Vendor: Oracle
Exam Code: 1Z0-064
Exam Name: Oracle Database 12c: Performance Management and Tuning
Certification: Oracle Certifications
Total Questions: 119 Q&A
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Updated on: Jun 19, 2026
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Which two statements are true about DB time in V$SYS_TIME_MODEL? (Choose two.)
A. DB time cannot exceed the total elapsed time (walk clock time) since the database instance started.
B. DB time cannot exceed the maximum number of concurrent sessions multiplied by the actual elapsed time for each session.
C. DB time includes the time spent on client processes and background processes.
D. Reducing DB time allows a database instance to support more user requests by using the same resources.
E. DB time is always greater than or equal to the DB CPU time.
You define the warning threshold for the tablespace usage metric for the USERS tablespace to be 60% and the critical threshold to be 80%.
Which two sources should you check for the alert information when either the warning or the critical threshold is exceeded? (Choose two.)
A. the alert log
B. Oracle Enterprise Manager Cloud Control
C. DBA_ALERT_HISTORY
D. DBA_OUTSTANDING_ALERTS
E. DBA_ACTIVE_SESSION_HISTORY
F. DBA_THRESHOLDS
Your database supports an online transaction processing (OLTP) workload. The database uses ASM storage. One of the ASM disks goes offline because of hardware failure. When the disk is replaced and then added back to the diskgroup, database performance is affected by rebalance operations.
Which two actions would you recommend to lower the impact of rebalance operations on the performance of the database? (Choose two.)
A. Increase the number of ASMB processes.
B. Decrease the value of the ASM_POWER_LIMIT parameter.
C. Set the DISK_REPAIR_TIME disk attribute to a lower value.
D. Specify the POWER clause with a lower value in an ALTER DISKGROUP statement.
E. Set the DISK_REPAIR_TIME disk attribute to a higher value.
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