1Z0-084 100% Pass Guaranteed Download Oracle Database 19c Exam PDF Q&A [Q19-Q40]

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1Z0-084 100% Pass Guaranteed Download Oracle Database 19c Exam PDF Q&A

1Z0-084 Practice Test Dumps with 100% Passing Guarantee

The Oracle 1Z0-084 exam covers a wide range of topics related to performance and tuning management. These topics include database performance tuning, performance monitoring, SQL tuning, indexing strategies, and more. Candidates are expected to have a strong understanding of these topics and be able to apply their knowledge to real-world situations.

Earning the Oracle 1Z0-084 certification demonstrates the candidate’s proficiency in database performance and tuning management. Oracle Database 19c Performance and Tuning Management certification is recognized globally and can enhance career opportunities for professionals working in the database administration field. Oracle certification holders are highly valued by employers, as they demonstrate a commitment to ongoing learning and professional development.

NO.19 Which two Oracle Database features use database services?

Oracle Automatic Reoptimization

Database Resource Manager

Oracle SQL Performance Management

Oracle SQL Tuning Advisor

Oracle Scheduler

NO.20 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.

NO.21 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.

NO.22 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.

NO.23 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

NO.24 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.

NO.25 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

NO.26 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.

NO.27 Examine this statement and output:

Which two situations can trigger this error?

The user lacks the required privileges to execute the DBMS WORKLOAD CAPTURE package or the directory.

There is a file in the capture directory.

The syntax is incomplete.

The capture directory is part of the root file system.

The instance is unable to access the capture directory.

NO.28 A database instance is suffering poor I/O performance on two frequently accessed large tables.
No Big Table caching occurs in the database.
Examine these parameter settings:

Which are two actions either one of which will allow Big Table caching to occur?

Increasing DB_BIG_TABLE_CACHE_PERCENT_TARGET to at least 50

Setting DB_KEEP_CACHE_SIZE to at least 50M

Increasing DB_BIG_TABLE_CACHE_PERCENT_TARGET to at least 25

Increasing DB_CACHESIZE to 1 G

Setting PARALLEL_DEGREE_POLICYADAPTIVE

Setting PARALLEL_DEGREE_POLICYAUTO

NO.29 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.

NO.30 Which two options are part of a Soft Parse operation?

Syntax Check

SQL Row Source Generation

SQL Optimization

Shared Pool Memory Allocation

Semantic Check

NO.31 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;

NO.32 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

NO.33 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.

NO.34 You manage a 19c database with default optimizer settings.
This statement is used extensively as subquery in the application queries:
SELECT city_id FROM sh2.sales WHERE city_id=:Bl
You notice the performance of these queries is often poor and, therefore, execute:
SELECT city_id,COUNT(*) FROM sh2.sales GROUP BY city_id;
Examine the results:

There is no index on the CITY_ID column.
Which two options improve the performance?

Generate frequency histograms on the CITY__ID column.

Create an index on the CITY IP column.

Use a SQL Profile to enforce the appropriate plan.

Force the subquery to use dynamic sampling.

Activate the adaptive plans.

NO.35 Which two statements are true about Data Pump import for objects that used the in Memory (IM) column store in their source database?

It always gives preference to the IM column store clause defined at the tablespace level over table-level definitions.

It must always transports existing INMEMORY attributes.

Its INMEM0RY_CLAUSE of the Data Pump Export allows modifications to IM column store clause of a table with existing INMEMORY setting.

Its TRANSFORM clause can be used to add the INMEMORV clause to exported tables that lack them.

It ignores the IM column store clause of the exporting objects.

It can generates the INMEMORY clause that matches the table settings at export time.

NO.36 Which two options are part of a Soft Parse operation?

SQL Row Source Generation

SQL Optimization

Semantic Check

Shared Pool Memory Allocation

Syntax Check

NO.37 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.

NO.38 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.

NO.39 Examine this command:

What is the maximum number of baselines generated by this command that you can have at any given time?

NO.40 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.

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1Z0-084 100% Pass Guaranteed Download Oracle Database 19c Exam PDF Q&A [Q19-Q40]

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