1Z0-076 Practice Questions

D . The database role indicated by FS_FAILOVER_STATUS as BYSTANDER implies that the database is a

standby database in the Data Guard configuration. This means the database is neither a primary

database nor an active failover target.

E . Since the FS_FAILOVER_OBSERVER_HOST column shows cats, it suggests that this is the host on

which the observer would run. However, because the FS_FAILOVER_OBSERVER_PRESENT column is

not shown, we cannot definitively state if the observer is currently connected or not. If

FS_FAILOVER_OBSERVER_PRESENT is 'YES', the observer is connected, if 'NO', then it's not. In the

absence of this column's output, the best assumption based on the available data is that the

observer is not connected.

The output shows that the FS_FAILOVER_STATUS is BYSTANDER, which indicates that the database in

question is not actively involved in a fast-start failover configuration as a primary or standby. It is in a

bystander role, meaning that while it is part of a Data Guard configuration, it is neither a target for

failover nor actively participating in failover operations. Additionally, FS_FAILOVER_OBSERVER_HOST

shows 'cats', which indicates the host where the observer process is expected to run. However, since

there is no information about the observer being present, we can infer that although 'cats' is

designated for the observer to run, the observer is not currently connected to this database.

Reference

Oracle documentation on Data Guard configurations and the V$DATABASE view which provides

information about the fast-start failover status and observer host.

Enterprise Manager Cloud Control provides a graphical interface to manage multiple standby databases, simplify switchovers and failovers, and automate failover processes to a specified target standby database. It offers a comprehensive view and control over the Data Guard configuration, making complex operations more manageable. DGMGRL is a command-line tool specifically designed for managing Data Guard configurations. It allows the administration of multiple standby databases, simplifies the execution of switchovers and failovers, reinstatements, and conversions to and from snapshot standby databases, and supports the automation of failover processes to a specified standby database. Other options like RMAN, SQL*Plus, CRSCTL, SRVCTL, and GDCCTL do not provide the same level of integrated management functionality for Data Guard environments as Enterprise Manager Cloud Control and DGMGRL.

When enabling fast-start failover, certain conditions must be met:

The fastStartFailoverTarget property is not set on Dogs (A): The primary database (Dogs) needs to

have a fast-start failover target configured for the operation to succeed.

The LogXptMode property is set to ASYNC on Sheep while Sheep is the target standby database (B):

Fast-start failover requires synchronous redo transport (SYNC or FASTSYNC) to ensure zero data loss,

which is a prerequisite for enabling the feature.

The LogXptMode property is set to ASYNC on Dogs (D): Similar to the previous point, the primary

database must be configured to use synchronous redo transport for the fast-start failover to be

possible.

Reference:

Oracle Data Guard Broker documentation

Oracle Database Error Messages Guide

:

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

Logical standby databases allow the execution of DDL and DML operations, which makes them

suitable for maintaining bitmap indexes and materialized views without affecting the performance of

the primary database .

Logical standby databases can be used for performing rolling upgrades and patching with minimum

downtime, meeting another requirement .

They also enable the testing of new application software releases against an up-to-date replica of the

primary database, fulfilling the last requirement.

Other configurations involving physical standby databases or combinations of logical and physical

standby databases might not meet all the specified requirements as efficiently or with the same level

of performance isolation for the primary database.

The Data Guard Monitor (DMON) process is a key component of Oracle Data Guard. It plays a crucial

role in managing and monitoring the state of both the primary and standby databases in a Data

Guard configuration.

Performing role transitions when switchover requests are made (A): DMON is responsible for

coordinating the switchover process between the primary and standby databases. This involves

safely transitioning the roles of the databases to ensure data protection and availability.

Maintaining information about all members of the broker configuration in binary configuration files

(B): DMON maintains detailed information about the databases in the Data Guard configuration,

including their roles, states, and network addresses. This information is stored in binary configuration

files, which are used by the Data Guard Broker to manage the Data Guard environment.

Activating role-based services appropriately in the various database instances of the configuration,

based on the database role (C): DMON activates services that are appropriate for the role of each

database in the Data Guard configuration. For example, it may activate different services on a

primary database than on a standby database, based on the specific requirements of each role.

Reference:

Oracle Data Guard Concepts and Administration

Oracle Data Guard Broker documentation

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

The EDIT DATABASE...SET PARAMETER command in Data Guard Management (DGMGRL) is used to

modify the value of initialization parameters for a database within a Data Guard configuration. This

command can be used to modify both static and dynamic parameters, but if a static parameter is

changed, the new value will take effect only after the database is restarted. The database must be up

and running for the command to execute, and the values set using the command are directly applied

to the specified database (in this case, 'boston') .

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