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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?
Correct Answer: A,D
Explanation/Reference: 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