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1z0-076試験の準備方法|正確的な1z0-076日本語版復習指南試験|ユニークなOracle Database 19c: Data Guard Administration練習問題集
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Oracle Database 19c: Data Guard Administration 認定 1z0-076 試験問題 (Q82-Q87):
質問 # 82
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, 3, 6, and 7
- B. 1, 2, 6, and 7
- C. 1, 2, and 5
- D. 1, 6, and 7
- E. 1, 2, 3, 4, 5, 6, and 7
正解:E
解説:
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.
質問 # 83
Which three are true about using Flashback database through role transitions in a Data Guard environment?
- A. Physical standby databases retain their current role when you flash back to a point in time before the switchover occurred which caused this database to become a physical standby.
- B. Physical standby databases retain their current role when you flash back to a point in time before a reinstate occurred which caused this database to become a physical standby.
- C. Logical standby database roles are reverted to their original role when you flash back to a point in time before the switchover occurred which caused this database to become a logical standby.
- D. Flashback database may not be used to undo a physical standby database activation.
- E. Logical standby databases retain their current role when you flash back through to a point in time before the switchover occurred which caused this database to become a logical standby.
正解:A、B、D
質問 # 84
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. If the CACHE option is set then the size of the cache must be at least 100.
- C. Their usage will always have a performance impact on the primary database.
- D. Their creation requires that a LOG archive_dest_n parameter be defined in the standby that points back to the primary.
- E. They must have the NOORDEK and CACHE options set.
正解:A、C、E
解説:
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.
質問 # 85
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 starts the CTWR process on the primary database instance.
- B. It starts the RVWR process on the physical standby database instance.
- C. It allows fast incremental backups to be taken on the primary database.
- D. It allows fast incremental backups to be offloaded to the physical standby database.
- E. It allows fast incremental backups to be offloaded to a snapshot standby database, when the physical standby database is converted.
- F. It starts the CTWR process on the physical standby database instance.
正解:B、D
解説:
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
質問 # 86
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
- E. 3,4
- F. 1,3,4
正解:A
解説:
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
質問 # 87
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