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  • Exam Name: Oracle Database 19c: Performance Management and Tuning
  • Last Update: 22-May-2024
  • Questions and Answers: 55
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1z0-084 Questions and Answers

Question # 1

What is the right time to stop tuning an Oracle database?

A.

When the allocated budget for performance tuning has been exhausted

B.

When all the concurrency waits are eliminated from the Top 10

C.

When the buffer cache and library cache hit ratio is above 95%

D.

When the I/O is less than 10% of the DB time

Question # 2

You want to reduce the amount of db file scattered read that is generated in the database.You execute the SQL Tuning Advisor against the relevant workload. Which two can be part of the expected result?

A.

recommendations regarding the creation of additional indexes

B.

recommendations regarding rewriting the SQL statements

C.

recommendations regarding the creation of materialized views

D.

recommendations regarding the creation of SQL Patches

E.

recommendations regarding partitioning the tables

Question # 3

You must write a statement that returns the ten most recent sales. Examine this statement:

1z0-084 question answer

Users complain that the query executes too slowly. Examine the statement's current execution plan:

1z0-084 question answer

What must you do to reduce the execution time and why?

A.

Create an index on SALES.TIME_ID to force the return of rows in the order specified by the ORDER BY clause.

B.

Replace the FETCH FIRST clause with ROWNUM to enable the use of an index on SALES.

C.

Collect a new set of statistics on PRODUCT, CUSTOMERS, and SALES because the current stats are inaccurate.

D.

Enable Adaptive Plans so that Oracle can change the Join method as well as the Join order for this query.

E.

Create an index on SALES.CUST_ID to force an INDEX RANGE SCAN on this index followed by a NESTED LOOP join between CUSTOMERS and SALES.

Question # 4

SGA_TARGET and PGA_AGGREGATE_TARGET are configured to nonzero values.

MEMORY_target is then set to a nonzero value but memory_MAX_TARG£T is not set.

Which two statements are true?

A)

1z0-084 question answer

B)

1z0-084 question answer

C)

1z0-084 question answer

D)

1z0-084 question answer

E)

1z0-084 question answer

F)

1z0-084 question answer

G)

1z0-084 question answer

A.

Option

B.

Option

C.

Option

D.

Option

E.

Option

F.

Option

G.

Option

Question # 5

Which three statements are true about tuning dimensions and details of v$sys_time_model and DB time?

A.

Statspack cannot account for high CPU time when CPU TIME is a Top 10 event in DB time. When CPU time is high, SQL tuning may improve performance.

B.

Systems in which CPU time is dominant need more tuning that those in which WAIT TIME is dominant.

C.

The proportion of WAIT TIME to CPU TIME always increases with increased system load.

D.

When WAIT TIME is high, instance tuning may improve performance.

E.

Parse Time Elapsed accounts for successful soft and hard parse operations only.

F.

DB Time accounts for all time used by background processes and user sessions.

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