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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? (Choose two.)
Use Data Guard Redo Apply Best Practices
To improve the Redo Apply rate of a physical standby database (and media recovery):
* Set DB_CACHE_SIZE to a Value Greater than on the Primary Database
* Set DB_BLOCK_CHECKSUM=FULL and DB_BLOCK_CHECKING=MEDIUM or FULL
* Maximize I/O Rates on Standby Redo Logs and Archived Redo Logs
* Assess Recovery Rate
* Assess Database Wait Events
* Tune I/O Operations
* Assess System Resources
References:
https://docs.oracle.com/database/121/HABPT/config_dg.htm#HABPT4904
Which three are true concerning Automatic Block Media Recovery in a Data Guard environment when running an application as an ordinary Oracle user? (Choose three.)
B: For automatic block media recovery to work, a physical standby database must be in real-time query mode, which requires an Oracle Active Data Guard license.
D: A physical standby database operating in real-time query mode can be used to repair corrupt data blocks in a primary database.
C: If corruption occurs on the primary database, blockmedia recovery is performed automatically using a good copy of the block from the standby database and vice versa.
References:
https://ora600tom.wordpress.com/2013/09/07/abmr-automatic-block-media-recovery/
Your Data Guard environment consists of these components and settings:
1. A primary database supporting an OLTP workload
2. A remote physical standby database
3. Real-time query is enabled
4. The redo transport mode is set to SYNC.
5. The protection mode is set to Maximum Availability.
Which two are true regarding the DelayMins Database Property for the standby database? (Choose two.)
F: The DelayMins configurable database property specifies the number of minutes log apply services will delay applying the archived redo log data on the standby database.
References:
https://docs.oracle.com/cd/E11882_01/server.112/e40771/dbpropref.htm#DGBKR855
You must manually reinstate a database using DGMGRL.
To which database should you connect with DGMGRL before issuing the REINSTATE command and in which state should the target database be?
To reinstate the failed primary database, start it to the mounted state. Then run DGMGRL, connect to the new primary database and reinstate the old primary database.
References:
https://docs.oracle.com/cd/B28359_01/server.111/b28295/cli.htm
Which two statements are true regarding Data Guard Broker? (Choose two.)
B: The Data Guard monitor process (DMON) is an Oracle background process that runs for every database instance that is managed by the broker. When you start the Data Guard broker, a DMON process is created.
C: The following list describes some of the operations the broker automates and simplifies:
* Invoking switchover or failover with a single command to initiate and control complex role changes across all databases in the configuration.
Etc.
