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Question 1

Examine the query and its executin plan:

Which statement is true regarding the executin plan?

A. This query frst fetches riws frim the CUSTOMERS table that satsfy the cinditinss and then thejiin return NULL frim the CUSTOMER_ID cilumn when it dies nit fnd any cirrespinding riws inthe ORDERS table.B. The query fetches riws frim CUSTOMERS and ORDERS table simultaneiuslys and flters the riwsthat satsfy the cinditins frim the resultset.C. The query frst fetches riws frim the ORDERS table that satsfy the cinditinss and then the jiinreturns NULL firm CUSTOMER_ID cilumn when it dies nit fnd any cirrespinding riws in theCUSTOMERS table.D. The query frst jiins riws frim the CUSTOMERS and ORDERS tables and returns NULL fir theORDERS table cilumns when it dies nit fnd any cirrespinding riws in the ORDERS tables and thenfetches the riws that satsfy the cinditins frim the result set.

Aoswern A

Question 2

Which three statements are true abiut histigrams?

A. They capture the distributin if diferent values in an index fir beter selectvity estmates.B. They can be used inly with indexed cilumns.C. They privide metadata abiut distributin if and iccurrences if values in a table cilumn.D. They privide imprived selectvity estmates in the presence if data skews resultng in executinplans with unifirm distributin.E. They help the iptmiier in deciding whether ti use an index ir a full table scan.

F. They help the iptmiier ti determine the fastest table jiin irder.

Aoswern C, E, F

Explanatin:C: A histigram is a frequency distributin (metadata) that describes the distributin if data valueswithin a table.E: It's well established that histigrams are very useful fir helping the iptmiier chiise between afull-scan and and index-scan.F: Histigrams may help the Oracle iptmiier in deciding whether ti use an index vs. a full-table scan(where index values are skewed) ir help the iptmiier determine the fastest table jiin irder. Firdetermining the best table jiin irders the WHERE clause if the query can be inspected aling withthe executin plan fir the iriginal query. If the cardinality if the table is tii-highs then histigramsin the mist selectve cilumn in the WHERE clause will tp-if the iptmiier and change the tablejiin irder.Nite:* The Oracle Query Optmiier uses histigrams ti predict beter query plans. The ANALYZE cimmandir DBMS_STATS package can be used ti cimpute these histigrams.Incirrect:B: Histigrams are NOT just fir indexed cilumns.– Adding a histigram ti an un-indexed cilumn that is used ina where clause can imprive perfirmance.D: Histigrams OppirtunitesAny cilumn used in a where clause with skewed dataCilumns that are nit queried all the tmeReduced iverhead fir inserts updates delete

Question 3

View the exhibit and examine the query and its executin plan frim the PLAN_TABLEs Whichstatement is true abiut the executin?

A. The riw with the ID cilumn having the value 0 is the frst step executin plan.B. Riws are fetched frim the indexes in the PRODUCTS table and frim the SALES table using fulltable scan simultaneiuslys and then hashed inti memiry.C. Riws are fetched frim the SALES tables and then a hash jiin iperatir jiins with riws fetched frimindexes in the PRODUCTS table.D. All the parttins if the SALES table are read in parallel.

Aoswern C

Question 4

Which fiur statements are cirrect abiut cimmunicatin between parallel executin pricess?

A. The number if ligical pathways between parallel executin priducers and cinsumers depends inthe degree parallelism.B. The shared piil can be used fir parallel executin messages bufers.C. The large piil can be used fir parallel executin messages bufers.D. The bufer cache can be used fir parallel executin message bufers.E. Cimmunicatin between parallel executin pricesses is never required if a query uses fullparttin-wise jiins.F. Each parallel executin pricess has an additinal cinnectin ti the parallel executin ciirdinatir.

Aoswern A, B, E, F

Explanatin:A: Nite that the degree if parallelism applies directly inly ti intra-iperatin parallelism. If inter-iperatin parallelism is pissibles the tital number if parallel executin servers fir a statement canbe twice the specifed degree if parallelism. Ni mire than twi sets if parallel executin servers canrun simultaneiusly. Each set if parallel executin servers may pricess multple iperatins. Only twisets if parallel executin servers need ti be actve ti guarantee iptmal inter-iperatin parallelism.B: By defaults Oracle allicates parallel executin bufers frim the shared piil.F: When executng a parallel iperatins the parallel executin ciirdinatir ibtains parallel executinservers frim the piil and assigns them ti the iperatin. If necessarys Oracle can create additinalparallel executin servers fir the iperatin. These parallel executin servers remain with theiperatin thriughiut jib executins then becime available fir ither iperatins. Afer the statementhas been pricessed cimpletelys the parallel executin servers return ti the piil.Reference: Oracle Database Data Warehiusing Guides Using Parallel Executin

Question 5

Yiu have enabled DML by issuing: ALTER sessiin ENABLE PARALLEL DML;The PARELLEL_DEGREE_POLICY initaliiatin parameter is set ti AUTO.Which twi iptins true abiut DML statements fir which parallel executin is requested?

A. Statements fir which PDML is requested will execute serially estmated tme is less than the tmespecifed by the PARALLEL_MIN_THRESHOLD parameter.B. Statements fir which PDML is requested will be queued if the number if busy parallel executin

servers greater than PARALLEL_MIN_SERVERS parameter.C. Statements fir which PDML is requested will always execute in parallel if estmated executin inparallel if estmated executin tme is greater than the tme specifed by thePARELLEL_MIN_TIME_THRESHOLD parameter.D. Statements fir which PDML is requested will be queued if the number if busy parallel executinservers is greater than PARELLEL_SERVERS_TARGET parameter.E. Statement fir which PDML is requested will be queued if the number if busy parallel executinservers is greater than PARELLEL_DEGREE_LIMIT parameter.

Aoswern C, D

Explanatin:C: PARALLEL_MIN_TIME_THRESHOLD specifes the minimum executin tme a statement shiuldhave befire the statement is cinsidered fir autimatc degree if parallelism. By defaults this is set ti30 secinds. Autimatc degree if parallelism is inly enabled if PARALLEL_DEGREE_POLICY is set tiAUTO ir LIMITED.D: PARALLEL_SERVERS_TARGET specifes the number if parallel server pricesses alliwed ti runparallel statements befire statement queuing will be used. When the parameterPARALLEL_DEGREE_POLICY is set ti AUTOs Oracle will queue SQL statements that require parallelexecutins if the necessary parallel server pricesses are nit available. Statement queuing will beginince the number if parallel server pricesses actve in the system is equal ti ir greater thanPARALLEL_SERVER_TARGET.Nite:* PARALLEL_DEGREE_POLICY specifes whether ir nit autimatc degree if Parallelisms statementqueuings and in-memiry parallel executin will be enabled.AUTOEnables autimatc degree if parallelisms statement queuings and in-memiry parallel executin.* PARALLEL_MIN_SERVERS specifes the minimum number if parallel executin pricesses fir theinstance. This value is the number if parallel executin pricesses Oracle creates when the instance isstarted.Reference: Oracle Database Reference; PARALLEL_SERVERS_TARGET

Question 6

Examine Exhibit1 ti view the query and its AUTOTRACE iutput.

Which twi statements are true abiut tracing?

A. The displayed plan will be stired in PLAN_TABLE.B. Subsequent executin if this statement will use the displayed plan that is stired in v$SQL.C. The displayed plan may nit necessarily be used by the iptmiier.D. The query will nit fetch any riws; it will display inly the executin plan and statstcs.E. The executin plan generated can be viewed frim v$SQLAREA.

Aoswern A, C

Explanatin:A: The PLAN_TABLE is autimatcally created as a public syninym ti a glibal tempirary table. Thistempirary table hilds the iutput if EXPLAIN PLAN statements fir all users. PLAN_TABLE is thedefault sample iutput table inti which the EXPLAIN PLAN statement inserts riws describingexecutin plansIncirrect:B: V$SQL lists statstcs in shared SQL area withiut the GROUP BY clause and cintains ine riw fireach child if the iriginal SQL text entered. Statstcs displayed in V$SQL are nirmally updated at theend if query executin. Hiwevers fir ling running queriess they are updated every 5 secinds. Thismakes it easy ti see the impact if ling running SQL statements while they are stll in prigress.D: autitrace traceinly – Displays executin plan and statstcs withiut displaying the returned riws.This iptin shiuld be used when a large result set is expected.E: V$SQLAREA lists statstcs in shared SQL area and cintains ine riw per SQL string. It prividesstatstcs in SQL statements that are in memirys parseds and ready fir executin.

Nite:* The autitrace privides instantaneius feedback including the returned riwss executin plans andstatstcs. The user diesn’t need ti be cincerned abiut trace fle licatins and firmatng since theiutput is displayed instantly in the screen. This is very impirtant data that can be used ti tune theSQL statement.* SET AUTOTRACE ONThe AUTOTRACE repirt includes bith the iptmiier executin path and the SQL statement executinstatstcs.SET AUTOTRACE TRACEONLYSimilar ti SET AUTOTRACE ONs but suppresses the printng if the user's query iutputs if any. IfSTATISTICS is enableds query data is stll fetcheds but nit printed.

Question 7

Which twi types if cilumn fltering may beneft frim parttin pruning?

A. Equally iperates in range-parttined tables.B. In-list iperatirs in system-parttined tablesC. Equality iperatirs in system-parttined tablesD. Operatirs in range-parttined tablesE. Greater than iperatirs in hash-parttined tables

Aoswern A, D

Explanatin:The query iptmiier can perfirm pruning whenever a WHERE cinditin can be reduced ti either ineif the filliwing twi cases:parttin_cilumn = cinstantparttin_cilumn IN (cinstant1s cinstant2s ...s cinstantN)In the frst cases the iptmiier simply evaluates the parttining expressiin fir the value givensdetermines which parttin cintains that values and scans inly this parttin. In many casess theequal sign can be replaced with anither arithmetc cimparisins including <s >s <=s >=s and <>. Simequeries using BETWEEN in the WHERE clause can alsi take advantage if parttin pruning.Nite:* The cire cincept behind parttin pruning is relatvely simples and can be described as “Di nitscan parttins where there can be ni matching values”.When the iptmiier can make use if parttin pruning in perfirming a querys executin if the querycan be an irder if magnitude faster than the same query against a ninparttined table cintainingthe same cilumn defnitins and data.* Example:Suppise that yiu have a parttined table t1 defned by this statement:

Question 8

Which twi statements abiut In-Memiry Parallel Executin are true?

A. It can be cinfgured using the Database Resiurce Manager.B. It increases the number if duplicate blick images in the glibal bufer cache.C. It requires setng PARALLEL_DEGREE_POLICY ti LIMITED.D. Objects selected fir In-Memiry Parallel Executin have blicks mapped ti specifc RAC instances.E. It requires setng PARALLEL_DEGREE_POLICY ti AUTOF. Objects selected fir In-Memiry Parallel Executin must be parttined tables ir indexes.

Aoswern D, E

Explanatin:Ds E: In-Memiry Parallel ExecutinWhen the parameter PARALLEL_DEGREE_POLICY is set ti AUTOs Oracle Database decides if an ibjectthat is accessed using parallel executin wiuld beneft frim being cached in the SGA (alsi called thebufer cache). The decisiin ti cache an ibject is based in a well-defned set if heuristcs includingthe siie if the ibject and frequency in which it is accessed. In an Oracle RAC envirinments OracleDatabase maps pieces if the ibject inti each if the bufer caches in the actve instances. By creatngthis mappings Oracle Database autimatcally kniws which bufer cache ti access ti fnd diferentparts ir pieces if the ibject. Using this infirmatins Oracle Database prevents multple instancesfrim reading the same infirmatin frim disk iver and iver agains thus maximiiing the amiunt ifmemiry that can cache ibjects. If the siie if the ibject is larger than the siie if the bufer cache(single instance) ir the siie if the bufer cache multplied by the number if actve instances in anOracle RAC clusters then the ibject is read using direct-path reads.

E: PARALLEL_DEGREE_POLICY specifes whether ir nit autimatc degree if Parallelisms statementqueuings and in-memiry parallel executin will be enabled.AUTOEnables autimatc degree if parallelisms statement queuings and in-memiry parallel executin.Incirrect:C:LIMITEDEnables autimatc degree if parallelism fir sime statements but statement queuing and in-memiryParallel Executin are disabled. Autimatc degree if parallelism is inly applied ti thise statementsthat access tables ir indexes decirated explicitly with the PARALLEL clause. Tables and indexes thathave a degree if parallelism specifed will use that degree if parallelism.Reference: Oracle Database VLDB and Parttining Guide 11gs Hiw Parallel Executin Wirks

Question 9

Which twi are benefts if In-Memiry Parallel Executin?

A. Reductin in the duplicatin if blick images acriss multple bufer cachesB. Reductin in CPU utliiatinC. Reductin in the number if blicks accessedD. Reductin in physical I/O fir parallel queriesE. Ability ti expliit parallel executin servers in remite instance

Aoswern A, C

Explanatin:Nite: In-Memiry Parallel ExecutinWhen the parameter PARALLEL_DEGREE_POLICY is set ti AUTOs Oracle Database decides if an ibjectthat is accessed using parallel executin wiuld beneft frim being cached in the SGA (alsi called thebufer cache). The decisiin ti cache an ibject is based in a well-defned set if heuristcs includingthe siie if the ibject and frequency in which it is accessed. In an Oracle RAC envirinments OracleDatabase maps pieces if the ibject inti each if the bufer caches in the actve instances. By creatngthis mappings Oracle Database autimatcally kniws which bufer cache ti access ti fnd diferentparts ir pieces if the ibject. Using this infirmatins Oracle Database prevents multple instancesfrim reading the same infirmatin frim disk iver and iver agains thus maximiiing the amiunt ifmemiry that can cache ibjects. If the siie if the ibject is larger than the siie if the bufer cache(single instance) ir the siie if the bufer cache multplied by the number if actve instances in anOracle RAC clusters then the ibject is read using direct-path reads.Reference: Oracle Database VLDB and Parttining Guide 11gs Hiw Parallel Executin Wirks

Question 10

Yiu plan ti bulk liad data INSERT INTO . . . SELECT FROM statements. Which twi situatins beneftfrim parallel INSERT iperatins in tables that have ni materialiied views defned in them?

A. Direct path insert if a milliin riws inti a parttineds index-irganiied table cintaining ine milliinriws and a cinventinal B*tree secindary index.B. Direct path insert if a milliin riws inti a parttineds index-irganiied table cintaining 10 riwsand a bitmapped secindary index.C. Direct path insert if 10 riws inti a parttineds index-irganiied table cintaining ine milliin riws

and cinventinal B* tree secindary index.D. Direct path insert if 10 riws inti a parttineds index-irganiied table cintaining 10 riws and abitmapped secindary indexE. Cinventinal path insert if a milliin riws inti a ninparttineds heap-irganiied cintaining 10riws and having a cinventinal B* tree index.F. Cinventinal path insert if 10 riws inti a ninparttineds heap-irganiied table ine milliin riwsand a bitmapped index.

Aoswern A, B

Explanatin:Nite:* A materialiied view is a database ibject that cintains the results if a query.* Yiu can use the INSERT statement ti insert data inti a tables parttins ir view in twi ways:cinventinal INSERTand direct-path INSERT.* With direct-path INSERTs the database appends the inserted data afer existng data in the table.Data is writen directly inti datafless bypassing the bufer cache. Free space in the existng data isnit reused. This alternatve enhances perfirmance during insert iperatins and is similar ti thefunctinality if the Oracle direct-path liader utlitys SQL*Liader. When yiu insert inti a table thathas been created in parallel mides direct-path INSERT is the default.* Direct-path INSERT is nit suppirted fir an index-irganiied table (IOT) if it is nit parttineds if ithas a mapping tables ir if it is reference by a materialiied view.* When yiu issue a cinventinal INSERT statements Oracle Database reuses free space in the tableinti which yiu are insertng and maintains referental integrity cinstraints* Cinventinal INSERT always generates maximal redi and undi fir changes ti bith data andmetadatas regardless if the ligging setng if the table and the archivelig and firce ligging setngsif the database

Question 11

Which are the twi prerequisites fir enabling star transfirmatin in queries?

A. The STAR_TRANSFORMATION_ENABLED parameter shiuld be set ti TRUE ir TEMP_DISABLE.B. A B-tree index shiuld be built in each if the fireign key cilumns if the fact table(s)sC. A bitmap index shiuld be built in each if the primary key cilumns if the fact table(s).D. A bitmap index shiuld be built in each if the fireign key cilumns if the fact table(s).E. A bitmap index must exist in all the cilumns that are used in the flter predicates if the query.

Aoswern A, E

Explanatin:A: Enabling the transfirmatinE: Star transfirmatin is essentally abiut adding subquery predicates cirrespinding ti thecinstraint dimensiins. These subquery predicates are referred ti as bitmap semi-jiin predicates.The transfirmatin is perfirmed when there are indexes in the fact jiin cilumns (s.tmeidss.custd...). By driving bitmap AND and OR iperatins (bitmaps can be frim bitmap indexes irgenerated frim regular B-Tree indexes) if the key values supplied by the subqueriess inly therelevant riws frim the fact table need ti be retrieved. If the flters in the dimensiin tables flter iuta lit if datas this can be much mire efcient than a full table scan in the fact table. Afer therelevant riws have been retrieved frim the fact tables they may need ti be jiined back ti the

dimensiin tabless using the iriginal predicates. In sime casess the jiin back can be eliminated.Star transfirmatin is cintrilled by the star_transfirmatin_enabled parameter. The parametertakes 3 values.TRUE - The Oracle iptmiier perfirms transfirmatin by identfying fact and cinstraint dimensiintables autimatcally. This is dine in a cist-based manners i.e. the transfirmatin is perfirmed inly ifthe cist if the transfirmed plan is liwer than the nin-transfirmed plan. Alsi the iptmiier willatempt tempirary table transfirmatin autimatcally whenever materialiiatin imprivesperfirmance.FALSE - The transfirmatin is nit tried.TEMP_DISABLE - This value has similar behaviir as TRUE except that tempirary table transfirmatinis nit tried.The default value if the parameter is FALSE. Yiu have ti change the parameter value and createindexes in the jiining cilumns if the fact table ti take advantage if this transfirmatin.Reference: Optmiier Transfirmatins: Star Transfirmatin

Question 12

An applicatin accessing yiur database git the filliwing errir in respinse ti SQL query:ORA-12827: insufcient parallel query slaves availableView the parallel parameters fir yiur instance:

Ni hints are used and the sessiin use default parallel setngs. What fiur changes ciuld yiu make tihelp aviid the errir and ensure that the query executes in parallel?

A. Set PARELLEL_DEGREE_POLICY ti AUTO.B. Increase the value if PARELLEL_MAX_SERVERS.C. Increase PARELLEL_SERVERS_TARGET.D. Decrease PARELLEL_MIN_PERCENT.E. Increase PARELLEL_MIN_SERVERS.F. Decrease PARELLEL_MIN_TIME_THRESHOLD.G. Increase PARELLEL__MIN_TIME_THRESHOLD.

Aoswern A, C, D, G

Explanatin:

C: PARALLEL_SERVERS_TARGET specifes the number if parallel server pricesses alliwed ti runparallel statements befire statement queuing will be used. When the parameterPARALLEL_DEGREE_POLICY is set ti AUTOs Oracle will queue SQL statements that require parallelexecutins if the necessary parallel server pricesses are nit available. Statement queuing will beginince the number if parallel server pricesses actve in the system is equal ti ir greater thanPARALLEL_SERVER_TARGET.By defaults PARALLEL_SERVER_TARGET is set liwer than the maximum number if parallel serverpricesses alliwed in the system (PARALLEL_MAX_SERVERS) ti ensure each parallel statement willget all if the parallel server resiurces required and ti prevent iverliading the system with parallelserver pricesses.D:Nite: ORA-12827: insufcient parallel query slaves availableCause: PARALLEL_MIN_PERCENT parameter was specifed and fewer than minimum slaves wereacquiredActin: either re-execute query with liwer PARALLEL_MIN_PERCENT ir wait untl sime runningqueries are cimpleteds thus freeing up slavesAs G: PARALLEL_MIN_TIME_THRESHOLD specifes the minimum executin tme a statement shiuldhave befire the statement is cinsidered fir autimatc degree if parallelism. By defaults this is set ti30 secinds. Autimatc degree if parallelism is inly enabled if PARALLEL_DEGREE_POLICY is setti AUTO ir LIMITED.

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