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Oracle 1Z0-084 exam is intended for individuals who have experience with Oracle Database 19c and are familiar with the basic concepts of database management. Candidates should have a strong understanding of SQL, database architecture, and performance tuning techniques. It is recommended that candidates have at least 2 years of experience working with Oracle Database 19c before taking the exam.

NO.12 Multiple sessions are inserting data concurrently into a table that has an LOB column.
At some point in time, one of the sessions cannot find available space in the LOB segment and needs to allocate a new extent.
Which wait event will be raised in the other sessions that need space in the LOB column?

enq: SQ – contention

enq: TM – contention

enq: HW – contention

enq: TX – allocate ITL entry

NO.13 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.14 Which application lifecycle phase could be managed reactively?

Design and development

Upgrade or migration

Testing

Production

Deployment

NO.15 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.16 Which three statements are true about server-generated alerts?

They are notifications from the Oracle Database Server of an existing or impending problem.

They provide notifications but never any suggestions for correcting the identified problems.

They are logged in the alert log.

They can be viewed only from the Cloud Control Database home page.

Their threshold settings can be modified by using DBMS_SERVER_ALERT.

They may contain suggestions for correcting the identified problems.

Server-generated alerts in Oracle Database are designed to notify DBAs and other administrators about issues within the database environment. These alerts can be triggered by a variety of conditions, including threshold-based metrics and specific events such as ORA- error messages. Here’s how these options align with the statements provided:
* A (True):Server-generated alerts are indeed notifications from the Oracle Database Server that highlight existing or impending issues. These alerts are part of Oracle’s proactive management capabilities, designed to inform administrators about potential problems before they escalate.
* C (True):These alerts are logged in the alert log of the Oracle Database. The alert log is a crucial diagnostic tool that records major events and changes in the database, including server-generated alerts.
This log is often the first place DBAs look when troubleshooting database issues.
* F (True):Server-generated alerts may include suggestions for correcting identified problems. Oracle Database often provides actionable advice within these alerts to assist in resolving issues more efficiently. These suggestions can range from adjusting configuration parameters to performing specific maintenance tasks.
Options B, D, and E do not accurately describe server-generated alerts:
* B (False):While the statement might have been true in some contexts, Oracle’s server-generated alerts often include corrective suggestions, making this statement incorrect.
* D (False):Server-generated alerts can be viewed from various interfaces, not just the Cloud Control Database home page. They are accessible through Enterprise Manager, SQL Developer, and directly within the database alert log, among other tools.
* E (False):While it’s true that threshold settings for some alerts can be modified, the method specified, usingDBMS_SERVER_ALERT, is not correct. Threshold settings are typically adjusted through Enterprise Manager or by modifying specific initialization parameters directly.
References:
* Oracle Database Documentation:Oracle Database 19c: Performance Management and Tuning
* Oracle Base: Alert Log and Trace Files
* Oracle Support:Understanding and Managing Server-Generated Alerts

NO.17 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.18 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

NO.19 You are informed that the RMAN session that is performing the database duplication is much slower than usual. You want to know the approximate time when the rman operation will be completed.
Which view has this information?

V$SESSION

V$SESSTAT

V$RMAN_BACKUP_JOB_DETAILS

V$SESSION_LONGOPS

NO.20 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.21 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.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 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.24 Accessing the SALES tables causes excessive db file sequential read wait events.
Examine this AWR except:

Now, examine these attributes displayed by querying dba_tables:

Finally, examine these parameter settings:

Which two must both be used to reduce these excessive waits?

Partition the SALES table.

Increase PCTFREE for the SALES table.

Re-create the SALES table.

Compress the SALES table.

Coalesce all sales table indexes.

NO.25 During which application lifecycle phase do you take baselines?

Testing

Migration or upgrade

Design and development

Deployment

Production

NO.26 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.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

NO.28 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

NO.29 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.30 Examine this AWR report 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

Oracle 1Z0-084 exam covers a range of topics related to performance and tuning management, including database architecture, memory management, SQL tuning, database monitoring, and performance diagnostics. 1Z0-084 exam is composed of 70 multiple-choice questions that must be completed within 105 minutes. The passing score for 1Z0-084 exam is 63%, and the exam fee is $245 USD. Successfully passing 1Z0-084 exam provides a valuable credential that demonstrates your proficiency in Oracle database performance and tuning management, which can open up new career opportunities and increase your earning potential.

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