,B
Explanation:
The compatible parameter on a standby database that is applying redo, must be equal to or greater than the compatible parameter on the primary that is shipping redo to that standby (A): This ensures that the standby database can apply redo from the primary, even after the primary has been upgraded. The COMPATIBLE parameter setting on the standby database should not preclude it from understanding the redo it receives.
Modifications to the data dictionary on the primary database caused by the upgrade, are applied on a physical standby database (C): When the primary database undergoes a non-rolling upgrade, any resulting data dictionary changes are transmitted through redo data and applied to the physical standby database.
Reference:
Oracle Database Upgrade Guide
Oracle Data Guard Concepts and Administration Guide
NEW QUESTION # 69
Which two are true about database roles in an Oracle Data Guard configuration?
- A. A Physical Standby Database can be converted into a Logical Standby Database.
- B. A Snapshot Standby Database can be a fast-start failover target.
- C. A configuration consisting only of a primary and one or more physical standby databases can support a rolling release upgrade.
- D. A Logical Standby Database can cascade redo to a terminal destination.
- E. A Logical Standby Database can be converted to a Snapshot Standby Database.
Answer: A,C
Explanation:
A Physical Standby Database can indeed be converted into a Logical Standby Database, providing flexibility in a Data Guard configuration. This allows for the database to switch roles and supports SQL apply operations, enabling more granular control over the data and transactions being replicated and applied. Additionally, having a configuration with a primary database and one or more physical standby databases allows for rolling upgrades to be performed. This means that each database in the Data Guard configuration can be upgraded in a phased manner, minimizing downtime and ensuring high availability during the upgrade process.
NEW QUESTION # 70
A Data Guard environment has this configuration and these attributes:
The primary database prima is in the local region.
A physical standby database physt1 is in the local region.
A physical standby database physt2 is in a remote region.
The primary ships redo to physt1.
physt1 ships redo to physt2.
physt1 and physt2 have Real-Time Query enabled.
A sequence has been created with this SQL statement in the primary database:
CREATE SEQUENCE a NOCACHE SESSION;
Which TWO statements are TRUE?
- A. physt2 will no longer receive redo if physt1 becomes unavailable, unless LOG_ARCHIVE_DEST_n has the ALTERNATE attribute specified on the primary database.
- B. The sequence is usable on physt1 and physt2.
- C. physt2 will no longer receive redo if physt1 becomes unavailable, unless LOG_ARCHIVE_DEST_n has the ALTERNATE attribute specified on physt1.
- D. The sequence is usable on physt2 if physt1 becomes unavailable, but only if an alternate redo destination has been configured on the primary database.
- E. The sequence is usable on physt1 but not usable on physt2.
Answer: A,B
NEW QUESTION # 71
Which three Data Guard monitoring activities may be performed using Enterprise Manager Cloud Control?
- A. You can set a warning threshold on the redo generation rate metric for a physical standby database.
- B. You can monitor the redo apply rate on a snapshot standby database.
- C. You can check if redo apply needs to be tuned.
- D. You can set a critical threshold on the redo generation rate metric for a primary database.
- E. You can check the potential data loss in the event of a disaster.
- F. You can monitor the redo apply rate on a logical standby database.
Answer: D,E,F
NEW QUESTION # 72
Which TWO statements are true regarding Data Guard Broker?
- A. It automatically starts the DMON process for the database instances that are part of a Data Guard configuration.
- B. It automatically adds the primary database to an existing broker configuration when Enterprise Manager Cloud Control is used to create a standby.
- C. It can be used to perform failovers and switchovers.
- D. It can be used to create and manage standby databases.
- E. It can be used to monitor redo transport and log apply services.
Answer: C,D
NEW QUESTION # 73
You must propose an Oracle Data Guard configuration for a database supporting an OLTP workload that meets these permanent requirements:
Data loss is not permitted.
Read-only applications should not connect to the primary database instance.
Additionally, there are these requirements, only one of which is ever done at any one time:
It should be possible to apply and test designated patches with a minimum amount of downtime.
Upgrading to a new database release should be performed with the least possible amount of downtime.
New application software releases should be tested against an exact up-to-date replica of the production database.
You propose a primary database with one physical standby database configured in Maximum Protection mode.
Which requirements do you meet?
- A. 2, 3, 4, and 5
- B. 1 and 2
- C. Only requirement 1
- D. Only requirement 5
- E. 1, 2, 3, 4, and 5
Answer: C
NEW QUESTION # 74
Which TWO are benefits of using Transaction Guard in a Data Guard environment?
- A. It provides application continuity by replaying transactions interrupted by a failover or a switchover
- B. It protects against recoverable errors during a planned or an unplanned outage of a primary database.
- C. It protects against user errors being replicated to standby databases.
- D. It provides application continuity by rolling back uncommitted transactions interrupted by a failover or switchover.
- E. It protects against logical corruptions being replicated to standby databases.
Answer: B,D
Explanation:
Transaction Guard provides benefits in terms of transaction consistency and recovery in a Data Guard environment:
It provides application continuity by rolling back uncommitted transactions interrupted by a failover or switchover (B): Transaction Guard ensures that any uncommitted transactions at the time of an outage are rolled back consistently, thus preserving the integrity of the application's data and state.
It protects against recoverable errors during a planned or an unplanned outage of a primary database (D): Transaction Guard offers protection against errors that can occur during outages, allowing applications to resume operations more quickly and reliably after recovery.
Reference:
Oracle Database High Availability Overview
Oracle Real Application Clusters Administration and Deployment Guide
NEW QUESTION # 75
Which TWO statements are true about Real-Time Query?
- A. Real-Time Query sessions can be connected to a Far Sync instance.
- B. Setting standby_max_data_delay=0 requires synchronous redo transport.
- C. Disabling Real-Time Query prevents the automatic start of redo apply when a physical standby databases opened read only.
- D. A standby database enabled for Real-Time Query cannot be the Fast-Start Failover target of the Data Guard configuration.
- E. Real-Time Query has no limitations regarding the protection level of the Data Guard environment.
Answer: B,C
Explanation:
Real-Time Query is a feature that allows queries to be run on a physical standby database while it is applying redo data. The relevant truths about it are:
Setting standby_max_data_delay=0 requires synchronous redo transport (A): For the real-time apply feature to function with no data delay (zero delay), synchronous redo transport must be used. This setting ensures that the data on the standby database is as current as possible before queries are executed against it.
Disabling Real-Time Query prevents the automatic start of redo apply when a physical standby database is opened read-only (C): If Real-Time Query is disabled, opening the standby database in read-only mode will not start the redo apply process automatically. Redo apply needs to be manually started to synchronize the standby database with the primary.
Reference:
Oracle Data Guard Concepts and Administration Guide
NEW QUESTION # 76
Which three Data Guard monitoring activities may be performed using Enterprise Manager Cloud Control?
- A. You can set a warning threshold on the redo generation rate metric for a physical standby database.
- B. You can monitor the redo apply rate on a snapshot standby database.
- C. You can check if redo apply needs to be tuned.
- D. You can set a critical threshold on the redo generation rate metric for a primary database.
- E. You can check the potential data loss in the event of a disaster.
- F. You can monitor the redo apply rate on a logical standby database.
Answer: D,E,F
Explanation:
Enterprise Manager Cloud Control offers comprehensive monitoring capabilities for Oracle Data Guard environments. It enables monitoring the rate at which redo is being applied on a logical standby database (A), which is crucial for ensuring that the standby database is keeping up with the changes from the primary. It also allows setting thresholds on performance metrics, such as the redo generation rate on the primary database (B), to alert administrators when values exceed critical or warning thresholds. Additionally, it provides the capability to estimate the potential data loss in the event of a disaster (E), helping in disaster recovery planning and ensuring business continuity.
References:Oracle Enterprise Manager Cloud Control documentation provides extensive information on its monitoring features for Oracle Data Guard, including setting thresholds, estimating potential data loss, and tracking redo apply rates.
NEW QUESTION # 77
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. 3,4
- B. 1,3,4
- C. 1.4
- D. 0
- E. 2,3,4
- F. 1
Answer: C
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.
Reference:
Oracle Real Application Clusters Administration and Deployment Guide
Oracle Data Guard Concepts and Administration Guide
NEW QUESTION # 78
Which TWO statements are true about configuring Oracle Net Service in a Data Guard environment?
- A. It is necessary to use the failover clause for an address_list with multiple address lists in the tnsnames.ora file.
- B. Install the oracle-database-preinstall-19c package to set the kernel parameters for Oracle Net based on the Data Guard best practice guidelines.
- C. A static service must be registered with the local listener to enable DGMGRL to restart instances during the course of broker operations.
- D. Enterprise Manager does not require static service registration to restart instances during the course of broker operations.
- E. Installing the oracle-database-preinstall-19c package is NOT sufficient to set up operating system kernel parameters for Oracle Net.
Answer: C,E
Explanation:
A static service must be registered with the local listener to enable DGMGRL to restart instances during the course of broker operations (A): For DGMGRL (Data Guard Manager Command-Line Interface) to perform instance management operations, such as restarting instances, a static service registration in the listener is required. This allows the broker to connect to the database instance even when the instance is not fully up and the dynamic service registration is not available.
Installing the oracle-database-preinstall-19c package is NOT sufficient to set up operating system kernel parameters for Oracle Net (C): While the oracle-database-preinstall-19c package automates the setting of several kernel parameters to meet the preinstallation requirements for Oracle Database, it does not specifically tailor all settings for Oracle Net in a Data Guard configuration. Additional manual configuration may be required to optimize Oracle Net services for Data Guard operations.
Reference:
Oracle Data Guard Broker documentation
Oracle Net Services Administrator's Guide
NEW QUESTION # 79
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