2025年更新のOracle Database 19cが有効な1Z0-084問題集を無料提供しています [Q11-Q26]

Rate this post

2025年更新のOracle Database 19cが有効な1Z0-084問題集を無料提供しています

最新のGoShiken 1Z0-084のPDF問題集をダウンロードしちゃおう：https://www.goshiken.com/Oracle/1Z0-084-mondaishu.html（57問題と解答)

11、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

12、Examine this statement and output:

Which three statements are true?

Both 9822 and 8779 sessions are waiting for operating system resources.

Session 8779 may be waiting due to a network problem.

Session 9857 waited 1354 seconds for another process, which was also waiting for a transaction to end.

Session 9857 is not waiting.

Session 8779 may be waiting for a user or application response.

Session 9822 will always stop waiting if the session that owns the TX enqueue issues a COMMIT statement as session 9822 is the first session in the transaction queue.

13、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

14、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

15、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.

16、Examine these statements and output:

What parameter change activates the generation and use of SQL Plan Directives7

optimizer_features_enable=12.2.0.1

optimizer_capture_sql_plan_baselines_TRUE

optimizer_dynamic_sampling=11

optimizer_adaptive_plans=TRUE

optimizer_adaptive_statistics = TRUE

17、Database performance has degraded recently.
index range scan operations on index ix_sales_time_id are slower due to an increase in buffer gets on sales table blocks.
Examine these attributes displayed by querying DBA_TABLES:

Now, examine these attributes displayed by querying DBA_INDEXES:

Which action will reduce the excessive buffer gets?

Re-create the SALES table sorted in order of index IX_SALES_TIME_ID.

Re-create index IX_SALES_TIME_ID using ADVANCED COMPRESSION.

Re-create the SALES table using the columns in IX_SALES_TIME_ID as the hash partitioning key.

Partition index IX_SALES_TIME_ID using hash partitioning.

18、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.

19、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.

20、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.

21、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.

22、During which application lifecycle phase do you take baselines?

Testing

Migration or upgrade

Design and development

Deployment

Production

23、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

24、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

25、Which two statements are true about cursor sharing?

Setting Cursor_sharing to FORCE can result in a plan that is suboptimal for the majority of values bound to a bind variable when executing a cursor with one or more bind variables.

Adaptive Cursor Sharing guarantees that a suboptimal plan will never be used on any execution of a SQL statement.

Setting optimizer_capture_sql_plan_baselines to TRUE loads all adaptive plans for the same statement into the cursor cache.

Setting cursor_sharing to EXACT prevents Adaptive Cursor Sharing from being used.

Adaptive Cursor Sharing requires histograms on filtered columns, used in equality predicates, to allow different execution plans to be generated for statements whose bound values would normally generate different plans at hard parse time.

26、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.

実験された試験材料は1Z0-084：https://www.goshiken.com/Oracle/1Z0-084-mondaishu.html

Tags: 1Z0-084出題範囲, 1Z0-084学習関連題, 1Z0-084復習資料, 1Z0-084日本語的中対策, 1Z0-084最新対策問題, 1Z0-084難易度受験料

2025年更新のOracle Database 19cが有効な1Z0-084問題集を無料提供しています [Q11-Q26]

コメントを残すコメントをキャンセル

関連認証

1Z0-084 練習テスト

最近の投稿

アーカイブ

カテゴリー

2025年更新のOracle Database 19cが有効な1Z0-084問題集を無料提供しています [Q11-Q26]

コメントを残す コメントをキャンセル

関連認証

1Z0-084 練習テスト

最近の投稿

アーカイブ

カテゴリー

コメントを残すコメントをキャンセル