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SELECT t.month_id, f.store_id, p.group_id, sum(amount) as total_sales FROM sales f, product p, time t WHERE f.date_id = t.date_id AND f.product_id = p.product_id AND t.month_id = 200812 GROUP BY t.month_id, f.store_id, p.group_id\GN     )        Benefits of MQTs What is an MQT?MQT stands for Materialized Query Table. Basic Idea: Query results caching - pre-compute and store (in database tables) the results of frequently issued queries Query optimizer automatically and transparently replace portions of future queries with direct references to the pre-computed (i.e., materialized) results. This is referred to as MQT routing or matching. Standard technique in data warehousing, also known as aggregate tables and aggregate (re-)routing, or alternatively, as materialized views. )ZZ Z8ZZZZ* 8  B@Usages of MQTs  At a High Level 'Aggregate data over one or more dimensions Joins and aggregate data over a group of tables Data from a commonly accessed subset of data, that is, from a "hot" horizontal or vertical database partition Repartitioned data from a table, or part of a table, in a partitioned database environment How query can be routed to MQT?MQT_SalesByMthStrGrp SELECT t.month_id, f.store_id, p.group_id, sum(amount) as total_sales FROM sales f, product p, time t WHERE f.date_id = t.date_id AND f.product_id = p.product_id GROUP BY t.month_id, f.store_id, p.group_idF P         )        MQT Creation MQTs are created using the CREATE TABLE statement Immediately after creation, the MQT is empty and not accessible. It is populated using the REFRESH TABLE statement After running the REFRESH, the MQT becomes accessibleV2s6Z~=AgendaJMotivation Sample scenario How MQT can help Types of MQTs & Maintenance MQT Matching  what queries can benefit from MQTs Design Considerations Other Uses of MQT 6 !y !y,6<,, Types of MQTs   MQT MaintenanceProcess of synchronizing the MQT data with changes to the underlying tables Incremental Maintenance Immediate Propagate Immediate Applied (IPIA) Full Maintenance Hybrid Immediate Propagate Deferred Applied (IPDA)bM.,M., *Incremental Maintenance the ability to maintain the MQT without the need to access the modified base table, only using the delta information (newly inserted/updated/deleted data) and the MQT itself. REFRESH IMMEDIDATE MQTs are maintained incrementally during: INSERT/UPDATE/DELETE of base table processing REFRESH TABLE processing after LOAD INSERT into the base table. Immediate Propagate, Immediate Apply For performance reasons, only incrementally maintainable MQTs can be defined as REFRESH IMMEDIATE (hence more restrictions in MQT definition)lPoPPcn  o,Q 3Full MaintenanceMQTs are fully rebuilt by re-evaluating the query in the MQT definition REFRESH DEFERRED MQTs (without staging table): not maintained during INSERT/UPDATE/DELETE operations on the base table. synchronized with base table using the REFRESH TABLE statement6w@(@(w$U+.Hybrid - Immediate Propagate, Deferred ApplieddREFRESH DEFERRED MQTs with staging table Delta changes to MQT are computed upon INSERT/UPDATE/DELETE of base tables Delta aggregate is recorded in a separate staging table Subsequent REFRESH of MQT can be done incrementally Immediate Propagate, Deferred Apply One staging table per MQT CREATE TABLE SALES_BY_YEAR_STG FOR SALES_BY_YEAR PROPAGATE IMMEDIATE;l)ZZ>ZGZ)u4>GP0User Maintained MQTUser is responsible for maintaining MQT content REFRESH TABLE disallowed Insert/update/delete on MQT allowed Must be REFRESH DEFERRED Scenarios where user maintained MQTs are For efficiency reasons, when the user is convinced that (s)he can implement MQT maintenance far more efficiently than the mechanisms used by DB2. For leveraging existing  user maintained summaries, where the user wants DB2 to automatically consider them for optimization for new ad hoc queries being executed against the base tables.&PP,? 1Refresh Considerations >AgendaJMotivation Sample scenario How MQT can help Types of MQTs & Maintenance MQT Matching  what queries can benefit from MQTs Design Considerations Other Uses of MQT 6 !y !y,6<,# MQT Matching\Process to automatically use the MQT to derive results for a query for improved performance (\\5  67Query with predicates that are a subset of those in MQT8$Query with more table joins than MQT%% 9.Query with more table joins than MQT (Example)$/   :!Queries with fewer joins than MQT$" In general, we can t route queries to an MQT that has more table joins because the extra joins affects the MQT content However, if the extra joins in MQT are RI-joins, i.e. joins with RI parent table with join predicate of the form: child.fk = parent.pk They are  look-up joins that do not add or delete rows RI-join is common between Fact and Dimension tables. Need to declare RI constraints (even just informational constraints) to tell DB2 about it`8  , ;+Queries with fewer joins than MQT (Example)$,  %8Importance of NOT NULL Constraint on Foreign Key Columns99:Declaring NOT NULL constraint on the foreign key column of the child table is important! If a row of column SALES.product_id has null value: the row will not qualify the join predicate f.product_id = p.product_id. The MQT would be missing some rows that are needed by the query, hence incorrect to route. |t,--] >t=  _0Queries at higher aggregation level than an MQT 11"/Queries at a higher level aggregation - Example 'Functional Dependencies|X functionally determines Y iff each X value is associated with precisely one Y value. By definition, all columns of a relation are functionally dependent on the unique/primary key. De-normalization introduces functional dependencies between non-key columns. Between ID and descriptive columns Example: group_id ! group_desc Between different levels of the hierarchy Example: group_id ! (family_id, line_id, division_id) Z#ZZ*Z*Z#ZZ># A* ! A #AA 4  <Functional Dependencies in DB2hUser can help DB2 identifies the functional dependencies among non-key columns by declaring NOT ENFORCED FD constraints: ALTER TABLE PRODUCT ADD CHECK((group_desc) DETERMINED BY group_id) NOT ENFORCED ENABLE QUERY OPTIMIZATION During MQT routing, DB2 will re-join with the table to pick up the  dependents hykQy+ 3O,{(!Functional Dependencies - Example"" AFunctional Dependencies in MQTIt is a good practice to declare functional dependencies to keep the minimum amount of dimensional information in the MQT. This will: keep the size of the MQT small Keep the MQT unaffected by dimension table updates - minimize the need for maintenance(ww/>MQT Matching  Insurance Policy ?AgendaJMotivation Sample scenario How MQT can help Types of MQTs & Maintenance MQT Matching  what queries can benefit from MQTs Design Considerations Other Uses of MQT 6 !y !y,6<,-Design ConsiderationsOn usage of MQT Space requirement  MQTs are materialized tables On MQT definition Level of aggregation vs. query processing time Too high level  few queries can route to it Too low level  costly compensation time Workload-based vs. Model-based Numbers of MQTs 1/V/ /V/ ,$.  @Another Use of Replicated MQTsIn partitioned database, colocation of rows involved in different tables => efficient join (colocated joins) In a typical star schema setup, the fact table can be co-located with at most one dimension table. The remaining (smaller) dimension tables are frequently replicated to all nodes of the fact table Replicated MQTs are used to achieve co-location of data for efficient join processing in partitioned database environment 6\ > 9 l7SummaryAn MQT is a table that stores pre-computed query results. Queries can be matched to an MQT to improve performance. Different types of MQTs and their maintenance: immediate, deferred (with/without staging table), user maintained replicated Queries can be matched to an MQT that has: Predicates that are superset of those in queries Finer grained aggregation level More/few table joins Not null constraint, foreign key constraints and functional dependencies can be defined to help MQT matching tM+fmM+fm e4 ReferencesRedbooks (http://www.redbooks.ibm.com) DB2 UDB's High Function Business Intelligence in e-Business (SG24-6546-00) Related Papers Wolfgang Lehner, Richard Sidle, Hamid Pirahesh, Roberta Cochrane: Maintenance of Automatic Summary Tables. SIGMOD Conference 2000: 512-513 Markos Zaharioudakis, Roberta Cochrane, George Lapis, Hamid Pirahesh, Monica Urata: Answering Complex SQL Queries Using Automatic Summary Tables. SIGMOD Conference 2000: 105-116T'K='K= Z] " `0 %#E Thank You  $$F Backup Slides$!CExplain MessagesSample Explain Messages: EXP0054W The following REFRESH DEFERRED MQT was not considered for rewrite matching because the CURRENT REFRESH AGE register was not set to ANY:  PETRUS.MQT1". EXP0078W The following MQT was not used in rewrite matching because an equivalent or better candidate was available:  PETRUS.MQT1 . EXP0073W (1) The following MQT was not used in rewrite matching because one or more predicates from the query could not be matched with the MQT:  PETRUS.MQT3". EXP0079W The following MQT was not used in the final access plan, because the plan cost with this MQTs was more expensive:  PETRUS.MQT3". -  &"DGrouping Sets and Super-groupsGROUPING SETS = UNION of GROUP BY Example: GROUPING SETS ((a,b,c), (a,d,e)) = GROUP BY a,b,c UNION ALL GROUP BY a,d,e Simple GROUP BY = GROUP SETS with single element Example: GROUP BY a,b,c = GROUP BY GROUPING SETS ((a,b,c)) ROLLUP (a,b,c) = GROUPING SETS ((a,b,c), (a,b), (a), ()) CUBE  cross tabulation CUBE (a,b,c) = GROUPING SETS ((a,b,c), (a,b), (b,c), (a,c), (a), (b), (c), ())"+*1;QO"+*1 ; QO;D */`op qrs t  ` xx-т` xfxт>?" dZ@~?dd@%4 ! ?@ n?" dd@   @@``PJZ @ ` `pF%@`F% @ `   d\P$  (     Z?g ?"6?@`NNN?N  A 6x ? ?ibm_light_gray_logo_300dpi"6?@`NNN?N?"  <g c"$`?P  C A"}&  Hh? ?"6?@`NNN?Na7)  X Click to edit Master title style!!  4  6 #" `_?  RClick to edit Master text styles Second level Third level Fourth level Fifth level!    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J+D=' = @B +}  . $(   r   S Ht*)   r   S u 3   H   0޽h ? xx-т___PPT10i.SЫ}+D=' = @B +   5 - P3T (  T T 6 Pb W'Database Schema for Our Sample Scenario(("" T 6`"`gN s  \Product_id Store_id Date_id Amount Quantity & 6 " T 0"`N s  5SALESLB T c $D h "  T 6Б"`S j*Store_id Region_id & $ "  T 0 "` 5STORELB  T c $D"  T 6"` y $Date_id Month_id Quarter_id Year_idH "  T 0"`/ y 4TIMELB T c $D  v" T 6"`%1  zProduct_id Class_id Group_id Family_id Line_id Division_id & l   " T 04"`1  7PRODUCTLB T c $Dww^B T 6D1 ^B T@ 6D1y = ^B T 6D1  T N 1?"6@ NNN?N  K Star Schema$ 8Z2 H T 0޽h ? xx-т___PPT10i.1+D=' = @B +  p3'+\(  \ \  0    `" \ s *"`  `" \ s *"` `" \ s *"`A " \ <"` oI  7Store"  \ <"`   7Month"  \ <ؾ"` KX  9Product"  \ <l"` K  7Class"  \ <$"`qK;  7Group"  \ <"`K 8Family" \ <B"`JK 6Line" \ <"`K :Division  " \ <d"`q ;  9Quarter" \ <P"`  6Year" \ <"` o  8RegionXB \ 0Do // XB \ 0DoB // XB \ 0Do//pXB \ 0Do//XB \ 0Do//IXB \ 0Do o XB \ 0Do1 XB \ 0Do  " \ <& < Sales Fact  L \ c $I  L \ c $. I L \ c $X   \ <$d $ AProduct Dimension !\ < * f >Time Dimension "\ <lyC9  ?Store Dimension $\ <t 7Level 5 %\ <0   7Level 1 &\ <q1  7Level 2 '\ <, 7Level 3 (\ <$T 7Level 4 )\ <D$ g  7Level 0" *\ <p$"`d  .  5DayXB +\ 0Do H \ 0޽h ??`\\\\*\\\ \\ KkKkF___PPT10i.DbZ+D=' = @B +}  3x$(  xr x S ,A$a7)  $ r x S B$_?6 $ H x 0޽h ? xx-т___PPT10i.7D+D=' = @B +U> p 663PxpP13(  p~ p s *Z$a7  $  8 N +  wpb + T Ng  p# N + hR p s *"`Ng 8 p  BMCDE0FrLLpXm5J7 )j:6XjZ<&)nTVUZ[ibY(A ~#KXi!zE!/Ie}2MEwn[JB,!'KCOf@yyp68@                         `- # p 0"`w [I 8Fact(2 p 0"`'   6GB(2 p 0^$"`G   8JOIN(2  p 0Pa$"`a '  8Dim2(2  p 0d$"` I 8Dim1(2  p 0g$"`a e'  8JOIN(2N  p S i' ss N  p S s'  N p S s a N p S  a N p S  G  Np Bm$t Q9 Yp Tm$ 1?"6@ NNN?N\ P Month=200812( 8Z2  l g  xpg ,$D0T Ng   p# W hR !p s *"`Ng 8 "p  BMCDE0FrLLpXm5J7 )j:6XjZ<&)nTVUZ[ibY(A ~#KXi!zE!/Ie}2MEwn[JB,!'KCOf@yyp68@                         `- # #p 00t$"`w [I 8Fact(2 $p 0w$"`'   6GB(2 %p 0\{$"`G   8JOIN(2 &p 0$"`a '  8Dim2(2 'p 0x$"` I 8Dim1(2 (p 0d$"`a e'  8JOIN(2N )p S i' ss N *p S s'  N +p S s a N ,p S  a N -p S  G  p Bl$  *Bob s Query [p TȰ$ 1?"6@ NNN?N Z  N Store=McLean& 8Z2 Jl   vp ,$D0nR p 0"`E$etR ?p 6|"`  @p 60$"` 8Fact(2 Ap 6H$"` p  6GB(2 Bp 6$"`   8JOIN(2 Cp 64$"`   8Dim2(2 Dp 6 $"` 8Dim1(2 Ep 6l$"`   8JOIN(2T Fp c $  T Gp c $ T Hp c $  T Ip c $  T Jp c $p   Kp B\$ j MQTl Lp <|? l Mp <|%  Op B$ Q9l Pp <|5e nR Qp 0"` ?nR Rp 0"`g Tp B$x "Bob s Q Vp B4$L "Joe s Qn Xp 0"` I `p T$ 1?"6@ NNN?Nmi  RCompute Once & Reuse"8Z2 bp N$ 1?"6@ NNN?N) P Month=200812( 8Z2   tp N$ 1?"6@ NNN?N@q N Store=McLean& 8Z2  up Nx$ 1?"6@ NNN?N f< UGroup=Laser Printer&8Z2H p 0޽h ?pppppppppppppp(p)p'p(p*p(p%p+p &p%p,p %p$p-pEpFpDpEpGpEpBpHpCpBpIpBpApJp?pQpLp?pRpMp p p p p p ppp pppppp?ppPp KkKkFXP___PPT100.}+EU4 D' = @B D' = @BA?%,( < +O%,( < +D' =%(D' =%(DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<*xp%(D' =-6B'blinds(horizontal)*<3<*xpD' =%(D' =%(DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<*vp%(D' =-6B'blinds(horizontal)*<3<*vp+  3lZ(  l~ l s *La7)    l s *%b   * @`H l 0޽h ? KkKkF___PPT10i.E0++D=' = @B +}   7L$(  Lr L S ?a7)   r L S l/+   H L 0޽h ? xx-т___PPT10i.kp+D=' = @B +   ~ 4  (  "  T1?"6@`NNN?Nvd "   Z1?"6@`NNN?NMPz"   T1?"6@`NNN?N, D ,$@0r  S FnZ0   r  S G     6DI "`b }Q9: Original Query SELECT t.month_id, f.store_id, p.group_id, sum(amount) as total_sales FROM sales f, product p, time t WHERE f.date_id = t.date_id AND f.product_id = p.product_id AND t.month_id = 200812 GROUP BY t.month_id, f.store_id, p.group_idLZ   ,       )        9  6xW "` X,$0 Q9: Rewritten Query SELECT m.month_id, m.store_id, m.group_id, m.total_sales FROM MQT_SalesByMthStrGrp m WHERE m.month_id = 200812 ^Z T     t        N1?"6@ NNN?N E ,$@0@   N` 1?"6@ NNN?NX  ,$0 PRoute Query to MQT"8Z2H  0޽h ? xx-т  ___PPT10 .7`7+"D ' = @B D ' = @BA?%,( < +O%,( < +D ' =%(D ' =%(DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<* %(D' =-6B'blinds(horizontal)*<3<* DT' =A@BBB B0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =-6B'blinds(horizontal)*<3<*DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =-6B'blinds(horizontal)*<3<*DT' =A@BBB B0B%(D' =1:Bvisible*o3>+B#style.visibility<* %(D' =-6B'blinds(horizontal)*<3<* +p+0+ ++0+  +Q   h ` 3t(  t~ t s *Ȁa7    t s *Ui   * @` t 6@="`FB  "CREATE TABLE MQT_SalesByMthStrGrp AS (SELECT t.month_id, f.store_id, p.group_id, sum(amount) as total_sales FROM sales f, product p, time t WHERE f.date_id = t.date_id AND f.product_id = p.product_id GROUP BY t.month_id, f.store_id, p.group_id) DATA INITIALLY DEFERRED REFRESH DEFERRED; REFRESH TABLE MQT_SalesByMthStrGrp; RUNSTATS ON TABLE petrus.MQT_SalesByMthStrGrp WITH DISTRIBUTION AND DETAILED INDEXES ALL; -- Confirm that MQT is being used by -- (a) setting CURRENT REFRESH AGE to ANY -- (b) explaining the query used as -- the MQT s definition2% 2Z: GGGC C C!GCC GCCb C  G @ C (      )       ; H t 0޽h ? KkKkF___PPT10i.0^+D=' = @B +E  \T68(  8x 8 c $*)   x 8 c $ 3    8 N1?"6@`NNN?NV4H 8 0޽h ? xx-т___PPT10i.SЫ}+D=' = @B +| q   5[ (  r  S Xa7)     N̴ 1?"6@ NNN?NQ ' AMQT"8Z2   N 1?"6@ NNN?NC  OSystem Maintained"8Z2   NX 1?"6@ NNN?N)P s MUser Maintained"8Z2   NpT 1?"6@ NNN?N   ORefresh IMMEDIATE"8Z2   Nt 1?"6@ NNN?N  y  NRefresh DEFERRED"8Z2    N 1?"6@ NNN?N    PWITH staging table"8Z2   N 1?"6@ NNN?N  `  SWITHOUT staging table"8Z2   H1?"0@NNN?N'Sg C  N1?"0@NNN?N'g b) @ N1?"0@NNN?NS   N1?"0@NNN?NS    H1?"0@NNN?Ny   @ N1?"0@NNN?Ny  H  0޽h ?o     xx-т___PPT10i.ÕNz+D=' = @B +  @4T(  ~  s *a7)     c $wV'   * @`H  0޽h ? KkKkF___PPT10i.G+D=' = @B +t  ss4  ks(  r  S a7)   B  TD?"   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