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1Z0-064 Exam Questions & Answers

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1Z0-064 Exam Questions & Answers

Vendor: Oracle

Certifications: Oracle Database

Exam Code: 1Z0-064

Exam Name: Oracle Database 12c: Performance Management and Tuning

Updated: Nov 25, 2024

Q&As: 119

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1Z0-064 Online Practice Questions and Answers

Questions 1

Identify two effects of the DB_FILE_MULTIBLOCK_READ_COUNT parameter on the optimizer. (Choose two.)

A. Decreasing the value of DB_FILE_MULTIBLOCK_READ_COUNT from the default increases the cost of index probes for DSS workloads.

B. A full table scan can become cheaper than index scans if the database instance has a high enough DB_FILE MULTIBLOCK_READ_COUNT for both OLTP and DSS workloads.

C. Increasing the value of DB_FILE_MULTIBLOCK_READ_COUNT within OS limits lowers the costing of an index probe that is done in conjunction with a nested loop for OLTP workloads.

D. In DSS workloads where full table scans may run in parallel and bypass the buffer cache, decreasing the value of DB_FILE_MULTIBLOCK_READ_COUNT from the default increases the cost of full table scans.

E. Increasing the value of DB_FILE_MULTIBLOCK_READ_COUNT within OS limits lowers the cost of full table scans and can result in the optimizer choosing a full table scan over an index scan for both OLTP and DSS workloads.

Show Answer
Questions 2

Your database supports a mixed workload. In an application, multiple complex queries with functions and expressions are executing. You want to analyze the queries that are currently cached in the library cache to receive recommendations about the usage of indexes and materialized views.

What should you do to achieve this? (Choose the best answer.)

A. Create an STS for the queries cached in the library cache and submit it as an input to SQL Tuning Advisor.

B. Create an STS for the queries cached in the library cache and submit it as an input to SQL Access Advisor.

C. Capture the workload in an STS and submit to SQL Tuning Advisor for recommendations.

D. Create an STS for the queries cached in the library cache and submit it as an input to SQL Performance Analyzer.

Show Answer
Questions 3

Examine the Load Profile section of an AWR report: Which two inferences can you derive from the details in this section? (Choose two.)

A. The values for Redo size and Block changes imply that only updates were performed by transactions.

B. The values for Parses (SQL) and Hard parses (SQL) imply that cursor sharing occurred quite often.

C. The values for DB Time and DB CPU imply that the database had a high proportion of idle time during the specified snapshot interval.

D. The values for SQL Work Area and User calls imply that only sort-based operations were performed.

E. The values for Logical reads and Physical reads imply that the number of disk reads per second was less than the total number of DB block reads and consistent gets per second.

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