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Oracle Database 19c: Data Guard Administration Sample Questions (Q71-Q76):

NEW QUESTION # 71
Which TWO are benefits of using Transaction Guard in a Data Guard environment?

A. It provides application continuity by rolling back uncommitted transactions interrupted by a failover or switchover.
B. It provides application continuity by replaying transactions interrupted by a failover or a switchover
C. It protects against logical corruptions being replicated to standby databases.
D. It protects against user errors being replicated to standby databases.
E. It protects against recoverable errors during a planned or an unplanned outage of a primary database.

Answer: A,E

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.References:
* Oracle Database High Availability Overview
* Oracle Real Application Clusters Administration and Deployment Guide

NEW QUESTION # 72
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. Lower DB_BLOCK_CHECKING to MEDIUM or low on the standby databases.
B. Decrease the redo log file size on the primary database.
C. Increase the size of the buffer cache on the physical standby database instances.
D. Increase the number of standby redo log files on the standby databases.
E. Increase the size of standby redo log files on the standby databases.

Answer: A,E

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 # 73
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 a standby database with Real-Time Query enabled, can be automatically recovered, using a block from the primary database.
B. 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.
C. A corrupt block on a standby database with Real-Time Query enabled, is automatically recovered, using flashback logs from the standby 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 the primary database is automatically recovered, using a block from a flashback log from the primary database.

Answer: D,E

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.
Reference:
Oracle Database Backup and Recovery User's Guide

NEW QUESTION # 74
Active Data Guard (ADG) databases are widely used to offload reporting or ad hoc query-only jobs from the primary database. Reporting workload profile is different from the primary database and often requires tuning.
Which tool is used to tune SQL workloads running on an ADG database?

A. SQL Tuning Advisor
B. Standby Statspack
C. Automatic Diagnostic Database Monitor (ADDM)
D. In-Memory Active Session History (ASH)
E. Automatic Workload Repository (AWR)

Answer: E

Explanation:
AWR collects, processes, and maintains performance statistics for problem detection and self-tuning purposes. In an Active Data Guard environment, where the physical standby database can be used for read-only workloads, AWR can be instrumental in identifying performance bottlenecks and areas for optimization. It provides detailed reports that include wait events, time model statistics, and active session history, making it an invaluable tool for tuning SQL queries and overall database performance in an ADG setup.

NEW QUESTION # 75
Which TWO statements are true about database parameters for databases in a Data Guard environment?

A. COMPATIBLE must have identical values for primary and standby databases.
B. LOG_FILE_NAME_CONVERT applies to online redo logs and archived logs.
C. The databases that are part of a Data Guard configuration must have different DB_UNIQUE_NAME initialization parameters.
D. If DB_RECOVERY_FILE_DEST is specified, then LOG_ARCHIVE_DEST_n is not required for local archive logs.
E. DB_FILE_NAME_CONVERT is only required if the standby database is on the same host as the primary database.

Answer: A,C

NEW QUESTION # 76
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