OCM OCM High Availability & Disaster Recovery

Question 1

In Oracle Data Guard, which role does the primary database's standby perform when it actively processes redo in real time?

Accepted Answer

Physical Standby in Maximum Availability mode

Answer

Snapshot Standby

Answer

Logical Standby

Answer

Far Sync Instance

Question 2

What is the primary purpose of a Far Sync instance in Oracle Data Guard?

Accepted Answer

Receive redo from the primary synchronously and forward it asynchronously to terminal standbys

Answer

Serve read-only queries to offload reporting from the primary

Answer

Act as a witness for Data Guard Fast-Start Failover

Answer

Host an Active Data Guard standby for zero-data-loss protection

Question 3

Which Oracle RAC component manages cluster membership and arbitrates split-brain scenarios?

Accepted Answer

Cluster Synchronization Services (CSS)

Answer

Grid Naming Service (GNS)

Answer

Oracle Cluster Registry (OCR)

Answer

Virtual IP (VIP)

Question 4

In Oracle RAC, what does Cache Fusion do?

Accepted Answer

Transfers data blocks between node buffer caches over the private interconnect to avoid disk reads

Answer

Merges UNDO segments across all nodes into a single tablespace

Answer

Fuses the redo streams from all instances into a single redo log

Answer

Merges duplicate index entries across RAC instances

Question 5

What is the Recovery Time Objective (RTO) primarily concerned with?

Accepted Answer

Maximum acceptable duration of downtime after a failure event

Answer

Maximum acceptable data loss measured in time

Answer

Frequency of database backups

Answer

Number of standby databases required

Question 6

Which RMAN command validates backup pieces and image copies without actually restoring them?

Accepted Answer

VALIDATE BACKUPSET

Answer

RESTORE … PREVIEW

Answer

CROSSCHECK BACKUP

Answer

LIST BACKUP