Study HIGH Quality 1Z0-084 Free Study Guides and Exams Tutorials [Q18-Q32]

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Study HIGH Quality 1Z0-084 Free Study Guides and Exams Tutorials

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Oracle 1Z0-084 exam is a certification program designed for professionals who have expertise in managing performance and tuning Oracle Database 19c. 1Z0-084 exam is ideal for database administrators, developers, and other IT professionals who are responsible for managing large-scale databases. The 1Z0-084 exam covers topics such as performance tuning, SQL tuning, resource management, and diagnosing performance problems. Oracle Database 19c Performance and Tuning Management certification exam is designed to test the candidate’s proficiency in analyzing and optimizing database performance, troubleshooting common issues, and implementing best practices.

Q18. Which two statements are true about the use and monitoring of Buffer Cache Hit ratios and their value in tuning Database I/O performance?

The performance of workloads that primarily generate full table scans and fast full index scans are always affected by the cache hit ratio.

A 99% cache hit ratio can be observed for database instances which have very poor I/O performance.

The buffer cache advisory view v$db_cache_advice provides advice on cache hit ratios appropriate for the instance workload.

Both the RECYCLE and KEEP buffer caches should always have a very high cache hit ratio.

A 60% cache hit ratio can be observed for database instances which have very good I/O performance.

Q19. Examine this AWRreport excerpt:

You must reduce the impact of database I/O, without increasing buffer cache size and without modifying the SQL statements.
Which compression option satisfies this requirement?

MN STORE COMPRESS FOR QUERY LOW

STORE COMPRESS

ROW STORE COMPRESS ADVANCED

COLUMN STORE COMPRESS FOR QUERY HIGH

Q20. You must write a statement that returns the ten most recent sales. Examine this statement:

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

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

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

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

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

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

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.

Q21. Users complain about slowness and session interruptions. Additional checks reveal the following error in the application log:

Which file has additional information about this error?

Alert log

ASH report

Session trace file SQL trace file automatically generated by the error

SQL trace file automatically generated by the error

Q22. An Oracle 19c database uses default values for all optimizer initialization parameters.
After a table undergoes partition maintenance, a large number of wait events occur for:
cursor: pin S wait on X
Which command reduces the number of these wait events?

ALTER SYSTEM SET CURSOR_SHARING = FORCE;

ALTER SYSTEM SET CURSOR_SPACE_FOR_TIME – TRUE;

ALTER SYSTEM SET CURSOR_INVALIDATION = DEFERRED;

ALTER SYSTEM SET SESSION CACHED CURSORS = 500;

Q23. 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?

recommendations regarding the creation of additional indexes

recommendations regarding rewriting the SQL statements

recommendations regarding the creation of materialized views

recommendations regarding the creation of SQL Patches

recommendations regarding partitioning the tables

Q24. You need to collect and aggregate statistics for the ACCTG service and PAYROLL module, and execute:

Where do you find the output of this command?

By viewing V$SERV_MOD_ACT_STATS

In $ORACLE_BASE/diag/rdbms/<db unique name>/<instance name>/trace

By viewing V$SERVICE_STATS

In the current working directory

Q25. Examine this output of a query of VSPGA_TAPGET_ADVICE:

Which statements is true’

With a target of 700 MB or more, all multipass executions work areas would be eliminated.

PGAA_AGGREGATE should be set to at least 800 MB.

GGREGATE_TARGET should be set to at least 700 MB.

With a target of 800 MB or more, all one-pass execution work areas would be eliminated.

Q26. What is the right time to stop tuning an Oracle database?

When the allocated budget for performance tuning has been exhausted

When all the concurrency waits are eliminated from the Top 10

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

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

Q27. You must produce a consolidated formatted trace file by combining all trace files generated by all clients for a single service.
Which combination of utilities does this?

Trace Analyzer and Tracsess

Trcsess and TKPROF

Autotrace and TKPROF

TKPROF and Trace Analyzer

Q28. Which statement is true about DB time in V$$YS_TIME_MODEL?

DB time is organized as a simple list of statistics and any time period is attributable to only one statistic.

DB time can be many times greater than the elapsed time since the database instance started.

DB tine excludes the time spent waiting for a CPU in the operating system run queue.

DB time includes the time spent executing the RMAN backup and restore command.

Q29. Which two statements are true about disabling Automatic Shared Memory Management (ASMM)?

The SGA size remains unaffected after disabling ASMM.

All SGA components excluding fixed SGA and other internal allocations are readjusted immediately after disabling ASMM.

All SGA components retain their current sizes at the time of disabling.

It requires a database instance restart to take effect.

Both SGA_TARGET and SGA_MAX_SIZE must be set to zero.

All auto-tuned SGA components are reset to their original user-defined values.

Q30. Buffer cache access is too frequent when querying the SALES table. Examine this command which executes successfully:
ALTER TABLE SALES SHRINK SPACE;
For which access method does query performance on sales improve?

db file scattered read

db file sequential read

index full scan

index range scan

Q31. Which application lifecycle phase could be managed reactively?

Design and development

Upgrade or migration

Testing

Production

Deployment

Q32. A database supporting a mixed workload is hosted on a server with 64 CPUs.
A large number of free buffer waits and buffer busy waits occur affecting performance.
The buffer cache size was then increased but after a few hours, the same wait events occur more often than before the change.
Examine these parameter settings:

Which two actions can help reduce the number of these waits7

increasing the value of DB_FILE_MULTIBLOCK_READ_COUNT to 128

Increasing the size of MEMORYTARGET

setting dbwr_io_slaves to 64

increasing the value of DBWRITERPROCESSES to 64,

reducing the values of DB_FILE_MULTILOCK_READ_COUNT to 64

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