visual explain lpublic.dhe.ibm.com/.../vr9/pdf/letter/nlv/zh_cn/db2tvc90.pdf · 2006-11-13 · 5d...

DB2®

Visual Explain LL

DB2 f> 9JCZ Linux M Windows

S151-0455-00

��

Z9C>JO0d'VDz7.0,kqXDA:yw;PD;cE"#

f>yw

>D5|, IBM D({E"#|Gy]mI-ia)D,"\f((#$#>vfo|,DE";|(NNz7#$,

R>Vaa)DNNyw;&wgKbM#

ITCZ_==r(}z1XD IBM zm): IBM vfo#

v * T Z _ = = ) : v f o , I C J I B M v f o P D ( I B M P u b l i c a t i o n s C e n t e r ) , x 7 *

www.ibm.com/shop/publications/order#

v *iRz1XD IBM zm,ICJ IBM +r*5K?<(IBM Directory of Worldwide Contacts),x7*

www.ibm.com/planetwide#

Z@zrSCs,*S0DB2 P!*zMz[PD1): DB2 vfo,kBg 1-800-IBM-4YOU(426-4968)#

1z"ME"x IBM s,4Zh IBM G(P(,IBM TZzya)DNNE",P({TNN|O*J1D==9C

rV",x;XTz:NNpN#

© Copyright International Business Machines Corporation 2002, 2006. All rights reserved.

http://www.ibm.com/shop/publications/order

http://www.ibm.com/planetwide

?<

XZ>LL . . . . . . . . . . . . . . 1

Z 1 N. 4(5wlU . . . . . . . . . 34(5wm . . . . . . . . . . . . . . . 39C5wlU . . . . . . . . . . . . . . 34(/, SQL r XQuery odD5wlU . . . . 54(2, SQL r XQuery odD5wlU . . . . 5

Z 2 N. T>M9CCJ=8< . . . . . 7(}SH05wD SQL r XQuery odPmPxP!

q4T>CJ=8< . . . . . . . . . . . . 7A!CJ=8<PD{E . . . . . . . . . . 79CuE,i4Es<Dwv?V . . . . . . . 8q!XZ<PTsD|`j8E" . . . . . . . 9|D<Db[ . . . . . . . . . . . . . . 10

Z 3 N. Z%;Vx}]b73PDxC

J=8 . . . . . . . . . . . . . . . 11k%;Vx}]b73PD5wlU`X*Di/ . . 11Z%;Vx}]b73PKPi/(;xw}M3F

E") . . . . . . . . . . . . . . . . 12Z%;Vx}]b73P9C runstats 4U/mMw

}D103FE" . . . . . . . . . . . . 15Z%;Vx}]b73PTCZ,Si/PDmDP

4(w} . . . . . . . . . . . . . . . 19Z%;Vx}]b73PTmP4(d{w} . . . 24

Z 4 N. ZVx}]b73PDxCJ=

8 . . . . . . . . . . . . . . . . . 29kVx}]b73PD5wlU`X*Di/ . . . 29ZVx}]b73PKPi/(;xw}M3FE

") . . . . . . . . . . . . . . . . . 30ZVx}]b73P9C runstats 4U/mMw}D

103FE" . . . . . . . . . . . . . . 32ZVx}]b73PTCZ,Si/PDmDP4(

w} . . . . . . . . . . . . . . . . . 36ZVx}]b73PTmP4(d{w} . . . . . 40

=< A. Visual Explain En . . . . . 45CJ=8 . . . . . . . . . . . . . . . 45CJ=8< . . . . . . . . . . . . . . 46CJ=8<Zc . . . . . . . . . . . . . 47/: . . . . . . . . . . . . . . . . . 47]w . . . . . . . . . . . . . . . . . 47I> . . . . . . . . . . . . . . . . . 47NjVi . . . . . . . . . . . . . . . 48}]b\mDmUd . . . . . . . . . . . 48/, SQL r XQuery . . . . . . . . . . . 495wlU . . . . . . . . . . . . . . . 49I5wod . . . . . . . . . . . . . . 50

5wod . . . . . . . . . . . . . . . 50Yw} . . . . . . . . . . . . . . . . 50Kc{ . . . . . . . . . . . . . . . . 50E/w . . . . . . . . . . . . . . . . 52Lr| . . . . . . . . . . . . . . . . 52=J . . . . . . . . . . . . . . . . . 52i/E/` . . . . . . . . . . . . . . 53=JD!qT . . . . . . . . . . . . . . 54GM,S . . . . . . . . . . . . . . . 542, SQL r XQuery . . . . . . . . . . . 5553\mDmUd . . . . . . . . . . . . 55mUd . . . . . . . . . . . . . . . . 55Timeron . . . . . . . . . . . . . . . . 56Visual Explain. . . . . . . . . . . . . . 56

=< B. 4V83rEPD VisualExplain Kc{DPm . . . . . . . . 59CMPEXP Kc{ . . . . . . . . . . . . . 59DELETE Kc{ . . . . . . . . . . . . . 60EISCAN Kc{ . . . . . . . . . . . . . 60FETCH Kc{ . . . . . . . . . . . . . 60FILTER Kc{ . . . . . . . . . . . . . 61GENROW Kc{ . . . . . . . . . . . . 61GRPBY Kc{ . . . . . . . . . . . . . 61HSJOIN Kc{ . . . . . . . . . . . . . 62INSERT Kc{ . . . . . . . . . . . . . 62IXAND Kc{ . . . . . . . . . . . . . 62IXSCAN Kc{ . . . . . . . . . . . . . 63MSJOIN Kc{ . . . . . . . . . . . . . 64NLJOIN Kc{ . . . . . . . . . . . . . 64PIPE Kc{ . . . . . . . . . . . . . . 65RETURN Kc{ . . . . . . . . . . . . . 65RIDSCN Kc{ . . . . . . . . . . . . . 65RPD Kc{ . . . . . . . . . . . . . . 65SHIP Kc{ . . . . . . . . . . . . . . 66SORT Kc{ . . . . . . . . . . . . . . 66TBSCAN Kc{ . . . . . . . . . . . . . 67TEMP Kc{ . . . . . . . . . . . . . . 67TQUEUE Kc{ . . . . . . . . . . . . . 67UNION Kc{ . . . . . . . . . . . . . 68UNIQUE Kc{ . . . . . . . . . . . . . 68UPDATE Kc{ . . . . . . . . . . . . . 68XISCAN Kc{ . . . . . . . . . . . . . 69XSCAN Kc{ . . . . . . . . . . . . . 70XANDOR Kc{ . . . . . . . . . . . . 71

=< C. DB2 En . . . . . . . . . . 73}]b . . . . . . . . . . . . . . . . 73#= . . . . . . . . . . . . . . . . . 73m . . . . . . . . . . . . . . . . . 73

© Copyright IBM Corp. 2002, 2006 iii

=< D. d{E" . . . . . . . . . . 754(w}D<r . . . . . . . . . . . . . 75}1DCJ=8 . . . . . . . . . . . . . 759C RUNSTATS . . . . . . . . . . . . 76

=< E. yw . . . . . . . . . . . . 77Lj . . . . . . . . . . . . . . . . . 78

w} . . . . . . . . . . . . . . . . 81

k IBM *5 . . . . . . . . . . . . 83

iv Visual Explain LL

XZ>LL

>LLa)KXZ DB2® Visual Explain D&\?~D8<#(}jI>LLPDNL,

z+KbgN(}9C Visual Explain 4+ SQL r XQuery 5wodDCJ=8w*

;v<4i4#z9+'a9C<PDE"4w{i/,TqC|CDT\#

DB2 I(}9C|DE/w4lizDi/,"7(CJ}]DnQ=(#bVCJ}

]D>6;F*CJ=8#DB2 Jmzi4|!qC44PX(i/DCJ=8,Sx

9z\;KbE/w4PKD)Yw#IT9C Visual Explain +CJ=8T<DN=

T>v4#<Gi/Pf0=D}]bTs(}g,mMw})DIS/m>#|9

|(TG)Ts4PDYw(}g,(hMEr)"T>}]w#

IT(}4PBPNNryPw{n/4a_i/T}]DCJYH:

1. w{mhFMXim}]#

2. 4(J1Dw}#

3. 9C runstats |n4*E/wa)10D3FE"#

4. !qJ1DdCN}#

5. !qJ1Ds(!n#

6. hFi/TvlwXhD}]#

7. 9CCJ=8#

8. 4(5wlU#

9. 9CCJ=8<4DxCJ=8#

b)kT\`XDn/T&ZTB<}PT>DG)n/#(i_8> Visual Explain y

h*DYw#)

>LL|,PXBPYwDNL:

v 4(5wlU#5wlUTZT>CJ=8<GXhD#

v T>M&mCJ=8<#

© Copyright IBM Corp. 2002, 2006 1

v 4Pw{n/"lib)n/GgNDxCJ=8D#

":T\w{;.VI=vNL,;vNLkT%;Vx}]b73,m;vNL

kTVx}]b73#

z+9C DB2 a)Dy>}]b4p=jIb)NL#g{P44(y>}]b,k

ND db2sampl - Create sample database command#

X(Z73DE":

jPK<jDE";k%;Vx}]b73PX#

jPK<jDE";kVx}]b73PX#

2 Visual Explain LL

Z 1 N. 4(5wlU

Z>NLP,z+4(5wlU#5w&\C46qPXZdP`k2,r/, SQL r

XQuery odD73DE"#6q=DE"9z\Kb SQL r XQuery odDa9M

1ZD4PT\#5wlUGZ5w SQL r XQuery od1U/D9uE"#|Z

EXPLAIN_STATEMENT mPGw*~xFsTs(BLOB)4f"D,"R|,BP

E":

v CJ=8DZ?m>(,|(|DKc{T0CJDmMw}#

v E/w9CDP(u~,|(}]bTsD3FE"0?NYwD[FI>#

*KT>CJ=8<,Visual Explain h*5wlUPy|,DE"#

4(5wm

*4(5wlU,Xk7#zDC'j6BPTB5wm:

v EXPLAIN_INSTANCE

v EXPLAIN_STATEMENT

*lib)mGqfZ,k9C DB2 list tables |n#g{b)m;fZ,rXk9

CBP8>E"44(b)m:

1. g{P4t/ DB2,r&"v db2start |n#

2. Z DB2 CLP a>{&,,Sh*9CD}]b#TZ>LL,9C connect tosample |n4,SAy>}]b#

3. 9C EXPLAIN.DDL D~Pa)Dy>|nD~44(5wm#KD~;Z sqllib\misc

?<P#*KPC|nD~,&xkK?<""v db2 -tf EXPLAIN.DDL |n#

K|nD~+4(Ty,SDC'j6*0:D5wm#KC'j6XkTC}]

b_P CREATETAB X(,r__P SYSADM r DBADM (^#

":Zf> 9 P,05wodDz7G<10Z+T> SYSTOOLS #=M10Z(j

6D#=PD5wG<#zXkT SYSTOOLS 5wmPAX(,Visual Explain E

\lw SYSTOOLS G<"+|GT>Z05wodDz7G<10ZP#g{z

;PACJ(,b)G<+;aT>#

9C5wlU

>LLa)K 4 vy>lUozzKb Visual Explain#d;ZBPwZPa)KPX

4(zT:DlUDE",+z;h*4(T:DlUMIT9C>LL#

v */, SQL r XQuery od4(5wlU

v *2, SQL r XQuery od4(5wlU

CZy>lUDi/PvKUk,}n_Uk-m$J 90% DyPG-m01DU{"

?EMUk#

SELECT S.ID,S.NAME,O.DEPTNAME,SALARY+COMMFROM ORG O, STAFF SWHERE


O.DEPTNUMB = S.DEPT ANDS.JOB <> ’Mgr’ ANDS.SALARY+S.COMM > ALL( SELECT ST.SALARY*.9

FROM STAFF STWHERE ST.JOB=’Mgr’ )

ORDER BY S.NAME

Ci/V=v?V:

1. Si/(C(E(p4D?V)zzI?v-m$JD 90% iID}]P#IZS

i/I ALL ^(,yTvlwKmPnsD5#

2. wi/,SdP?EE`,"JOB ;HZ0Mgr1R$JS6p,}SSi/5XD

5D ORG M STAFF mPDyPP#

wi/|,KTB 3 v=J(HO):

1. O.DEPTNUMB = S.DEPT2. S.JOB <> ’Mgr’3. S.SALARY+S.COMM > ALL ( SELECT ST.SALARY*.9


b)=JVpm>:

1. ,S?EE`,D ORG M STAFF mD,S=J

2. STAFF mD JOB PD>X=J

3. STAFF mD SALARY M COMM PD>X=J,C=J9CSi/Da{#

*0ky>lU:


2. 7#}]bPP5wm#*K,&q-4(5wmPD8>E"#

3. ,SAh*9CD}]b#TZ>LL,z+,SAy>}]b#*,SAy>}

]b,S DB2 CLP a>{&"v connect to sample |n#

4. *<k$(eDlU,IKP DB2 |nD~ VESAMPL.DDL#

v KD~;Z sqllib\samples\ve ?<P#

v KD~;Z sqllib\samples\ve\inter ?<P#

*KPC|nD~,&xkK?<""v db2 -tf vesampl.ddl |n#

v Xk9C4(5wmyCD,;C'j64KPK|nD~#

v K|nD~;<k$(eDlU#|;a4(mr}]#+Ty>}]bPDm

M}]KPsfyhvDw{n/(}g,CREATE INDEX M runstats)#

VZ,zQITT>M9CCJ=8<#

`XEn:

v Z 52 3D:=J;

`XNq:

v Z 5 3D:4(/, SQL r XQuery odD5wlU;

v Z 5 3D:4(2, SQL r XQuery odD5wlU;

v Z 3 3D:4(5wm;

4 Visual Explain LL

4(/, SQL r XQuery odD5wlU

":>ZPa)K4(5wlUE")zN<#IZQ*za)Ky>5wlU,r

Kz;h*4PKNqMITjICLL#

4UTB=h4(/, SQL r XQuery odD5wlU:


2. 7#}]bPP5wm#*K,&q-4(5wmPD8>E"#

3. Z DB2 CLP a>{&,,Sh*9CD}]b#}g,*,Sy>}]b,&"

v connect to sample |n#

4. Z DB2 CLP a>{&,9CBPN;|n4(/, SQL r XQuery odD5w

lU:

v *4(5wlUx;4P SQL r XQuery od,&"v set current explainsnapshot=explain |n#

v *4(5wlU"4P SQL r XQuery od,&"v set current explainsnapshot=yes |n#

K|nahC5w(CDfw#;)hCKCDfw,ryPsxD SQL r XQuery

od<a\=0l#PX|`E",kND SQL Reference PXZ105wlU;

Z#

5. S DB2 CLP a>{&a; SQL r XQuery od#

6. *i4lUDCJ=8<,I"B;ZXFPDPD05wodz7G<10Z"

+wClU#

7. I!#*XUlU&\,Za; SQL r XQuery od.s"v set current explainsnapshot=no |n#

`XEn:

v Z 49 3D:5wlU;

v Z 49 3D:/, SQL r XQuery;

`XNq:

v Z 3 3D:4(5wm;

4(2, SQL r XQuery odD5wlU

":>ZPa)K4(5wlUE")zN<#IZQ*za)Ky>5wlU,r

Kz;h*4PKNqMITjICLL#

4UTB=h4(2, SQL r XQuery odD5wlU:


2. 7#}]bPP5wm#*K,&q-4(5wmPD8>E"#

3. Z DB2 CLP a>{&,,Sh*9CD}]b#}g,*,Sy>}]b,&"

v connect to sample |n#

4. (}Zs(r<8&CLr19C EXPLSNAP !n,4(2, SQL r XQuery o

dD5wlU#}g,"v bind your file explsnap yes |n#

Z 1 N. 4(5wlU 5

5. I!#*i4lUDCJ=8<,I"B;ZXFPDPD05wodz7G<1

0Z"+wClU#

PX+ EXPLSNAP !nCZH' API DE",kND Administrative API Reference

P|GwTDBZ#

B;=gNYw:

Z0Z 2 N T>M9CCJ=8<1P,z+'0gNi4CJ=8<"mbCJ=

8<DZ]#

`XEn:

v Z 49 3D:5wlU;

v Z 55 3D:2, SQL r XQuery;

`XNq:

v Z 3 3D:4(5wm;

6 Visual Explain LL

Z 2 N. T>M9CCJ=8<

Z>NLP,+9C0CJ=8<10Z4T>M9CCJ=8<#CJ=8<GC

J=8D<Nm>(#ITSC<Pi4BPwnDj8E":

v m(0d`X*DP)Mw}

v Kc{(}g,m(h"ErM,S)

v mUdM/}#

IT(}BP=(4T>CJ=8<:

v SH05wDodDPmPxP!q#

v SLr|PDI5wodDPmPxP!q#

v /,5w SQL r XQuery od#

r*+QCJ=8<CZZZ 1 NP0kDy>5wlU,yTz+SH05wDod

DPmPxP!q#PXT>CJ=8<Dd{=(DE",kND0Visual Explain o

z1#

(}SH05wD SQL r XQuery odPmPxP!q4T>CJ=8<

*(}SH05wDodPmPxP!q4T>CJ=8<:

1. ZXFPDP,9*Tsw,1=R=y>}]b*9#

2. R|%wC}]b"S/vK%P!qT>5wodDz7G<#05wodDz

7G<10Zr*#

3. ;\*_P5wlUDodT>CJ=8<#OqodZ5wlUPP+T>*u

?0G1#+wj6*0i/E 11Du?(I\h*v/=R_E\R=i/E

P)#odD0CJ=8<10Zr*#

":C<GIBrOxPA!D#i/DZ;=P>ZC<DW?,xns;=P>

Z%?#

A!CJ=8<PD{E

CJ=8<TwDN=T>CJ=8Da9#wDZcm>:

v m - T>*XN

v w} - T>*bN

v Kc{ - T>*K_N#TQUEUE Kc{ - T>*=PD_N

v m/} - T>*y_N

TZKc{,Kc{`MR_(EPD}G?vZcD(;j6#ZKc{`MBD

}VG[FI>#

`XEn:

v :5wKc{;(6T\8O7)


v Z 47 3D:I>;

`XN<:

v Z 67 3D:TQUEUE Kc{;

9CuE,i4Es<Dwv?V

T>CJ=8<1T>DG{v<,rKzI\4;eCZxp?vZcDj8E

"#

ITS0CJ=810ZP9CuE,i4Es<Dwv?V:

1. +sj8k(;Z<s_uE,iuPD!v/rO#

2. s|%w"O/,i,1=<T>*zh*DEsH}*9#

*i4<Dd{?V,I9Cv/u#

*i4sx4SDCJ=8<,k9C0<Ev10Z#IT9CK0Z4Kbz}

Zi4C<DD;?V,9IEsr/@C<#;ZuErPD?VT>ZCJ=8

P#

*v//@<,I+sj8k(;Z0<Ev10ZP;vT>DxrO,4!sj

s|,;sF/sj,1=4=CJ=8<Ph*D?V#

`XEn:

v Z 47 3D:CJ=8<Zc;

8 Visual Explain LL

q!XZ<PTsD|`j8E"

ITCJPXCJ=8<PDTsD|`E"#zITT>:

v gBTsD53?<3FE":

– m"w}rm/}

– XZKc{DE",}g,I>"tTMdkTd?

– ZC/}rC'(eD/}

– mUd

– SQL r XQuery odP}CDP

v XZdCN}Ms(!n(E/N})DE"#

q!m"w}rm/}D3FE":

*i4<P%vm(XN)"w}(bN)rm/}(y_N)D?<3FE

",I+w|DZc#TZy!Ts,03FE"10Zr*,|+T>XZ

Z4(lU1P'D3FE"T010fZZ53?<mPDG)3FE"D

E"#

*i4`vm"w}rm/}D?<3FE",I%w?vTs(|+;vT

>)xP!q;;sY!qZc–>T>3FE"#TZy!D?vTs,<a

r*;v03FE"10Z#(b)0ZI\aX~,h*xP;)OEYw

E\CJyP0Z#)

g{5wPPD STATS_TIME u?|,3FE"4|Bu?,rm>E/w

4(CJ=81;P3FE"#rK,g{E/wh*3)3FE"44(C

J=8,|a9C1!5#g{E/w9C1!3FE",rZ05w1PP

|G+j6*(1!5)#

q!XZ<PKc{Dj8E":

*i4%vKc{(K_N)D?<3FE",I+w|DZc#TZy!K

c{,0Kc{1j8E"0Zr*,C0ZT>gBE":

v @FD[FI>(I/O"CPU 8nM\I>)

v yq*9Dy}(4,@FQw=DP})

v =8Pyq*9QCJ",SDm}

v yq*9QCJDG)mDP}

v yq*9Q&CD=J},|(|GD@F!qT

v ?vKc{DdkTd?}

*i4`vKc{Dj8E",I%w?vTs(|+;vT>)xP!q;

;s!qZc–>T>j8E"#TZy!D?vTs,<ar*;v03FE

"10Z#(b)0ZI\aX~,h*xP;)OEYwE\CJyP0

Z#)

q!XZ/}D3FE":

*i4ZC/}MC'(eD/}D?<3FE",k!qod–>T>3FE

"–>/}#S0/}10ZPT>DPmP!q;vr`vu?,;s%w7

(#TZy!D?v/},<ar*;v0/}3FE"10Z#

q!XZmUdD3FE":

Z 2 N. T>M9CCJ=8< 9

*i4mUdD?<3FE",!qod–>T>3FE"–>mUd#S0m

Ud10ZOT>DPmP!q;vr`vu?"%w7(#TZy!D?v

mUd,<+r*;v0mUd3FE"10Z#

q! SQL r XQuery odPPD3FE":

*i4 SQL r XQuery odP}CDPD3FE",I+wCJ=8<PD

m#0m3FE"10Zr*#%w}CDP4%#0}CDP10Zr*,

|P>mPDP#SCPmP!q;vr`vP,;s%w7(#TZ?vy

!P,wr*;v0}CDP3FE"10Z#

q!XZdCN}Ms(!nDE":

*i4XZdCN}Ms(!n(E/N})DE",IS0CJ=8<10

ZP!qod–>T>E/N}#0E/N}10Zr*,|+T>XZlU4

(1P'DN}5T0105DE"#

`XEn:

v Z 47 3D:CJ=8<Zc;

v Z 52 3D:=J;

|D<Db[

*|DgNT><DwVXw:

1. S0CJ=8<10ZP!qi4 –> hC#0CJ=8<hC1JG>r*#

2. *|D30+,I!q0<1!n(#

3. *|DwVKc{DU+,I9C0y>1"0)91"0|B1M0d{1!n

(#

4. *|Dm"w}rm/}ZcDU+,I!q0Yw}1!n(#

5. *8(ZKc{ZcPT>DV`MDE"(I>ry}`M,y}G=?0*9

@FD5XP}),!q0Kc{1!n(#

6. *8(ZmZcPGT>#={9GC'j6,!q0Yw}1!n(#

7. *8(GC=,T>Zc9GC},T>Zc,!q0Zc1!n(#

8. *Cy!D!n|B<"#fhC,%w&C#

B;=gNYw:

g{z}Z%;Vx}]b73P$w,r*A%;Vx}]b73Pk5wlUX

*Di/,ZK&ITKb;,Dw{n/ITgN|DMDxCJ=8#

g{z}ZVx}]b73P$w,r*AVx}]b73Pk5wlUX*Di

/,ZK&ITKb;,Dw{n/ITgN|DMDxCJ=8#

`XEn:

v Z 47 3D:I>;

`XNq:

v Z 11 3D:k%;Vx}]b73PD5wlU`X*Di/;

v Z 29 3D:kVx}]b73PD5wlU`X*Di/;

10 Visual Explain LL

Z 3 N. Z%;Vx}]b73PDxCJ=8

Z>NLP,z+Kb14PwVw{n/1y>i/DCJ=8M`X0ZgN|

D#(}9C;5P>},=x;)<},z+(}9C runstats |n"mSJ1D

w}4KbgNDxCJ=8D@F\I>(49Gr%i/DCJ=8D@F\I

>)#(}+Dvy>5wlUCw>},z+KbxPw{TZ}]bT\DX*

T#

1PK9C Visual Explain D-i1,z+"Vw{i/Dd{=(#

k%;Vx}]b73PD5wlU`X*Di/

k5wlU`X*Di/;`E* 1 – 4#?vi/<9C,; SQL r XQuery od

(ZZ 1 NPhv):

SELECT S.ID,S.NAME,O.DEPTNAME,SALARY+COMMFROM ORG O, STAFF SWHEREO.DEPTNUMB = S.DEPT ANDS.JOB <> ’Mgr’ ANDS.SALARY+S.COMM > ALL( SELECT ST.SALARY*.9


ORDER BY S.NAME

+G,i/D?N|z<HH04P9CK|`Dw{<I#}g,0i/ 11;Px

PT\w{,x0i/ 419CDw{<In`#wvi/.dDxphvgB:

i/ 1KPi/(;xw}M3FE")

i/ 2U/i/PmMw}D103FE"

i/ 34(i/PC4,SmDPODw}

i/ 44(mPDd{w}

`XNq:

v Z 12 3D:Z%;Vx}]b73PKPi/(;xw}M3FE");

v Z 15 3D:Z%;Vx}]b73P9C runstats 4U/mMw}D103FE";

v Z 19 3D:Z%;Vx}]b73PTCZ,Si/PDmDP4(w};

v Z 24 3D:Z%;Vx}]b73PTmP4(d{w};


Z%;Vx}]b73PKPi/(;xw}M3FE")

ZK>}P,* SQL i/4(KCJ=8,+G;xw}M3FE"#

*i4Ki/(i/ 1)DCJ=8<:



7G<10Zr*#

3. +wj6*0i/E 11Du?(I\h*v/=R_E\R=i/EP)#odD

0CJ=8<10Zr*#


TBPJbDXp+PzZzKbgNDxi/#

1. i/PD?vm<fZ103FE"p?

*lii/PD?vmGqfZ103FE",I+wCJ=8<PD?vmZ

c#Zr*D0m3FE"10ZP,g{4(lU1;PU/3FE",r5w

PBfD STATS_TIME P|,03FE"4|B1b8vJo#

g{103FE";fZ,E/w+9C1!3FE",C3FE"I\k5J3

FE";,#1!3FE"I0m3FE"10ZP5wPBfDJo01!51

4j6#

y]0m3FE"10ZPXZ ORG mDE",E/w9CK1!3FE"(Z5

w5T_8>)#r*4(lU15J3FE";IC,yT9C1!3FE"

(g STATS_TIME PPy>)#

Z 3 N. Z%;Vx}]b73PDxCJ=8 13

2. KCJ=89CKCJ}]DnP'=(p?

KCJ=8|,m(hxGw}(h#m(hT>*K_N"jG* TBSCAN#g

{Q9CKw}(h,|GaTbNT>"jG* IXSCAN#g{i!Y?}],r

9C*m4(Dw}Hm(hDI>|M#

3. KCJ=8D'{gN?

v1CJ=8yZ5J3FE"1E\7(|D'{#IZE/w9CCJ=8P

D1!3FE",yT;\7(C=8D'{gN#

;c45,&CGBCJ=8D\@FI>,TcUsk-}^)DCJ=8xP

HO#?vZcPP>DI>*[FI>,Si/DZ;=*<cp,1=CZc

("|(CZc)#

Z0CJ=810ZP,\I>s<* 1,067 timeron,T>Z<%?D RETURN (1)P#\@FI>2T>ZC0ZD%?xP#


4. B;=gNYw?

ZKP runstats .s,0i/ 21i4y>i/DCJ=8#9C runstats |n

*E/wa)PXi/CJDyPmD103FE"#

`XEn:

v Z 47 3D:CJ=8<Zc;

v Z 47 3D:I>;

`XN<:

v Z 67 3D:TBSCAN Kc{;

v Z 63 3D:IXSCAN Kc{;

Z%;Vx}]b73P9C runstats 4U/mMw}D103FE"

(}9C runstats |nU/103FE","y]Z0i/ 11PhvDCJ=84

9(K>}#

?R(iz9C runstats |n4U/XZmMw}D103FE",Xp1TON4

P runstats |nT4Q-"zKXsD|Bn/rQ4(KBw}1#baxE/w

a)n<7DE"47(nQDCJ=8#g{103FE";IC,E/way]

;<7D1!3FE"!q;vM'DCJ=8#


&7#Z|Bm.s9C runstats;qrE/wI\aO*CmGUD#g{Z0Kc

{j8E"10ZODy}HZc,rKJb\wT#ZKivB,jImD|B,

XBKP runstats |n"XB4(\0lDmD5wlU#

*i4Ki/(i/ 2)DCJ=8<:Z05wodDz7G<10ZP,+wj6

*0i/E 21Du?#Kod4PD0CJ=8<10Zr*#



ORG mD0m3FE"10ZT>E/w9C5J3FE"(STATS_TIME 5G

U/3FE"D5J1d)#3FE"D<7T!vZTSKP runstats |nT4

GqTmDZ]wKXs|D#



k0i/ 11;y,0i/ 21PDCJ=89Cm(h(TBSCAN)x;Gw}(

h(IXSCAN)#!\103FE"fZ,+IZi/yCDPO;Pw},yT4

4Pw}(h#Dxi/D;v=(GxE/wa)C4,SmDPO(4,S=

J)#ZK>}P,bGZ;vO"(h,S:HSJOIN (7)#


Z HSJOIN (7) Kc{D0Kc{j8E"10ZP,i4dkTd?BfD,S=

J;Z#ZK,SYwPy9CDPP>ZD>PBf#K>}P,b)P*

DEPTNUMB M DEPT#


3. KCJ=8D'{gN?

yZnB3FE"DCJ=8<Uazz5JD@FI>(T timeron F)#IZ0i

/ 11PD@FI>yZ1!3FE",yT;\HO=vCJ=8<DI>47(

D;vCJ=8|P'#kI>D_M^X#XkHOyZ5J3FE"DCJ=

8DI>,E\C=<7DP'T@@#

4. B;=gNYw?

0i/ 31i4T DEPTNUMB M DEPT PmSw}D'{#T,S=JP9CD

PmSw}Ia_T\#

`XEn:

v Z 52 3D:=J;

`XN<:



Z%;Vx}]b73PTCZ,Si/PDmDP4(w}

K>}(}T STAFF mOD DEPT PT0 ORG mOD DEPTNUMB P4(w},

"y]0i/ 21PhvDCJ=8x9(#I9ChFKJLr44((iDw}#



":!\4(K DEPTNUM Dw},+GE/w;a9C|#



1. ZxPw}DCJ=8P|DK24Z]?

6W-7,S NLJOIN (7) Q!zKCZ0i/ 21DO"(h,S HSJOIN (7)#

9C6W-7,S9C@FI>HO"(h,SD@FI>*M,r*K`MD,

S;h*NNErrY1m#

Q+;vBDbNZc I_DEPT mSZ STAFF mOf#KZcm>T DEPT 4(

Dw},|T>E/w9CDGw}(hx;Gm(h47(*lwD)P#


"b,ZCJ=8<DK?VP,T DEPT P4(KBw}(I_DEPT),"9CK

IXSCAN (17) 4CJ STAFF m#Z0i/ 21P,9Cm(h4CJ STAFF m#


IZmSKw},rK9CK IXSCAN Zc IXSCAN (17) 4CJ STAFF m#0i

/ 21;Pw};rK,ZC>}P9CKm(h#

FETCH Zc FETCH (11) T>v ,}K9Cw}(h4lwP DEPT .b,E

/w9+w}Cw8kS STAFF mPlwd{P#ZKivB,Fcvw}(hM

CfiOZ;pDI>HH0CJ=8P9CDj{m(hDI>*M#

":STAFF mDZcvV=N,TT>|k DEPT Dw}M FETCH YwDX5#


Ki/DCJ=8T>4(XZ,S=JPyf0DPDw}D'{#w}2IT

SY>X=JD&C#CRGi4Ki/P?vmD>X=J,Ti4+w}mS

A>X=JPy}CDPGgN0lCJ=8D#

Z FETCH (11) Kc{D0Kc{j8E"10ZP,i4[FXTBfDP#K

CfYwD=JPy9CDP* JOB,g0=J1;ZPy>#

":K=JD!qTG .69#bb6ETZK=J+;!q 69% DPxPx;=&

m#


FETCH (11) Kc{D0Kc{j8E"10ZT>KYw}Z9CDP#zIT4

=,DEPTNAME P>ZdkTd?BDlwDPT_DZ;PP#

3. KCJ=8D'{gN?

KCJ=8HH0>}PDCJ=8DI>|M#[FI>QS0i/ 21PD<

1,755 timeron uYA0i/ 31PD< 959 timeron#

+G,0i/ 31DCJ=8T> STAFF mDw}(h IXSCAN (17) M FETCH

(11)#1w}(hkCfYwiOZ;pDI>!Zj{m(hDI>1,Mb6

ETZ?;vlw=DP<*CJ;Nm"CJ;Nw}#&"TuYT STAFF m

DbV+XCJ#

4. B;=gNYw?

0i/ 41+CfMw}(huYA;PCfD%vw}(h#4(d{w}I\a

5MCJ=8D@FI>#

`XEn:

v Z 47 3D:CJ=8<Zc;

v Z 52 3D:=J;

`XN<:

v Z 64 3D:NLJOIN Kc{;


v Z 60 3D:FETCH Kc{;

Z%;Vx}]b73PTmP4(d{w}

K>}(}T STAFF mPD JOB P4(w}"+ DEPTNAME mSA ORG mDV

Pw}P(mS%@Dw}I\a<BnbDCJ),"y]Z0i/ 31PhvDC

J=8x9(#





1. KCJ=8IZ4(=Sw}x|DKD)Z]?

E/wQ-{CKT STAFF mPD JOB P4(Dw}(CjG* I_JOB DbN

m>)DEc,Tx;=DxKCJ=8#


"b,ZCJ=8<DPd?V,TZ ORG m,H0Dw}(hMCfQ|D*v

w}(h IXSCAN (9)#+ DEPTNAME PmSAT ORG mDw}Q9E/w;

X*xPCfxvnbDCJ$w#


2. KCJ=8D'{gN?

KCJ=8HH0>}PDCJ=8DI>|M#[FI>QS0i/ 31PDs<

1,370 timeron uYA0i/ 41PDs< 959 timeron#


Z 4 N. ZVx}]b73PDxCJ=8

Z>NLP,z+Kb14PwVw{n/1y>i/DCJ=8M`X0ZgN|

D#(}9C;5P>},=x;)<},z+(}9C runstats |n"mSJ1D

w}4KbgNDxCJ=8D@F\I>(49Gr%i/DCJ=8D@F\I

>)#(}+Dvy>5wlUCw>},z+KbxPw{TZ}]bT\DX*

T#

1PK9C Visual Explain D-i1,z+"Vw{i/Dd{=(#

kVx}]b73PD5wlU`X*Di/

k5wlU`X*Di/;`E* 1 – 4#?vi/<9C,; SQL r XQuery od

(ZZ 1 NPhv):

SELECT S.ID,S.NAME,O.DEPTNAME,SALARY+COMMFROM ORG O, STAFF SWHEREO.DEPTNUMB = S.DEPT ANDS.JOB <> ’Mgr’ ANDS.SALARY+S.COMM > ALL( SELECT ST.SALARY*.9


ORDER BY S.NAME

+G,i/D?N|z<HH04P9CK|`Dw{<I#}g,0i/ 11;Px

PT\w{,x0i/ 419CDw{<In`#wvi/.dDxphvgB:

i/ 1KPi/(;xw}M3FE")

i/ 2U/i/PmMw}D103FE"

i/ 3TCZ,Si/PmDP4(w}

i/ 4TmP4(d{w}

b)>}GZ_P 7 vomZcD DB2 s5)9f NT 2000 zwO9CVxd"P

TzID#

`XNq:

v Z 30 3D:ZVx}]b73PKPi/(;xw}M3FE");

v Z 32 3D:ZVx}]b73P9C runstats 4U/mMw}D103FE";

v Z 36 3D:ZVx}]b73PTCZ,Si/PDmDP4(w};

v Z 40 3D:ZVx}]b73PTmP4(d{w};


ZVx}]b73PKPi/(;xw}M3FE")

ZK>}P,* SQL i/4(KCJ=8,+G;xw}M3FE"#

*i4Ki/(i/ 1)DCJ=8<:



7G<10Zr*#

3. +wj6*0i/E 11Du?(I\h*v/=R_E\R=i/EP)#odD

0CJ=8<10Zr*#



*lii/PD?vmGqfZ103FE",I+wCJ=8<PD?vmZ

c#Zr*D`&0m3FE"10ZP,5wPBfD STATS_TIME P|,03

FE"4|B1b8vV,bm>Z4(lU1;PU/3FE"#

g{103FE";fZ,E/w+9C1!3FE",C3FE"I\k5J3

FE";,#1!3FE"I0m3FE"10ZP5wPBfDJo01!51

4j6#


y]0m3FE"10ZPXZ ORG mDE",E/w9CK1!3FE"(Z5

w5T_8>)#r*4(lU15J3FE";IC,yT9C1!3FE"

(g STATS_TIME PPy>)#


KCJ=8|,m(hxGw}(h#m(hT>*K_N"jG* TBSCAN#g

{Q9CKw}(h,|GaTbNT>"jG* IXSCAN#g{i!Y?}],r

9C*m4(Dw}Hm(hDI>|M#

3. KCJ=8D'{gN?

v1CJ=8yZ5J3FE"1E\7(|D'{#IZE/w9CCJ=8P

D1!3FE",yT;\7(C=8D'{gN#

;c45,&CGBCJ=8D\@FI>,TcUsk-}^)DCJ=8xP

HO#?vZcPP>DI>*[FI>,Si/DZ;=*<cp,1=CZc

("|(CZc)#

":TZVx}]b,bG9Cn`J4DZcD[FI>#

Z0CJ=810ZP,\I>s<* 1,234 timeron,T>Z<%?D RETURN (1)P#\@FI>2T>ZC0ZD%?xP#

Z 4 N. ZVx}]b73PDxCJ=8 31

4. B;=gNYw?

ZKP runstats .s,0i/ 21i4y>i/DCJ=8#9C runstats |n

*E/wa)PXi/CJDyPmD103FE"#

`XEn:

v Z 47 3D:CJ=8<Zc;

v Z 47 3D:I>;

`XN<:



ZVx}]b73P9C runstats 4U/mMw}D103FE"

(}9C runstats |nU/103FE","y]Z0i/ 11PhvDCJ=84

9(K>}#

?R(iz9C runstats |n4U/XZmMw}D103FE",Xp1TON4

P runstats |nT4Q-"zKXsD|Bn/rQ4(KBw}1#baxE/w

a)n<7DE"47(nQDCJ=8#g{103FE";IC,E/way]

;<7D1!3FE"!q;vM'DCJ=8#


&7#Z|Bm.s9C runstats;qrE/wI\aO*CmGUD#g{Z0Kc

{j8E"10ZODy}HZc,rKJb\wT#ZKivB,jImD|B,

XBKP runstats |n"XB4(\0lDmD5wlU#





ORG mD0m3FE"10ZT>E/w9C5J3FE"(STATS_TIME 5G

U/3FE"D5J1d)#3FE"D<7T!vZTSKP runstats |nT4

GqTmDZ]wKXs|D#



k0i/ 11;y,0i/ 21PDCJ=89Cm(h(TBSCAN)x;Gw}(

h(IXSCAN)#!\103FE"fZ,+IZi/yCDPO;Pw},yT4

4Pw}(h#Dxi/D;v=(GxE/wa)C4,SmDPO(4,S=

J)#ZK>}P,bGZ;vO"(h,S:HSJOIN (9)#


Z HSJOIN (9) Kc{D0Kc{j8E"10ZP,i4dkTd?BfD,S=

J;Z#ZK,SYwPy9CDPP>ZD>PBf#K>}P,b)P*

DEPTNUMB M DEPT#


3. KCJ=8D'{gN?

yZnB3FE"DCJ=8<Uazz5JD@FI>(T timeron F)#IZ0i

/ 11PD@FI>yZ1!3FE",yT;\HO=vCJ=8<DI>47(

D;vCJ=8|P'#kI>D_M^X#XkHOyZ5J3FE"DCJ=

8DI>,E\C=<7DP'T@@#

4. B;=gNYw?

0i/ 31i4T DEPTNUMB M DEPT PmSw}D'{#T,S=JP9CD

PmSw}Ia_T\#

`XEn:

v Z 52 3D:=J;

`XN<:



ZVx}]b73PTCZ,Si/PDmDP4(w}

K>}(}T STAFF mOD DEPT PT0 ORG mOD DEPTNUMB P4(w},

"y]0i/ 21PhvDCJ=8x9(#I9ChFKJLr44((iDw}#



":!\4(K DEPTNUM Dw},+GE/w;a9C|#



1. ZxPw}DCJ=8P|DK24Z]?

Q+;vBDbNZc I_DEPT mSZ STAFF mOf#KZcm>T DEPT 4(

Dw},|T>E/w9CDGw}(hx;Gm(h47(*lwD)P#



i/DCJ=8T>v4(PX ORG mD DEPTNUMB PDw}D'{,a{C

FETCH (15) M IXSCAN (21) m>,xZ STAFF mD DEPT PO#0i/ 21

;PKw};rK,ZC>}P9CKm(h#


FETCH(15) Kc{D0Kc{j8E"10ZT>KYw}Z9CDP#


Fcvw}MCfiOZ;pDI>HH0CJ=8P9CDj{m(hDI>*

M#

3. KCJ=8D'{gN?


1,214 timeron uYA0i/ 31PDs< 755 timeron#

4. B;=gNYw?

0i/ 41+CfMw}(huYA;PCfD%vw}(h#4(d{w}I\a

5MCJ=8D@FI>#

ZVx}]b73PTmP4(d{w}

K>}(}T STAFF mPD JOB P4(w}"+ DEPTNAME mSA ORG mDV

Pw}P(mS%@Dw}I\a<BnbDCJ),"y]Z0i/ 31PhvDC

J=8x9(#





1. KCJ=8IZ4(=Sw}x|DKD)Z]?

"b,ZCJ=8<DPd?V,TZ ORG m,H0Dm(hQ|D*w}(h

IXSCAN (7)#+ DEPTNAME PmSA ORG mDw}Q9E/wIDxf0m(

hDCJ#


"b,ZCJ=8<DW?,TZ STAFF m,H0Dw}(hMCfQ|D*vw

}(h IXSCAN (39)#T STAFF m4( JOB w}Q9E/w;X*xPCfx

vnbDCJ$w#


2. KCJ=8D'{gN?


753 timeron uYA0i/ 41PDs< 288 timeron#


=< A. Visual Explain En

v CJ=8

v CJ=8<

v CJ=8<Zc

v /:

v ]w

v I>

v NjVi

v }]b\mDmUd

v /, SQL r XQuery

v 5wlU

v I5wod

v 5wod

v Yw}

v Kc{

v E/w

v Lr|

v =J

v i/E/`

v =JD!qT

v GM,S

v 2, SQL r XQuery

v 53\mDmUd

v mUd

v Timeron

v Visual Explain

CJ=8

*bvI5w SQL r XQuery od,3)}]GXhD#CJ=88(CJK}]D

Yw3r#CJ=8ICzi4y!m"w}rPD3FE""Kc{DtT"+V

E"(gmUdM/}3FE"H)T0kE/PXDdCN}#hz Visual Explain,

zIT<N==i4 SQL r XQuery odDCJ=8#

?1`kK;uI5w SQL r XQuery od1,E/wMzz;vCJ=8#TZ2

,od,b"zZ<8/s(1,xTZ/,od,r"zZKP1#

CJ=8GyZICE"D@F,Kbb;c\X*#xE/wD@FrGyZgB

y>DE":


v 53?<mPD3FE"(g{3FE";GnBD,r9C RUNSTATS |n|B

|G#)

v dCN}

v s(!n

v i/E/`

kCJ=8`X*DI>E"GE/wTi/DJ4{CJDnQ@F#i/5Jy

CD1df DB2 6'bD;)rX(}g,,1KPDd{&CLr})d/xd/#

(}9CT\`S,IZKPCi/1?H5JyC1d#

`XEn:

v Z 46 3D:CJ=8<;

v :Visual Explain Ev;(6\m8O:5)7)

`XNq:

v :/,5w SQL r XQuery od;(6\m8O:5)7)

v :i4CJ=8D<Nm>(;(6\m8O:5)7)

v :i4Lr|DI5wod;(6\m8O:5)7)

v :i4H05wDi/odDz7G<;(6\m8O:5)7)

CJ=8<

Visual Explain 9C4T`v4DE"Tzz;vCJ=8<,gB}y>#y];,

Ddk,E/w!q;vCJ=8,Visual Explain ZCJ=8<PT>CCJ=8#

C<PDZcm>mMw}T0Tb)mMy4PD?vYw#Zc.dD4Sm>

}]w#

`XEn:

v Z 45 3D:CJ=8;


`XNq:


v :i4H05wDi/odDz7G<;(6\m8O:5)7)

v :/,5w SQL r XQuery od;(6\m8O:5)7)

v :i4CJ=8D<Nm>(;(6\m8O:5)7)

v :i4Lr|DI5wod;(6\m8O:5)7)

CJ=8<Zc

CJ=8<IT>ZcDwiI#b)Zcm>:

v m - T>*XN

v w} - T>*bN

v Kc{ - T>*K_N(8 u_)#TQUEUE Kc{ - T>*=PD_N

v m/} - T>*y_N(6 u_)

`XEn:

v Z 45 3D:CJ=8;

v Z 46 3D:CJ=8<;

/:

P1,IZ|B5MKw}k}]3.dfZD/:H,yTa<B}]3ODP|

D;C#Xiky!w}`XDm+T}]XB("/:#("K/:Dw}TZx

P6'=JDPG#PC,r*|JmTy>mPD}]w|P'D3rCJ#IZ

`FD5Z,;}]3O,SxuY3CfN}#

(#,mP;P;vw}IT_PO_D/:H#

*liw}D/:H,I+w|DZcTT>0w}3FE"10Z#/:HJr/

:rSD5T>ZK0ZP#g{C5OM,&<GXim}]#

`XN<:

v Z 75 3D:4(w}D<r;

]w

]wG}]Domf";C#|kmUdX*,ITGD~"?<rh8#

`XEn:

v Z 55 3D:mUd;

I>

Z Visual Explain DOBDP,I>G4Pod(rodD*X)DCJ=8@FyX

h9CDJ4\?#I>GI CPU I>(T8n}F)M I/O(T0@}M3D*;

}F)DiOCvD#

I>D%;G timeron#timeron ;1SHZNN5JDyC1d,;GxvVT@FD

J4(I>),@FDJ4G}]b\mw4P,;i/D=V=8yXhD#

=< A. Visual Explain En 47

CJ=8<D?;Kc{ZcPT>DI>G[FI>,GS*<4PCJ=8=4

PCX(Kc{(|(4Ps_ZZ).d[FD#|;P43ng53$w:Xr

5X}]PxC'DI>.`DrX#

`XEn:

v Z 56 3D:Timeron;

NjVi

NjViG;nuY*zD<u,|I9}]b\mwZ%vYwPlwPPD;v

i#&mb)P1|G;f"Z_Y:fP#1&CLr"v OPEN CURSOR ks1

Vd_Y:f,x1XUNj1ME_Y:f#&mjyPDPs,4lwPPDm

;vi#

*8(NjViD`M,I+ PREP r BIND |nD BLOCKING !nkBPN};

p9C:

UNAMBIGv+G#}NjVi(1!5)#

ALL #}NjkG#}Njy;Vi#

NO ;+NjVi#

`XNq:

v :8(PVi4uY*z;(6T\8O7)

`XN<:

v :BIND command;(Command Reference)

v :PRECOMPILE command;(Command Reference)

}]b\mDmUd

}]bPITfZ=V`MDmUd:}]b\mU(DMS)M53\mUd

(SMS)#

DMS mUdI}]b\mw\m,"RI|xPhFMw{Tzchs#

DMS mUd(e|(D~(rh8)Pm,}]b}]Td DMS mUdq=f"Z

b)D~(rh8)P#

ImS$VdDD~(rh8)AVPD DMS mUdTvsdf"]?#}]b\m

wT/XB=btZCmUdDyP]wPDVP}]#

DMS M SMS mUdI2fZ,;}]bP#

`XEn:

v Z 55 3D:53\mDmUd;


/, SQL r XQuery

/, SQL r XQuery odGZLrKP1Z&CLrZ<8M4PD SQL r XQuery

od#Z/, SQL r XQuery P,ITGTB=Viv.;:

v 9C CLI r CLP ;%X"v SQL r XQuery od

v SQL r XQuery 4|,Z&CLrP6kDwoTd?P#

1 DB2 KP/, SQL r XQuery od1,|4(;vyZ10?<3FE"MdC

N}DCJ=8#KCJ=8ITS;Nod&CLrD4P;AB;N#

/, SQL r XQuery Dm;VN=G2, SQL r XQuery#

`XEn:

v Z 55 3D:2, SQL r XQuery;

5wlU

hz Visual Explain,ITli5wlUDZ]#

5 w l U G ; 9 u D E " , b ) E " G Z 5 w S Q L o d 1 U / D # Z

EXPLAIN_STATEMENT mP|;f"*~xFsTs(BLOB),"|,BPE":

v CJ=8DZ?m>,|(|DKc{"mMCJDw}

v E/w9CDP(u~,|(}]bTsD3FE"0?NYwD[FI>#

th*T> SQL odCJ=8D<Nm>,5wlUGXhD#*7#\;4(5w

lU,r:

1. }]b\mwPXkP5wmTf"5wlU#XZgN4(b)mDE",Ik

ND*zozPD4(5wm #

2. TZ|,2, SQL r XQuery odDLr|,Zs(r<8Lr|1+ EXPLSNAP

!nhC* ALL r YES#by+*Lr|P?uI5w SQL odq!;v5w

lU#PX BIND M PREP |nD|`E",kND Command Reference#

3. TZ/, SQL od,Zs("vb)odD&CLr1,+ EXPLSNAP !nhC

* ALL,r_Z;%X"vod.0+ CURRENT EXPLAIN SNAPSHOT (CD

fwhC* YES r EXPLAIN#PX|`E",kND SQL Reference PXZ10

5wlU;Z#

`XNq:

v Z 3 3D:9C5wlU;

`XN<:




I5wod

I5wodGITd4P5wYwD SQL r XQuery od#

I5w SQL r XQuery od|(:

v SELECT

v INSERT

v UPDATE

v DELETE

v VALUES

`XEn:

v Z 50 3D:5wod;

5wod

5wodGQ*d4P5wYwD SQL r XQuery od#5wodT>Z05wod

z710ZP#

`XEn:

v Z 50 3D:I5wod;

Yw}

Yw}G*Td4PYwD5e#}g,mrw}G`VKc{(g TBSCAN M

IXSCAN)DYw}#

`XEn:

v Z 50 3D:Kc{;

Kc{

Kc{*4GXkT}]4PDYw,*4G4P SQL r XQuery odDCJ=81

4Tmrw}Ddv#

BPKc{IvVZCJ=8<P:

CMPEXPFcmo=#(vJCZwT==#)

DELETESmP>}P#

EISCAN(hC'(eDw},zI+rDPw#

FETCHS9CX(G<j6DmPCfP#

FILTER(}&C;vr`v=J4}K}]#


GENROWzImP#

GRPBY48(Pr/}D+25+PVi"T//}s5#

HSJOINm>"P,S,ZK,S==B,53T=vr`vmD,SPxP"P&

m#

INSERT+PekmP#

IXANDT4T=vr`vw}(hDPj6(RID)4P0k1(AND)Kc#

IXSCANCI!Dt//#9u~(hmDw},SxzzPrPw#

MSJOINm>O",S,dPb?kZ?m<Xk{O,S=J3r#

NLJOINm>6W-7,S,C,S*b?mD?;PCJ;NZ?m#

PIPE +MP#(vJCZwT==#)

RETURNm>4TTC'Di/D}]5X#

RIDSCNT;vr`vw}qCDPj6(RID)PmxP(h#

RPD (Remote PushDown)CZ6L=8DKc{#}K;|( SQL r XQuery od.b,|kf> 8

PD SHIP Kc{G#`F(ZH0f>P* RQUERY Kc{)#

SHIP S6L}]b4lw}]#CZ*O53P#

SORT 48(PD3rTPxPEr"{}X4u?(I!)#

TBSCAN(}S}]31SA!yPXh}]4lwP#

TEMP +}]f"=Y1mPT8XA(I\aG`N)#

TQUEUEZ}]bzmLr.d*Fm}]#

UNION"C4T`vmDPDw#

UNIQUE{}3)8(DPP_PX45DP#

UPDATE|BmPDP#

XISCAN(h XML mDw}#


XSCAN/@ XML D5ZcSw#

XANDORJm+xPK0k1(AND)M0r1(OR)KcD=J&CZ`v XML w

}#

`XEn:

v Z 50 3D:Yw};

E/w

E/wG SQL `kwDi~,|*}]YwoT(DML)SQL od!qCJ=8#|

G(}+`V8CCJ=8D4PI>("#M,;sSP!q;v_Pn!@FI

>DCJ=844PD#

`XEn:

v Z 53 3D:i/E/`;

Lr|

Lr|Gf"Z}]bPDTs,C}]b|(&mk&CLrD;v4D~`X*

D SQL odyh*DE"#|IITBYw.;zI:

v C PREP |n$`k4D~

v C BIND |ns(I$`kwzIDs(D~

`XN<:



=J

=JG;vQwu~D*X,|m>r~,;vHOYw#=J|(ZT WHERE r

HAVING *<DSdP#

}g,ZBP SQL odP:

SELECT * FROM SAMPLEWHERE NAME = ’SMITH’ ANDDEPT = 895 AND YEARS > 5

TBG=J:NAME = ’SMITH’"DEPT = 895 T0 YEARS > 5#

=JV*TB`p(d3r*SnP'D='JnMD):

1. *<M#9u~+w}(hV`(u-)#(b)u~2;Fw6'(g=J#)

2. ITy]w}4@@w}3(4y=Dw}XF)=J,r*=JPf0DPGw

}|D;?V#

3. ;\Sw}4@@}]3(4y=D}]XF)=J,+G1PTtZ:exP1

rIT@@#


4. #t=J(#}KTy>mDr%CJ.b9h* I/O,"RXkZ+}]4Fv:

f3.sEI&C#|G|(,PSi/D=J,rG)A!f"ZkmVtDD

~PD LONG VARCHAR r LOB }]D=J#

1hF=J1,&CTI\Dn_!qT*?jT95XDPnY#

TB`MD=JGnP'Rn#CD:

v TZO",S,r%DH=,S=JGXhD#|Dq=* table1.column =

table2.column,"Jm=v;,mPDP`HTc,Sm#

v >X=JvJCZ;vm#

`XEn:

v Z 54 3D:=JD!qT;

i/E/`

i/E/`GCZ`ki/D;ii/X4frME/<u#

w*Di/E/`:

1 \^FDE/#1ZfM&mJ4\=Oq^F1\PC#k0f> 11a)

DE/sBH,#

2 r%E/#8(;vH0f> 11_DE/6,+k6p 3 0|_6p`H,

E/I>Tx5M,XpGTZG#4SDi/xT|GgK#

3 JHDE/#8uk DB2 MVS™/ESA fDi/E/Xw}C%d#

5 }#E/#(iCZ,19Cr%BqM4Si/DlO73#

7 }#E/#6p 7 }K;uYCZ4S/,i/Di/E/?Tb,|ki/

E/ 5 `,#

d{vCZXbivBDi/E/`*:

0 n!E/#v1h*\Yr;h*E/1(4,T_Pw7w}DmDG#r

%Di/1)9C#

9 nsE/#dV9CZfM&mJ4#v16p 5 &m\&;;19C(4,

CZZ6p 5 4PC;;CDG#4SRQ1Di/)#

(#,O_DE/6pCZ2,i/M$F+(Q\$1d4PDi/,xOME/

6prCZ/,a;DrvKP8NDr%i/#

*hC/, SQL r XQuery odDi/E/,kZ|nP&mwPdkTB|n:

SET CURRENT QUERY OPTIMIZATION = n;

dP0n1GyhDi/E/`#

*hC2, SQL r XQuery odDi/E/,IZ BIND r PREP |nP9C

QUERYOPT !n#

`XEn:

v Z 52 3D:E/w;


`XN<:



=JD!qT

!qT8NN;P+zc=J(4*f)DI\T#

}g,T_P 1,000,000 PDmYwD=J!qT* 0.01(1%),b6EC=J5Xy

@@D 10,000 P(1,000,000 D 1% ),xOzy@@D 990,000 P#

;c#{9C!qTO_D=J(!qT!ZHZ 0.10)#byD=J5XOYDPT

)+4DKc{9C,rx*sOYD CPU M I/O 4zci/#

>}

YhP;vmP 1,000,000 P,R-<Di/|,;vh*=SEr=hD0ORDER

BY1Sd#C;v!qT* 0.01 D=J,XkTy@@D 10,000 PxPErYw#

+G,C 0.50 b;O!D!q=J,rXkTy@@D 500,000 PxPErYw,r

xh*|`D CPU M I/O 1d#

`XEn:

v Z 52 3D:=J;

GM,S

;i,S,1B5m(sMPkm);,SA~,r`,m(O!Dm,|,B5m

PP5Dhv)1;4wGM,S#

GM,SI 3 vw*?ViI:

v k,S

v Tk,SDa{xP0w} AND1

v jICk,S

|mV*C;v IXAND Kc{.p4D=vr|`v,S#

k,SG,SD;VXbN=,bV,SDa{;GZ?mD0Pj61(RID),x

;GZ?Mb?mPD,S#

GM,S9C0k,S14T0w} AND1Kc{a)0Pj61#C0w} AND1

Kc{[SwV,SD}K'{#0w} AND1Kc{Ddv;Mk0w} OR1Kc

{P,b+T0Pj61Er,"{};MkC0w} AND1Kc{D,SyI\zI

DNNX4P#;s9C Fetch Kc{CfCB5mPDP#ns,Cr/DB5mk

yPD,m`,S,SxjIC,S#

T\(i:

v Z?v,m,SDB5mO4(w}#


v 7#ErQP5c;_,TJmVd0w} AND1Kc{D;}Kw#TZGM,

S,bI\h*`o 12MB r 3000 4K 3#TZVxZ"PT,C;}KwGSk

2mErQ`,D2mZfNPVdD,+|\ sortheap }]bdCN}M

sheapthres_shr }]bdCN}^F#

v T,m&C}K=J#g{3FE";GnBD,r9C runstats |n|B|G#

`XN<:

v Z 62 3D:IXAND Kc{;

v :RUNSTATS command;(Command Reference)

v Z 76 3D:9C RUNSTATS;

2, SQL r XQuery

2, SQL r XQuery od6kZ&CLrP#ZIT4P&CLr.0,yPb)6

WodXk;$`kMs(=Lr|P#*4P2, SQL PD XQuery mo=,I9

C XMLQUERY /}#

1 DB2 `kb)od1,|*?vod4(;vCJ=8,C=8yZ$`kMs(

b)od1D?<3FE"MdCN}#

?1KP&CLr1<*9Cb)CJ=8;ZYNs(Lr|.0|G;aDd#

2, SQL r XQuery Dm;VN=G/, SQL r XQuery#

`XNq:

v :Executing XQuery expressions in embedded SQL applications;(Developing Embedded

SQL Applications)

53\mDmUd

}]bPITfZ=V`MDmUd:53\mUd(SMS)M}]b\mUd

(DMS)#

SMS mUdIYw53\m,|+}]b}]f"=4(mUd1yVdDUdP#m

Ud(e|(f"K}]D;vr`v?<76DPm#

D~53\m=ef"wDVdM\m#

SMS M DMS mUdI2fZ,;}]bP#

`XEn:

v Z 48 3D:}]b\mDmUd;

mUd

g{+sM}]b.V*%@\mDF*mUdD?~,rHO]W\m#


mUdJmz+}];CVd=X(D_-h8r|GDw?VP#}g,14(m

1,I8(+|Dw}r|DxP$rsTs(LOB)}]D$Pkd`Dm}]V

*4#

mUdIV<Z;vr`vomf"h8(]w)OTa_T\#+G,(i;vm

UdPDyPh8r]w_P`FDT\Xw#

IT=V;,D=(4\mmUd:w*53\mUd(SMS)rw*}]b\mU

d(DMS)#

`XEn:

v Z 47 3D:]w;

Timeron

Timeron G DB2 DI>F?%;#Timeron >m";GNN5JD CPU 4P1d,

xGy]y!CJ=8xv4PX(i/yhJ4D`T?H@F5#

T timeron FD@Fi/I>"4$bCi/D4P1d#+G,ywD@FIT*H

O,;73P`,$w:XBD=vi/a)y!#}g,Zb?rX(}g2~]

?M""$w:X)`,DivB,HI>OMDr%i/`H,f04S,SMs

Mm(hD_I>i/D4P1d&CaO$#

`XEn:

v Z 47 3D:I>;

Visual Explain

":Sf> 6 *<,;Y\S|nPwC Visual Explain#+G,T;ITSXFPD

PDwV}]bTs4wC|#TZKf>,D5Lx9C{F Visual Explain#

Visual Explain JmzT<N==i4Q5wD SQL r XQuery odD CJ=8#I

T9C<Pa)DE"4w{i/,TqC|CDT\#

CJ=8<T>BPnDj8E":

v m(0d`X*DP)Mw}

v Kc{(}g,m(h"ErT0,S)

v mUdM/}#

9IT9C Visual Explain 4PBPYw:

v i4E/19CD3FE"#;sIT+b)3FE"k10?<3FE"xPH

O,Tozz7(XBs(Lr|GqITDxT\#

v 7(Gq9CKw}4CJm#g{49Cw},r Visual Explain ITozz7(

D)PIT(}xPw}xqCC&#

v (}HOw{.0M.sDCZi/DCJ=8<f>,i44PwVw{<ID

'{#

v q!CJ=8PXZ?vYwDE",|(\@FI>Mylw=DP}(y})#

*t/ Visual Explain::


v ZXFPDP,R|%w}]b{F"!qT>5wodz7G<r5wi/#

v Z0|n`-w1P,Z0;%13r0E>13O4PI5wod#

v Z Query Patroller P,%w0\\i/tT1JG>r0z7i/tT1JG>PD

T>CJ=8#

`XEn:



=< B. 4V83rEPD Visual Explain Kc{DPm

v CMPEXP Kc{

v DELETE Kc{

v EISCAN Kc{

v FETCH Kc{

v FILTER Kc{

v GENROW Kc{

v GRPBY Kc{

v HSJOIN Kc{

v INSERT Kc{

v IXAND Kc{

v IXSCAN Kc{

v MSJOIN Kc{

v NLJOIN Kc{

v PIPE Kc{

v RETURN Kc{

v RIDSCN Kc{

v RPD Kc{

v SHIP Kc{

v SORT Kc{

v TBSCAN Kc{

v TEMP Kc{

v TQUEUE Kc{

v UNION Kc{

v UNIQUE Kc{

v UPDATE Kc{

v XISCAN Kc{

v XSCAN Kc{

v XANDOR Kc{

CMPEXP Kc{

Kc{{:CMPEXP

m>:PdrnUa{yh*Dmo=Fc#

(KKc{vCZwT==#)

`XEn:


v Z 50 3D:Kc{;

DELETE Kc{

Kc{{:DELETE

m>:TmPPD>}#

KKc{m>;vXhDYw#*5MCJ=8DI>,IQ"b&/PZ(e*>

}DP/Dd{Kc{(}g,(hM,S)O#

T\(i:

v t*SmP>}yPDP,rI<G9C DROP TABLE odr LOAD REPLACE|n#

`XEn:

v Z 50 3D:Kc{;

EISCAN Kc{

Kc{{:EISCAN

m>:KKc{(hC'(eDw}4zI+rDPw#K(h9CC'a)D6'

zI/}PD`vt//#9u~#

ZCJy>m(yZ=J)0I4PKYw4u!^(P/#

T\(i:

v P1,}]b|BI\}pw};VN,Sx<B}`Dw}3#bI(}>}"

XB4(w}r_Xiw}4|}#

v g{3FE";GnBD,r9C runstats |n|B|G#

`XEn:

v Z 50 3D:Kc{;

FETCH Kc{

Kc{{:FETCH

m>:9CX(DPj6(RID)SmPCfP#

T\(i:

v )9w}|T|(yCfDP,Sx;XG*CJ}]3#

v iRkCf`XDw},+w|DZcTT>d3FE"0Z#7#Cw}D/:

H\_#

v g{CfyhDdk/dv(I/O)HmPD3}s,rIvs:exs!#

v g{3FE";GnBD,r|B|G#


V;}M_553FE"a)XZ=J!qTDE",b)E"7(N1!qw}

(hx;Gm(h#*|Bb)3FE",I9CxP WITH DISTRIBUTION Sd

D runstats |nTmxPYw#

`XEn:

v Z 50 3D:Kc{;

FILTER Kc{

Kc{{:FILTER

m>:#t=JD&C,Tcy]=Ja)Du~T}]xP}K#

T\(i:

v 7#9Cvlwyh}]D=J#}g,7#=JD!qT5m>h*5XDG?

Vm#

v 7#E/6pAY* 3 T9E/w9C,Sx;GSi/#g{b;I\,rI"T

V$X4 SQL i/T{}Si/#

`XEn:

v Z 50 3D:Kc{;

GENROW Kc{

Kc{{:GENROW

m>:;vZC/},|IzIPDmx;9CNNm"w}rKc{Ddk#

GENROW I;E/wC4zI}]P(}g,INSERT odr;)*d;*,SD IN

PmzI}]P)#

*i4I GENROW /}zIDmD@F3FE",I+w|DZc#

`XEn:

v Z 50 3D:Kc{;

GRPBY Kc{

Kc{{:GRPBY

m>:y]8(Pr/}D+25TPxPVi#*zz;i5rT//}s5,K

YwGXhD#

148( GROUP BY P1,g{Z SELECT PmPP[//},rTI9C GRPBY

Kc{,8>14P[/1,+{vmw*%vi&m#

T\(i:

v KKc{m>;vXhDYw#*5MCJ=8I>,IQ"b&/PZ(e*V

iDP/Dd{Kc{(g(hM,S)O#

=< B. 4V83rEPD Visual Explain Kc{DPm 61

v *a_|,%v[//}x^ GROUP BY SdD SELECT odDT\,I"TB

PYw:

– TZ MIN(C) [//},4( C D}rw}#

– TZ MAX(C) [//},4( C D5rw}#

`XEn:

v Z 50 3D:Kc{;

HSJOIN Kc{

Kc{{:HSJOIN

m>:;v"P,S,ZC,S==B,TmPD^(PxP"P&m,TJm1S

,S,x;C$HTb)mDZ]Er#

1 FROM SdP}CK;9;vm1,,SGXhD#;*P;v,S=J9=v;

,mPDP`H,r"P,SMI\5V#b),S=Jh*_Pj+`,D}]`

M#"P,S2I\SXB`4DSi/Pzz,bk NLJOIN Div;y#

"P,S;h*+dkmEr#C,SGby4PD:(h"P,SDZ?m,;s

(}T,SP5xP"P&mxzI;viRm#;s|A!b?m,T,SP5x

P"P&m"lk*Z?mzIDiRm#

T\(i:

v 9C>X=J(4,}C;vmD=J)TuY*,SDPD}?#

v vsCErQsDs!,9dc;sTcZZfP]IC"PiRm#

v g{3FE";GnBD,r9C RUNSTATS |n|B|G#

`XEn:

v Z 50 3D:Kc{;

INSERT Kc{

Kc{{:INSERT

m>:+PekmP#

KKc{m>;vXhDYw#*5MCJ=8I>,IQ"b&/PZ(e*ek

DP/Dd{Kc{(g(hM,S)O#

`XEn:

v Z 50 3D:Kc{;

IXAND Kc{

Kc{{:IXAND


m>:T9C0/,;<1<uD`Xw}(hDa{y4PD0k1(AND)K

c#CKc{Jm+xPK0k1(AND)KcD=J&CZ`vw}T!?uYy

>mCJ#

4PKKc{T:

v ZCJy>m.0u!P/D6'#

v +&CZ`vw}D=JC0k1(AND)Kc,Z;p#

v +CZGM,SPDk,Sa{C0k1(AND)Kc,Z;p#

T\(i:


XB4(w}r_Xiw}4|}#

v g{3FE";GnBD,r9C runstats |n|B|G#

v (#,1;^(8P1w}(hnP'#*K@F^(PD}?,E/w9C=J

P}CDPDIC3FE"#g{3)5Hd{5vVC|51,r(}9C

RUNSTATS |nD WITH DISTRIBUTION Sd4ksV<3FE"G\X*D#

(}9CGyHV<3FE",E/wIxp51MG51vVD5#

v IZ*<M#9|G9C IXAND DX|,J IXAND nCIC%Pw}#

v TZGM,S,TB5mM`X,mP?vn_!qTP4(%Pw}#

`XEn:

v Z 50 3D:Kc{;

IXSCAN Kc{

Kc{{:IXSCAN

m>:(hw}TzzuYDPj6w#(hI9CI!D*</#9u~,rI&

CZ}Cw}PDIw}=J#

ZCJy>m(yZ=J)04PKYw4u!OqDPj6/D6'#

T\(i:


XB4(w}r_Xiw}4|}#

v 1CJ=vr`vm1,IT(}Tb?mD,SPa)w}Sx9(}w}CJ

Z?m|P'#

PXw}D|`8<,kND Visual Explain D*zoz#


v (#,1;PY}Pj6Oq1w}(hnP'#*K@FOqPj6D}?,E

/w9C=JP}CDPICD3FE"#g{3)5Hd{5vVC|51,r

(}9C runstats |nD WITH DISTRIBUTION Sd4ksV<3FE"G\X

*D#(}9CGyHV<3FE",E/wIxp51MG51vVD5#

`XEn:

v Z 50 3D:Kc{;


MSJOIN Kc{

Kc{{:MSJOIN

m>:O",S,dPb?MZ?mD^(P<Xk{O,S=J3r#O",S2

F*O"(h,SrErDO",S#

1 FROM SdP}CK;9;vm1,,SGXhD#;*P;v,S=J9=v;

,mDP`H1,O",SMGI\D#|9IIXB`4DSi/zz#

O",Sh*T,SPDPrdk,r*(#v(hm;N#(}CJw}rErm

IqCKPrdk#

T\(i:

v 9C>X=J(4,}C;vmD=J)TuY*,SDPD}?#


`XEn:

v Z 50 3D:Kc{;

NLJOIN Kc{

Kc{{:NLJOIN

m>:6W-7,S,C,STb?mD?;P(h;N((#P;vw}(h)Z

?m#

1 FROM SdP}CK;9;vm1,,SGXhD#6W-7,S;*sP,S=

J,+;cP;vra4PC|C#

I(}BPYw.;4P6W-7,S:

v *b?mD?vCJP(h{vZ?m#

v *b?mD?vCJPTZ?m4Pw}iR#

T\(i:

v g{Z?m(T>Z NLJOIN Kc{R_Dm)D,S=JPP;vw},r6W-

7,S\I\a|P'#liTi4Z?mG TBSCAN x;G IXSCAN#g{G,

r<GmSd,SPDw}#

m;V9,S|P'D(N*D)=(G4(b?m,SPDw}T9b?mP

r#


`XEn:

v Z 50 3D:Kc{;


PIPE Kc{

Kc{{:PIPE

m>:+P*Fxm;Kc{x;|DCP#

(KKc{vCZwT==#)

`XEn:

v Z 50 3D:Kc{;

RETURN Kc{

Kc{{:RETURN

m>:4TTC'Di/D}]5X#bGCJ=8<PDnUKc{,|T>CJ

=8\D[F5MI>#

KKc{m>;vXhDYw#

T\(i:


Vm#

`XEn:

v Z 50 3D:Kc{;

RIDSCN Kc{

Kc{{:RIDSCN

m>:(hS;vr`vw}qCDPj6(RID)Pm#

1"zBPiv1,E/wa<GKKc{:

v =J(} OR X|V,SrP;v IN =J#I9C;VF*w}0r1(OR)D

<u,C<u+,;mO`vw}CJDa{iOp4#

v 9C%vw}CJDPm$!\PC&,r*ZCJy>P.0ErPj6a9 I/O

|P'#

`XEn:

v Z 50 3D:Kc{;

RPD Kc{

Kc{{:RPD

m>:Z*O53P(}GX5M|0wCZS6L}]4lw}]DKc{#


g{Kc{|,D6L=8+;a;E/wli,rKKc{IE/w4<G#RPD K

c{r6LGX5}]4"Mlwi/a{Dks#CksIGX5M|0w(}9

C}]4'VD API zI#

`XEn:

v Z 50 3D:Kc{;

SHIP Kc{

Kc{{:SHIP

m>:*O53PC4S6L}]4lw}]DKc{#g{Kc{|,D6L=8

+;a;E/wli,rKKc{IE/w4<G#SHIP Kc{r6L}]4"MCZ

lwi/a{D SQL r XQuery SELECT od#SELECT odG9C}]4'VD

SQL r XQuery =TzID,RIT|,}]4yJmDNNP'i/#

`XEn:

v Z 50 3D:Kc{;

SORT Kc{

Kc{{:SORT

m>:ErYw,|+mPDP4Ud;vr`vPD3rEr,IT!q{}X4

n?#

1;Pw}IzcyksD3r,r_ErHw}(hI>|M1,ErGXhD#

;)yhPQCf,r_Z,SrVi.0*Er}],Er;c<Gw*nUYw

44PD#

g{P}\`,r_ErD}];\4P\@Yw,rCYwh*\_Dz[E\z

IY1m#

T\(i:

v <GmSErPDw}#


Vm#

v li53Y1mUdD$!s!Qc;,4,|;\ I/O ^F#(*libViv,

!qod –> T>3FE" –> mUd#)

v g{h*51Xsf#Er,I<GvsBPdCN}D5:

– ErQs!(sortheap)#*|DKN},R|%wXFPDPD}]b,;sS

|D/vK%P!qdC#SvVDJG>P!q0T\1!n(#

– ErQP5(sheapthres)#*|DKN},R|%wXFPDPD}]b5},

;sS/vK%P!qdC#SvVDJG>P!q0T\1!n(#


`XEn:

v Z 50 3D:Kc{;


TBSCAN Kc{

Kc{{:TBSCAN

m>:m(h(X5(h),|(}S}]31SA!yPXh}]4lwP#

1vVBPiv1,E/w!qK`(hx;Gw}(h:

v (hD5D6'51vV(4,XkCJs`}Dm)

v m\!

v w}/:HOM

v w};fZ

T\(i:

v 1m\s1,w}(hHm(h|P',r*s`}mP;P;CJ#*vsE/

wZbVivB9Cw}(hDI\T,I<GmSP!qT=JDPDw}#

v g{w}Q-fZ+4;9C,rliPXZ|D?v0<PD!q=J#g{b

)=J75fZ,rSB4liCw}D/:HGq;_#(*i4K3FE",I

r*ErBfDmD0m3FE"10Z,Y!q|Dw}4%TT>0w}3F

E"10Z#)

v limUdD$!s!Qc;,4,|;\ I/O ^F#(*libViv,!qod

–>T>3FE"–>mUd#)


V;}M_553FE"a)XZ=J!qTDE"#}g,b)3FE"+CZ

7(N1!qw}(hx;Gm(h#*|Bb)5,I9CxP W I T H

DISTRIBUTION SdD RUNSTATS |nTmxPYw#

`XEn:

v Z 50 3D:Kc{;

TEMP Kc{

Kc{{:TEMP

m>:+}]f"=Y1mPDYw,b)}]+Im;Kc{XA(I\G`N)#

Z&m SQL r XQuery odsa}%Cm(g{.04}%D0)#

*@@Si/rf"Pda{,KKc{GXhD#Z3)ivB(gI|Bod

1),|I\G?FTD#

`XEn:

v Z 50 3D:Kc{;

TQUEUE Kc{

Kc{{:TQUEUE


m>:mSP,1P`v}]bzmLr&mi/1,C|4+m}]S;v}]b

zmLr+]Am;v#1f0"PT1,9C`v}]bzmLr4&mi/#

mSP`M*:

v >X:mSPCZZ%vZcZD}]bzmLr.d+]}]#>XmSPCZ

VxZ"PT#

v G>X:mSPCZZ;,ZcOD}]bzmLr.d+]}]#

`XEn:

v Z 50 3D:Kc{;

UNION Kc{

Kc{{:UNION

m>:`vmDPwD"C#

KKc{m>;vXhDYw#*5MCJ=8I>,IQ"b&Q"b&/PZ(

eK*"CDP/Dd{Kc{(g(hM,S)O#

`XEn:

v Z 50 3D:Kc{;

UNIQUE Kc{

Kc{{:UNIQUE

m>:{}Z8(P_PX45DPb;Yw#

T\(i:

v v1ZJ1DPfZ(;w}1,KKc{E;GXhD#

PXw}D8<,kND Visual Explain D*zozPDZ Visual Explailn D*z

ozP 4(J1Dw}#

`XEn:

v Z 50 3D:Kc{;

UPDATE Kc{

Kc{{:UPDATE

m>:TmDPP}]D|B#

KKc{m>;vXhDYw#*5MCJ=8I>,IQ"b&/PZ(eK*|

BDP/Dd{Kc{(g(hM,S)O#

`XEn:

v Z 50 3D:Kc{;


XISCAN Kc{

Kc{{:XISCAN

m>:T%vi/=J4PKYw#(}ZCJy>m.0TNN`X*D XML }]

w}xP6'(h,ds5u!K5XDOqPj6/M XML Zcj6/D6'#9

Cw}ITa_i/DT\,r*`kw7(Gq9CT0gN9Cw}E"4jI

i/#b(#azzBPa{:

v 4D5TZcxPEr"}%NNX4n

v CfmP|,OqD5D?;P#

v T XML D54P XSCAN Yw#

}g,g{h*iRy> XML D5,NPPvDU*0Murphy1DyPKD{V,r

IC4Cf}7a{DP' XQuery od*:

db2-fn:column("EMPLOYEE.XMLCOL")/emp//name[last="Murphy"]/first

Y(zH0Q9CBPodTyPU4(KyZ XML }]Dw}:

CREATE INDEX empname on EMPLOYEE(XMLCOL)GENERATE KEY USING XMLPATTERN ’//name/last’

AS SQL VARCHAR(50)

i / ` k w I T ! q X I S C A N K c { 4 T i / x P s 5 , | + I C T B #

=:/emp//name/last,Kc{0=1M50Murphy1#w}+PzZlYR=kU

0Murphy1X*DZc#db2exfmt DdvzzDF.,N4p4gBy>:

RowsRETURN( 1)CostI/O|

6454.4NLJOIN( 2)

1.53351e+06189180/--+-\

6996.81 0.922477FETCH XSCAN( 3) ( 7)4091.76 218.587

266 27/---+---\

6996.81 210000RIDSCN TABLE: DB2XML( 4) TX3609.39

81|

6996.81SORT( 5)3609.34

81|

6996.81XISCAN( 6)3017.54


81|

210000XMLIN: DB2XML

TX_IDX

T\(i:


XB4(w}r_Xiw}4|}#

v 1CJ=vr`vm1,IT(}Tb?mD,SPa)w}Sx9(}w}CJ

Z?m|P'#


`XN<:

v Z 70 3D:XSCAN Kc{;

XSCAN Kc{

Kc{{:XSCAN

m>:KKc{CZ/@ XML ,NTT XPath mo=xPs5,"Zh*1i!D

5,N#KKc{&mI6k-7,SKc{(NLJOIN)+]DZc}C#|ZCJ

=8P;C1Sdkm>#

}g,<GTB XQuery od:

XQUERY for $i in db2-fn:xmlcolumn("MOVIES.XMLCOL")//actor return $i

db2exfmt 5CLr*Kodya)DCJ=8T>CZ&mD5Zc}CD XSCAN K

c{,b)D5Zc}CG(}Tm TELIAZ.MOVIES xPm(hlw=D#K>}P

D XSCAN Kc{5XZ TELIAZ.MOVIES.XMLCOL /OZR=D actor Zc}C#

RowsRETURN( 1)CostI/O|180

NLJOIN( 2)10137.91261/-+\

180 1TBSCAN XSCAN( 3) ( 4)21.931 56.2

1 7|180

TABLE: TELIAZMOVIES

`XEn:

v Z 50 3D:Kc{;


XANDOR Kc{

Kc{{:XANDOR

m>:T`vw}(hDa{xP XML }]w}0k1(AND)KP,CZT%Ni

/PD4S=JxPs5#CKc{Jm+xPK0k1(AND)KcD=J&CZ

`vw},T!?uYy>mCJ#

*K\;9C XANDOR Kc{,Xk{OBPu~:

v ;\9C;vH[=J#

v w}i/76P;P(d{#

v yP=J<CZ`, XML P#

g{OvNNu~;zc,r+!x9C IXAND Kc{#

}g db2exfmt $_yT>GyxPK`N XANDOR KcD XML }]w}(hDC

J=84p4gBy>:

RowsRETURN( 1)CostI/O|

0.00915933NLJOIN( 2)985.78998.9779/--+--\

2.96215 0.00309213FETCH XSCAN( 3) ( 11)340.113 217.976

19 27/---+---\

2.96215 210000RIDSCN TABLE: DB2XML( 4) TPCHX332.008

18|

2.96215SORT( 5)331.957

18|

2.96215XANDOR( 6)331.784

18+----------------+--------+-------+----------------+

355.62 6996.81 105000 105000XISCAN XISCAN XISCAN XISCAN( 7) ( 8) ( 9) ( 10)165.892 3017.54 1.6473e+06 851554

9 81 27768 14898| | | |


210000 210000 210000 210000XMLIN: DB2XML XMLIN: DB2XML XMLIN: DB2XML XMLIN: DB2XML

TPCHX_IDX TPCHX_IDX TPCHX_IDX TPCHX_IDX

?v XISCAN Kc{<4Pw}(h"* XANDOR Kc{a)OqD XML Zcj

6#XANDOR Kc{+&C0k1(AND)M0r1(OR)=J"5Xzci/D

XML #=D XML Zc#

T\(i:


XB4(w}r_Xiw}4|}#


v (#,1;^(8P1w}(hnP'#*K@F^(PD}?,E/w9C=J

P}CDPDIC3FE"#g{3)5Hd{5vVC|51,r(}+ WITHDISTRIBUTION Sdk RUNSTATS |ndO9C4ksV<3FE"G\X*D#

(}9CGyHV<3FE",E/wIxp51MG51vVD5#

`XEn:

v Z 50 3D:Kc{;


=< C. DB2 En

v }]b

v #=

v m

}]b

X5}]b+}]m>*mD/O#mI;iQ(eDPMNb}?DPiI#?v

mPD}]Z_-OG`XD,"RITZmkm.d(eX5#Iy]}'-mM

X5Kc(}g INSERT"SELECT M UPDATE)4i4M&m}]#

}|,}]Tb,}]b9|,dTma9Dhv,rK|_PThvT#||(;

i53?<m(b)mhv}]D_-Moma9);dCD~(||,k}]b`

X*DN}5)T0V4U>(|G<}ZxPDBqMITi5DBq)#

}]bITG>XDr6LD#>X}]bZomO;ZZ9CD$w>O,xm;

(zwOD}]br;O*G6LD#

`XEn:


#=

#=GC4T;i}]bTs(}g,m"S<"w}Mp{)xPViD(;j

6#4,g{*4({* PAYROLL Dm,rXkZ}]bPxPQw,TKbd{;

)C'GqQ4(,{Dm,bv}L%wQ1#?vTsD{FvZd#=Ph*

G(;D#

s`}}]bTsDTs{I=?ViI,Z;?VG#={F,Z~?VGTsD

{F#4(;vTs1,I+dVdxX(#=#g{;8(#=,r|;Vdx1

!#=,1!#=(#G4(CTsDK1DC'j6#}g,{* Smith DC'I\

_P{* SMITH.PAYROLL Dm#

#=2I*}]bPDTs#|D4(1dk#=PZ;vTsD4(1d`,##

=IT;vpKyP,xyP_ITXFT#=PD}]MTsDCJ#

`XEn:


m

X5}]b+}]m>*mD/O#mI_-EPDPMP}]((#F*G<)i

I#


?vm<P;v{F,xZ?vmP,?P<P;v{F#mDwP.d;,VX(

DEP3r,+G,I4IPPD57(D3r4TPxPlw#mPD}]G_-

`XD#yP}]bMm}]<;VdZmUdP#

`XEn:



=< D. d{E"v 4(w}D<r

v }1DCJ=8

v 9C runstats

4(w}D<r

4(J1Dw}9E/wITZw}(hHm(h|P'DG)ivB!qw}(

h#

4(w}D;)<r|(:

v ZJ1X=(ew|M(;w}#

v 4(XZi/C4,Sm(Join =J)DNNPDw}#

v 4(XZyZ#fy!SPQwX(5DNNPDw}#

v 4(XZ(#CZ ORDER BY SdPDPDw}#

v 7#9CKvlwzh*D}]D=J#}g,7#=JD!qT5m>h*5X

DG?Vm#

v 14(`Pw}1,w}DZ;P&C*i/PD=Jn#CDG;P#

v 7#w}lIDELM|B,$D*z;a+_#

`XEn:

v :w}DUd*s;(6\m8O:F.7)


`XNq:

v :@FmMw}DUd*s;(6\m8O:5)7)

}1DCJ=8

"4 STATS_TIME P8>4|B3FE"#

I\D-r

E/w9CDG1!5#(b)1!5kX|V0default1;pT>#)bVi

NI\<BCJ=8}1#

Yw (iz9C runstats |n4|B3FE";;sXBs(Lr|#

`XEn:

v Z 45 3D:CJ=8;



9C RUNSTATS

E/w9C4T}]bD?<m4q!XZ}]b"}]bPD}]?T0d{Xw

DE","9CKE"4!qCJ}]DnQ==#g{103FE";IC,rE

/wITy];<7D1!3FE"4!q;vM'DCJ=8#

?R(iz9C RUNSTATS |n4U/XZmMw}D103FE",Xp1TON

4P RUNSTATS |nT4Q-"zKXsD|Bn/rQ4(KBw}1#baxE

/wa)n<7DE"47(nQDCJ=8#

&7#Z|Bm.s9C RUNSTATS;qr,E/wI\aO*CmGUD#g{Z

0Kc{j8E"10ZODy}HZc,rKJb\wT#ZbVivB,jIm

D|B,XBKP RUNSTATS |n"XB4(\0lDmD5wlU#

"b:

v TIT(}i/CJDyPmMw}9C RUNSTATS#

v V;}M_553FE"7(}]N1V<;yH#*|Bb)5,I9CxP

WITH DISTRIBUTION SdD RUNSTATS TmxPYw#

v }K3FE".b,9Pd{rX(g^(PDEr"ms!T0:eXs!)I

\a0lgN!qCJ=8#

v ZKP RUNSTATS |nr|DdCN}.s,XkXBs(&CLr("I!qX

B5w|GDod)#

RUNSTATS |n(IZ DB2 CLP a>{&dk)ITa);,D3FE"6p,g

BPo(Py>:

y>3FE"

m: RUNSTATS ON TABLE m{

w}: RUNSTATS ON TABLE m{ FOR INDEXES ALL

mMw}:

RUNSTATS ON TABLE m{ AND INDEXES ALL

v?D3FE"

m: RUNSTATS ON TABLE m{ WITH DISTRIBUTION

w}: RUNSTATS ON TABLE m{ FOR DETAILED INDEXES ALL

mMw}:

RUNSTATS ON TABLE m{ WITH DISTRIBUTION AND DETAILED

INDEXES ALL

":ZTO?v|nP,m{XkC#={+^(#

`XEn:


`XN<:

v :RUNSTATS command;(Command Reference)


=< E. yw

IBM® I\;ZyPzRrXxa)>D5PV[Dz7"~qr&\XT#PXz1

0yZxrDz7M~qDE",krz1XD IBM zmI/#NNT IBM z7"

Lrr~qD}C"GbZw>r5>;\9C IBM Dz7"Lrr~q#;*;V

8 IBM D*6z(,NN,H&\Dz7"Lrr~q,<ITzf IBM z7"L

rr~q#+G,@@Mi$NNG IBM z7"Lrr~q,rIC'TP:p#

IBM +>I\Q5Pr}Zjkk>D5Z]PXDwn({#a)>D5"4ZhC

'9Cb)({DNNmI#zITCif==+mIi/Dy:

IBM Director of LicensingIBM CorporationNorth Castle DriveArmonk, NY 10504-1785U.S.A.

PX+VZ(DBCS)E"DmIi/,kkzyZzRrXxD IBM *6z(?E*

5,rCif==+i/Dy:

IBM World Trade Asia CorporationLicensing2-31 Roppongi 3-chome, Minato-kuTokyo 106, Japan

>un;JC"zrNNbyDunk1X(I;;BDzRrXx:International

Business Machines Corporation04V41a)>vfo,;=PNNV`D(^[Gw

>D9G5,D)#$,|(+;^Z5,DPXGV("JzMJCZ3VX(C

>D#$#3)zRrXxZ3);WP;Jmb}w>r5,D#$#rK>un

I\;JCZz#

>E"PI\|,<u=f;;<7DX=r!"ms#K&DE"+(Z|D;b

)|D+`k>JODBf>P#IBM ITf1T>JOPhvDz7M/rLrxP

DxM/r|D,x;mP(*#

>E"PTG IBM Web >cDNN}C<;G*K=cp{Ea)D,;TNN==

d1TG) Web >cD#$#G) Web >cPDJO;G IBM z7JOD;?V,

9CG) Web >cx4DgU+IzTPP##

IBM IT4|O*J1DNN==9CrV"zya)DNNE"x^kTzP#NN

pN#

>LrD;mI=g{*KbPXLrDE"To=gB?D:(i)JmZ@"4(

DLrMd{Lr(|(>Lr).dxPE";;,T0(ii)JmTQ-;;DE

"xP`%9C,kkBPX7*5:

IBM Canada LimitedOffice of the Lab Director8200 Warden AvenueMarkham, Ontario


L6G 1C7CANADA

;*qXJ1Du~Mun,|(3)iNBD;(}?D6Q,<IqCb=fD

E"#

>JOPhvDmILr0dyPICDmIJOyI IBM @] IBM M'-i"IBM

zJm~mI-irNN,H-iPDuna)#

K&|,DNNT\}]<GZ\X73PbCD#rK,Zd{Yw73PqCD

}]I\aPwTD;,#P)b?I\GZ*"6D53OxPD,rK;#$k

;cIC53OxPDb?a{`,#Kb,P)b?G(}Fcx@FD,5Ja

{I\aPnl#>D5DC'&1i$dX(73DJC}]#

f0G IBM z7DE"ISb)z7D)&L"dvf5wrd{I+*qCDJO

Pq!#IBM ;PTb)z7xPbT,2^(7OdT\D+7T"f]TrNNd

{XZG IBM z7Dyw#PXG IBM z7T\DJb&1rb)z7D)&La

v#

yPXZ IBM 44=rrbrDyw<If1|DrUX,x;mP(*,|Gvv

m>K?jMb8xQ#

>E"I\|,ZU#5qYwP9CD}]M(fD>}#*K!I\j{X5w

b)>},>}PI\a|(vK"+>"7FMz7D{F#yPb){F<Gi

9D,k5JL5s5yCD{FMX7DNNW,?tIO#

f(mI:

>E"I\|(4oTN=Dy>&CLr,b)y>5w;,Yw=(OD`L=

(#g{G*4UZ`4y>LrDYw=(OD&CLr`LSZ(API)xP&C

LrD*""9C"-zrV"*?D,zITNNN=Tb)y>LrxP4F"

^D"V",x^kr IBM 6Q#b)>}"4ZyPu~Bw+fbT#rK,IBM

;\##r5>b)LrDI?T"I,$Tr&\#

2b)y>LrD?]=4rdNN?VrNN\zz7,<Xk|(gBf(y

w:

©(s+>D{F)(j)#K?VzkGy] IBM +>Dy>Lr\zv4D#©

Copyright IBM Corp. (dkj]). All rights reserved.

Lj

DB2 f> 9 D5bDwvD5Pj6D+>"z7r~q{FI\G International

Business Machines Corporation rd{+>DLjr~qjG#PX IBM Corporation Z

@zM/rd{zRDLjDE"Z http://www.ibm.com/legal/copytrade.shtml P#

BPwnGd{+>DLjr"aLj,RQZ DB2 D5bPDAY;]D5P9C:

Microsoft®"Windows®"Windows NT® M Windows UjG Microsoft Corporation Z

@zM/rd{zRrXxDLj#


http://www.ibm.com/legal/copytrade.shtml

Intel®"Itanium®"Pentium® M Xeon® G Intel Corporation Z@zM/rd{zRrX

xDLj#

Java™ MyPyZ Java DLjG Sun Microsystems, Inc. Z@zM/rd{zRrX

xDLj#

UNIX® G The Open Group Z@zMd{zRrXxD"aLj#

Linux® G Linus Torvalds Z@zM/rd{zRrXxDLj#

d{+>"z7r~q{FI\Gd{+>DLjr~qjG#

=< E. yw 79

w}

[B]m

(e 73

mUd

(e 55

mPDw}

4(

ZVx}]b73P 40

[C]Yw}

(e 50

i/E/`

(e 53

Lr|

(e 52

4(

w} 75

[D]/, SQL r XQuery od

(e 49

[F]CJ=8

i/;xw}M3FE"

Z%;Vx}]b73P 12

ZVx}]b73P 30

4(d{w}

Z%;Vx}]b73P 24

ZVx}]b73P 40

TCZ,SmDP4(w}

Z%;Vx}]b73P 19

ZVx}]b73P 36

Dx

Z%;Vx}]b73P 11

ZVx}]b73P 29

Ev 45

}1 75

U/103FE"

Z%;Vx}]b73P 15

ZVx}]b73P 32

CJ=8< 46

A!{E 7

Es 8

|Db[ 10

CJ=8< (x)

q!|`j8E" 9

H05wD SQL r XQuery odDP

m 7

CJ=8<Zc 47

[H]PVi

kNDNjVi 48

[J]/:

(e 47

LL

Visual Explain 1

2, SQL r XQuery od

(e 55

[K]I5wod

(e 50

[M]|n

EXPLAIN.DDL 3

vesampl.ddl 3

#=

(e 73

[R]]w

(e 47

[S]}]b

(e 73

}]b\mDmUd

(e 48

5wm

4( 3

5wD SQL od

(e 50

5wD XQuery od

(e 50

5wlU

(e 49

/, SQL r XQuery od 5

2, SQL SQL r XQuery od 5

Visual Explain LL 3

w}

4( 75

[W]=J

(e 52

=JD!qT

(e 54

[X]53\mDmUd

(e 55

GM,S

(e 54

[Y]E/w

(e 52

NjVi

(e 48

k IBM *5 83

Kc{

(e 50

CMPEXP 59

DELETE 60

EISCAN 60

FETCH 60

FILTER 61

GENROW 61

GRPBY 61

HSJOIN 62

INSERT 62

IXAND 62

IXSCAN 63

MSJOIN 64

NLJOIN 64

PIPE 65

RETURN 65

RIDSCN 65

RPD 65


Kc{ (x)

SHIP 66

SORT 66

TBSCAN 67

TEMP 67

TQUEUE 67

UNION 68

UNIQUE 68

UPDATE 68

XANDOR 71

XISCAN 69

XSCAN 70

[Z]"b 77

CCMPEXP Kc{

hv 59

cost

(e 47

CREATE INDEX od

Ev 75

DDELETE Kc{

(e 60

EEISCAN Kc{

(e 60

EXPLAIN.DDL

|n 3

explsnap !n 5

FFETCH Kc{

(e 60

FILTER Kc{

(e 61

GGENROW Kc{

(e 61

GRPBY Kc{

(e 61

HHSJOIN Kc{

(e 62

IINSERT Kc{

(e 62

IXAND Kc{

(e 62

IXSCAN Kc{

(e 63

MMSJOIN Kc{

(e 64

NNLJOIN Kc{

(e 64

PPIPE Kc{

(e 65

RRETURN Kc{

(e 65

RIDSCN Kc{

(e 65

RPD Kc{

(e 65

runstats

9C 76

SSHIP Kc{

(e 66

SORT Kc{

(e 66

TTBSCAN Kc{

(e 67

TEMP Kc{

(e 67

timerons

XZ 56

TQUEUE Kc{

(e 67

UUNION Kc{

(e 68

UNIQUE Kc{

(e 68

UPDATE Kc{

(e 68

Vvesampl.ddl |n 3

Visual Explain

(e 56

CJ=8 45

CJ=8< 46

LL 1

XXANDOR Kc{

(e 71

XISCAN Kc{

(e 69

XSCAN Kc{

(e 70


k IBM *5

*kzyZzRrXxD IBM *5,ki4x7gBD IBM +r*5K?<:


*KbPX DB2 z7D|`E",kCJ http://www.ibm.com/software/data/db2/#



http://www.ibm.com/software/data/db2/udb/

��

Pz!"

S151-0455-00

visual explain lpublic.dhe.ibm.com/.../vr9/pdf/letter/nlv/zh_cn/db2tvc90.pdf · 2006-11-13 · 5d...

Documents