Mar-2025 Pass Your 1Z0-084 Exam at the First Try with 100% Real Exam [Q24-Q48]

März 18, 2025 admin 0 Kommentare

5/5 - (1 Abstimmung)

Mar-2025 Pass Your 1Z0-084 Exam at the First Try with 100% Real Exam

Get Real Exam Questions for 1Z0-084 with New Questions

Oracle 1Z0-084 exam is a comprehensive certification that tests the candidates’ knowledge and skills in performance tuning and management of Oracle Database 19c. It is an essential certification for database administrators, performance analysts, and developers who want to improve the performance of their database systems. By earning the Oracle Certified Professional, Oracle Database 19c Performance and Tuning Management certification, candidates can demonstrate their proficiency in performance tuning and management, and improve their career prospects in the field of database management.

Oracle 1Z0-084 exam is designed to test a candidate’s knowledge and skills in managing and tuning the performance of an Oracle Database 19c system. 1Z0-084 exam is intended for database administrators, performance analysts, and technical consultants who are responsible for ensuring the optimal performance of Oracle Database systems. 1Z0-084 exam covers a range of topics, including database architecture, memory management, SQL tuning, and system troubleshooting.

NEUE FRAGE 24
Which procedure gathers statistics that are always used in the generation of any execution plan?

DBMS_STATS.GATHER_DICTIONARY_STATS

DBMS_STATS.GATHER_FIXED_ OBJECTS_STATS

DBMS_STATS.GATHER_DATABASE_STATS

DBMS_STATS.GATHER_SYSTEM_STATS

NEUE FRAGE 25
Database performance degraded between 23:15 and 23:30 for the last three nights. The awr snapshot interval is one hour. The AODM report contains nothing about this performance problem.
With which tool can you further analyze this problem?

SQL Performance Analyzer

AWR Compare Periods report

SQL Tuning Advisor

Active Session History report

NEUE FRAGE 26
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.

NEUE FRAGE 27
What are the least elevated values of statistics_level and C0NTR0LJ4ANAGEMENT_PACK_ACCESS that allow the usage of Monitoring of Database Operations?

STATISTICS_LEVEL=ALL and
CONTROL_MANAGEMENT_PACK_ACCESS=DIAGOSTIC+TUNING

STATISTICS_LEVEL=BASIC and CONTROL_MANAGEMENT_PACK ACCESS=DIAGOSTIC

STATISTICS_LEVEL=TYPICAL and CONTROL_MANAGEMENT_PACK_ACCESS-
DIAGOSTIC*TUNING

STATISTICS_LEVEL=TYPICAL and CONTROL_MANAGEMENT_PACK_ACCESS=DIAGOSTIC

NEUE FRAGE 28
You must configure and enable Database Smart Flash Cache for a database.
You configure these flash devices:

Examine these parameter settings:

What must be configured so that the database uses these devices for the Database Smart Flash Cache?

Set DB_FLASH_CACHE_SIZE to 192G and MEMORY_TARGET to 256G.

Set DB_FLASH_CACHE_SIZE parameter to 192G.

Disable Automatic Memory Management and set SGA_TARGET to 256G.

Set DB_FLASH_CACHE_SIZE to 256G and change device /dev/sdk to 128G.

Set DB_FLASH_CACHE_SIZE parameter to 128G, 64G.

NEUE FRAGE 29
You use SQL Tuning Advisor to tune a given SQL statement.
The analysis eventually results in the implementation of a SQL Profile.
You then generate the new SQL Profile plan and enforce it using a SQL PlanBaselinebut forget to disable the SQLProfile and a few days later you find out that the SQL Profile is generating a new execution plan.
Which two statements are true?

The existence of two concurrent plan stability methods generates a child cursor for every execution.

The SQL Profiles as well as SQL Plan Baseline are implemented using hints, so they both generate the same plan.

The execution plan is the one enforced by the SQL Profile.

The execution plan is the one enforced by the SQL Plan Baseline.

The SQL Plan Baseline must be accepted in order to be used for the execution plan.

The conflict between the two plan stability methods results in an error.

NEUE FRAGE 30
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.

NEUE FRAGE 31
18. The application provider has given full indications regarding the procedure to collect statistics.
To reduce the space used in the SYSAUX tablespace, you want to prevent the optimizer statistics Advisor from running.
Which method will allow you to do this?

Set the parameter OPTIMIZER_ADAPTIVE_STATISTICS to FALSE.

Use DBMS_AUTO_TASK_ADMIN. DISABLE to disable the AUTO_STATS_ADVISOR_TASK task.

Set the AUTO_STATS_ADVISOR_TASK global statistics preference to FALSE.

Use DBMS STATS.DROP ADVISOR TASK to drop the AUTO_STATS_ADVISOR_TASK task.

NEUE FRAGE 32
Examine this code block, which executes successfully:
DBMS_SERVER_ALERT. SET_THRESHOLD (
DBMS_SERVER_ALERT.CPU_TIME_PER_CALL, DBMS_SERVER_ALERT. OPERATOR_GE, ‘8000’, DBMS_SERVER_ALERT.OPERATOR_GE, ‘10000’, 1, 2, ‘inst1’, DBMS_SERVER_ALERT.OBJECT_TYPE_SERVICE, ‘main.regress.rdbms.dev.us.example.com’) ;

What will happen?

A warning alert will be issued when CPU time exceeds 1 minute for each user call.

A critical alert will be issued when CPU time exceeds 10000 microseconds for each user call.

A warning alert will be issued only when CPU time exceeds 10000 microseconds for each user call.

A critical alert will be issued when CPU time exceeds 2 minutes for each user call.

NEUE FRAGE 33
Which two statements are true about the use and monitoring of Buffer Cache Hit ratios and their value in tuning Database I/O performance?

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

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

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.

NEUE FRAGE 34
Which two options are part of a Soft Parse operation?

Syntax Check

SQL Row Source Generation

SQL Optimization

Shared Pool Memory Allocation

Semantic Check

NEUE FRAGE 35
Examine these commands, which execute successfully:

Which statement is true?

AD DM is enabled for all pluggable databases.

ADDM, AWR, and ASH reports can be purged automatically.

AWR- snapshots in all pluggable databases will be purgedautomatically after every 60 mins.

AWR snapshots can be purged manually in pluggable databases.

NEUE FRAGE 36
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

NEUE FRAGE 37
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.

NEUE FRAGE 38
Which Optimizer component helps decide whether to use a nested loop join or a hash join in an adaptive execution plan?

Statistics Feedback

SQL Plan Directives

Statistics Collector

Automatic Reoptimization

Dynamic Statistics

NEUE FRAGE 39
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;

NEUE FRAGE 40
Which two statements are true about session wait information contained in v$session or v$session_wait?

Rows for sessions displaying WAITED UNKNOWN TIME in the STATE column indicate that the session is still waiting.

Rows for sessions that are currently waiting have a wait time of 0.

Rows for sessions that are not waiting might contain the actual wait time for the last event for which they waited.

Rows for sessions that are currently waiting have their wait time incremented every microsecond.

Rows for sessions that are not waiting always contain the total wait time since the session started.

NEUE FRAGE 41
Examine this statement and its corresponding execution plan:

Which phase introduces the CONCATENATION step?

SQL Semantic Check

SQL Execution

SQL Row Source Generation

SQL Transformation

SQL Adaptive Execution

NEUE FRAGE 42
This error occurred more than four hours ago in the database:
ORA-04036 PGA memory used by theinstance exceedsPGA_AGGREGATE_LIMIT
You want to know which process and query were at fault.
Which two views should you use for this purpose?

DBA_HIST_ACTIVE_SESS_HISTORY

DBA_HIST_SQLSTAT

DBA_HIST_SQLTEXT

DBA_HIST_PGASTAT

DBA_HIST_PROCESS_MEM_SUMMARY

NEUE FRAGE 43
The CURS0R_SHARING and OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES parameters are set to default. The top five wait events in an awr report are due to a large number of hard parses because of several almost identical SQL statements.
Which two actions could reduce the number of hard parses?

Create the KEEP cache and cache tables accessed by the SQL statements.

Create the RECYCLE cache and cache tables accessed by the SQL statements.

Increase the size of the library cache.

Set OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES to TRUE.

Set the CURSOR_SHARING parameter to FORCE.

NEUE FRAGE 44
What are the least elevated values of statistics_level and C0NTR0LJ4ANAGEMENT_PACK_ACCESS that allow the usage of Monitoring of Database Operations?

STATISTICS_LEVEL=ALL and
CONTROL_MANAGEMENT_PACK_ACCESS=DIAGOSTIC+TUNING

STATISTICS_LEVEL=BASIC and CONTROL_MANAGEMENT_PACK ACCESS=DIAGOSTIC

STATISTICS_LEVEL=TYPICAL and
CONTROL_MANAGEMENT_PACK_ACCESS-DIAGOSTIC*TUNING

STATISTICS_LEVEL=TYPICAL and CONTROL_MANAGEMENT_PACK_ACCESS=DIAGOSTIC

NEUE FRAGE 45
A Standard Edition production database has performance problems for two hours on the same day each week.
Which tool must you use to diagnose the problem?

SQL Performance Analyzer

AWR Compare Periods report

Database Replay

Statspack report

NEUE FRAGE 46
Which three statements are true about using the in Memory (IM) column store?

It does not improve performance for queries using cached results of function evaluations on columns from the same table.

It does not improve performance for queries that use join groups on columns from different tables.

It can improve OLTP workload performance by avoiding the use of indexes.

It does not improve performance for queries using user-defined virtual column results.

It does not require all database data to fit in memory to improve query performance.

It improves performance for queries joining several tables using bloom filter joins.

NEUE FRAGE 47
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 partitioning the tables

recommendations regarding the creation of materialized views

recommendations regarding the creation of additional indexes

recommendations regarding rewriting the SQL statements

recommendations regarding the creation of SQL Patches

NEUE FRAGE 48
Which three statements are true about tuning dimensions and details of v$sys_time_model and DB time?

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.

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

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

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

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

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