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1z0-076證照指南 - 1z0-076考題寶典

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真實的1z0-076證照指南 |第一次嘗試輕鬆學習並通過考試，可信的1z0-076：Oracle Database 19c: Data Guard Administration

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最新的 Oracle Database 19c 1z0-076 免費考試真題 (Q52-Q57):

問題 #52
You must configure flashback database for your Oracle 19c databases that will be part of a Data Guard Broker configuration.
The databases are all in ARCHIVELOG mode.
You will execute the SQL statement:
ALTER DATABASE FLASHBACK ON;
Which three are true concerning this command?

A. It will execute successfully on an Oracle 19c logical standby database while SQL apply is active.
B. If executed successfully on an Oracle 19c primary database, flashback will also be enabled on all physical standby databases that are part of the configuration.
C. If executed successfully on an Oracle 19c primary database, flashback will also be enabled on all logical standby databases that are part of the configuration.
D. It will execute successfully while an Oracle 19c primary database is mounted.
E. It will execute successfully on an Oracle 19c physical standby database while Real Time Query is active.
F. It will execute successfully while an Oracle 19c primary database is open.

答案：A,D,F

解題說明：
The command ALTER DATABASE FLASHBACK ON; enables the Flashback Database feature, which provides a way to quickly revert an entire Oracle database back to a previous point in time. This command can be executed while an Oracle 19c primary database is either open (option A) or mounted (option B). It is also applicable to an Oracle 19c logical standby database while SQL Apply is active (option E). However, it's important to note that enabling Flashback Database on the primary does not automatically enable it on all associated standby databases, whether they are physical or logical. Each database in a Data Guard configuration must have Flashback Database explicitly enabled if desired. Real Time Query being active on a physical standby does not directly relate to the ability to execute this command on the standby. Reference: The explanation is based on Oracle's concepts for Flashback Technology and Data Guard configurations as detailed in the Oracle Database Backup and Recovery User's Guide and the Oracle Data Guard Concepts and Administration guide.

問題 #53
Which THREE statements are TRUE about Global Sequences when connected to a physical standby database with Real-Time Query enabled?

A. Their usage may have a performance impact on the physical standby database if the CACHE size is too small.
B. Their creation requires that a LOG archive_dest_n parameter be defined in the standby that points back to the primary.
C. If the CACHE option is set then the size of the cache must be at least 100.
D. They must have the NOORDEK and CACHE options set.
E. Their usage will always have a performance impact on the primary database.

答案：A,D,E

解題說明：
Global Sequences are Oracle sequences that generate unique values across multiple instances in an Oracle RAC or a Data Guard configuration. Regarding their behavior and performance when connected to a physical standby database with Real-Time Query enabled:
* A: The usage of Global Sequences can indeed have a performance impact on the primary database due to the need to generate unique values that are consistent across both primary and standby databases.
* D: The performance impact on the physical standby database may occur if the CACHE size is too small. This is because the standby database will frequently have to access the primary database to replenish the cache, which can increase the load and potentially lead to performance degradation.
* E: Global Sequences should have the NOORDER and CACHE options set. The NOORDER option ensures that sequence numbers are provided without guaranteeing sequence order, thus improving scalability and performance. The CACHE option is used to specify how many sequence values will be held in memory for faster access.
Option B is incorrect as the LOG_ARCHIVE_DEST_n parameter's definition for standbys pointing back to the primary does not directly pertain to the creation of sequences.
Option C is incorrect because there is no requirement that the size of the cache for a sequence must be at least
100. The CACHE size can be set to a different number based on specific use cases or performance considerations.
References: Oracle's documentation on sequences and their behavior in a Data Guard environment provides insights into the performance considerations and best practices for using sequences, particularly in a Real-Time Query context.

問題 #54
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. 0
B. 1
C. 3,4
D. 1,3,4
E. 1.4
F. 2,3,4

答案：E

解題說明：
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

問題 #55
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 increased number of bulk inserts on the primary
D. An undersized shared pool
E. An undersized undo tablespace on the logical standby
F. Many SQL apply operations do full table scans

答案：A,D,E,F

解題說明：
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.

問題 #56
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, 6, and 7
B. 1, 2, and 5
C. 1, 6, and 7
D. 1, 2, 3, 4, 5, 6, and 7
E. 1, 2, 3, 6, and 7

答案：D

解題說明：
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.
ReferencesOracle 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.

問題 #57
......

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