Slowly Changing Dimensions-Informatica by Quontra Solutions
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Transcript of Slowly Changing Dimensions-Informatica by Quontra Solutions
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]lewly Mjdbhnbh Inagbsnebs
Srgsgbtgr?
Tuebtrd ]elutnebsNbferadtnmd Eblnbg Yrdnbnbh
Gadnl?nbfeCquebtrdselutnebs.mea
Mdll Ws?+4 939->33->>::
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Yepnms
Xjdt wgll sgg?
]MI nb IXJ
Xjy5
Xje5 Xjgb5
Jew5
Xg webt sgg?
]MI nb ELDS
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=
Xjy5
Lgts td`g ]dlgs fdmt tdklg fer gxdaplg
Gvgry idy aerg dbi aerg sdlgs td`g pldmg, jgbmg?
Aerg dbi aerg rews drg diigi te tjg fdmt tdklg
Vgry rdrgly drg tjg rews nb tjg fdmt tdklg upidtgi wntj mjdbhgs
Dlse Mebsnigr...
Jew wnll wg dioust tjg fdmt tdklg wjgb mjdbhgs drg adig5
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9
Xjy5 mebt
Mebsnigr tjg inagbsneb tdklgs
Meadprgi te tjg fdmt tdklgs, tjgy drg aerg stdklg dbi lgss veldtnlg
Jewgvgr, ubln`g fdmt tdklgs, d inagbsneb tdklg iegs bet mjdbhg oust
tjreuhj tjg nbmrgdsg ef buakgr ef rews, kut dlse tjreuhj mjdbhgste tjg dttrnkutgs tjgasglvgs
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7
Xje5 Xjgb5
Xje5
Fdmt tdklgs dbi Inagbsneb tdklgs
Xg wnll femus eb (]lewly Mjdbhnbh) Inagbsnebs
Xjgb5
Heei qugstneb?
Nbsnig tjg GYL premgss
Dftgr tjg GYL premgss, ds d stergi premgiurg
Bgvgr (wdnt, yeull sgg)
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6
Jew5
Yjns ns tjg knh qugstneb.
Frea wjdt wg insmussgi fer bew, wg mdb igrnvg tjgsg prnbmnplgs?
Aest inagbsnebs drg hgbgrdlly mebstdbt evgr tnag Adby inagbsnebs, tjreuhj bet mebstdbt evgr tnag, mjdbhg slewly
Yjg preiumt (kusnbgss) `gy ef tjg seurmg rgmeri iegs bet mjdbhg
Yjg igsmrnptneb dbi etjgr dttrnkutgs mjdbhg slewly evgr tnag
Nb tjg seurmg ELYS systga, tjg bgw vdlugs evgrwrntg tjg eli ebgs
Evgrwrntnbh ef inagbsneb tdklg dttrnkutgs ns bet dlwdys tjgdppreprndtg eptneb nb d idtd wdrgjeusg
Yjg wdys mjdbhgs drg adig te tjg inagbsneb tdklgs igpgbi eb
tjg typgs ef mjdbhgs dbi wjdt nbferadtneb aust kg prgsgrvgi nb
tjg IXJ
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Jew5 = Dbswgrs?
Yjg usudl mjdbhgs te inagbsneb tdklgs drg mldssnfngi nbte tjrgg typgs
Yypg 4
Yypg ;
Yypg =
Xg wnll mebsnigr tjg penbts insmussgi gdrlngr wjgb igmninbh wjnmj
typg te usg
Dlse Mebsnigr
Ie wg jdvg te usg tjg sdag typg fer tjg gbtnrg IXJ5
Fer tjg sdag inagbsneb5
Kgferg henbh eb, wg aust tdl` dkeut ebg aerg tjnbh.
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]urrehdtg @gy
D surrehdtg `gy ns d ubnqug nigbtnfngr fer tjg gbtnty nb tjg aeiglgi
werli
Nt ns be tigrnvgi frea dpplnmdtneb idtd
Nts bet agdbt te kg sjewb eutsnig tjg IXJ
Nts ebly snhbnfnmdbmg ns te dmt ds tjg prnadry `gy
Frgqugbtly nts d sgqugbtndl buakgr (]gqugbmgnb Erdmlg er
Nigbtnty nb ]TL ]grvgr)
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]urrehdtg @gy, mebt.
Jdvnbh tjg `gy nbigpgbigbt ef dll etjgr meluabs nbsuldtgs tjg
idtdkdsg rgldtnebsjnps frea mjdbhgs nb tjg idtd vdlugs er
idtdkdsg igsnhb (ad`nbh tjg idtdkdsg aerg dhnlg) dbi hudrgbtggs
ubnqugbgss
Fer gxdaplg? Db gapleygg NI ns mjesgb ds tjg bgutrdl (kusnbgss)
`gy ef db gapleygg IXJ. Kgmdusg ef d agrhgr wntj dbetjgr
meapdby, bgw gapleyggs frea tjg agrhgi meapdby aust kg
nbsgrtgi. Yjgrg ns ebg gapleygg wje wer`s nb ketj meapdbngs
Nf tjg `gy ns d meapeubi `gy, oenbnbh ns aerg gxpgbsnvg kgmdusgtjgrg drg aultnplg meluabs te meapdrg. ]urrehdtg `gys drg dlwdys
mebtdnbgi nb d snbhlg meluab
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Eur gxdaplgFer tjg igaebstrdtneb, wgll usg tjns stdr smjgad?
Erigr fdmt
Sreiumt @gyYnag @gy
Musteagr @gy
]dlgspgrseb @gy
Erigr Ielldrs
Mest IelldrsAdrhnb Ielldrs
]dlg Wbnts
Musteagr
Musteagr @gy
Musteagr Bdag
Musteagr Meig
Adrtndl ]tdtus
Diirgss]tdtg
_np
]dlgspgrseb
]dlgspgrseb @gy
]dlgspgrseb Bdag
Ygrrntery Bdag
[ghneb Bdag
Sreiumt
Sreiumt @gy
Sreiumt BdagSreiumt Meig
Sreiumt Lnbg
Krdbi
YnagYnag @gy
Idtg
Aebtj
Tudrtgr
^gdr
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Yypg 4 Mjdbhgs
Wsudlly rgldtg te merrgmtnebs ef grrers nb tjg seurmg systga
Fer gxdaplg, tjg musteagr inagbsneb? Anm`gy ]mjrgnkgr -2 An`y ]mjrgnkgr
Dlse Mebsnigr
Xjdt wnll jdppgb wjgb buakgr ef mjnlirgb ns mjdbhgi5
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Yypg 4 Mjdbhgs, mebt.
Hgbgrdl Srnbmnplgs fer Yypg 4 mjdbhgs?
Wsudlly, tjg mjdbhgs rgldtg te merrgmtneb ef grrers nb tjg seurmg systga
]eagtnags tjg mjdbhg nb tjg seurmg systga jds be snhbnfnmdbmg
Yjg eli vdlug nb tjg seurmg systga bggis te kg insmdrigi
Yjg mjdbhg nb tjg seurmg systga bggi bet kg prgsgrvgi nb tjg IXJ
Dlse Mebsnigr
Xjdt wnll jdppgb wjgb ebly tjg ldst vdlug kgferg tjg mjdbhg ns bggigi5
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Dpplynbh Yypg 4 mjdbhgs Evgrwrntg tjg dttrnkutg vdlug nb tjg inagbsneb tdklg rew wntj tjg bgw vdlug
Yjg eli vdlug ef tjg dttrnkutg ns bet prgsgrvgi
Be etjgr mjdbhgs drg adig nb tjg inagbsneb tdklg rew
Yjg `gy ef tjns inagbsneb tdklg er dby etjgr `gy vdlugs drg bet dffgmtgi
Gdsngst te naplgagbt
==47944;
Anm`gy ]mjrgnkgr
@4;=76
AdrrngiBghkd 44 ]Y
Musteagr @gy?
Musteagr Bdag?
Musteagr Meig?
Adrtndl ]tdtus?
Diirgss?
==47944;
An`y ]mjrgnkgr
@4;=76
AdrrngiBghkd 44 ]Y
Musteagr Meig?
@4;=76
Musteagr Bdag?
An`y ]mjrgnkgr
Kgferg Dftgr
@gy [gstrumturnbh
@4;=76 -2==47944;
Dlse Mebsnigr
Xjnmj nbigxgs wnll jglp jgrg5
Jew tjg mjdbhg kex wnll dppgdr nb tjg rgdl werli5
Mjdbhg Kex
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Yypg ; Mjdbhgs
Lgts lee` dt tjg adrtndl stdtus ef An`y ]mjrgnkgr
Ebg tjg IXJs rgqunrgagbts ns te trdm` erigrs ky adrtndl stdtus (nb diintneb te etjgr
dttrnkutgs)
Dll mjdbhgs kgferg 44/43/;339 wnll kg ubigr Adrtndl ]tdtus 1 ]nbhlg, dbi dll mjdbhgs dftgr
tjdt idtg wnll kg ubigr Adrtndl ]tdtus 1 Adrrngi
Xg bggi te dhhrghdtg tjg erigrs kgferg dbi dftgr tjg adrrndhg sgpdrdtgly
Lgts ad`g lnfg jdrigr?
An`y ns lnvnbh nb Bghkd st., kut eb =3/:/;33> jg aevgs te Dvnvna st.
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Yypg ; Mjdbhgs, mebt.
Hgbgrdl Srnbmnplgs fer Yypg ; mjdbhgs?
Yjgy usudlly rgldtg te trug mjdbhgs nb seurmg systgas
Yjgrg ns d bggi te prgsgrvg jnstery nb tjg IXJ
Yjns typg ef mjdbhg pdrtntnebs tjg jnstery nb tjg IXJ
Gvgry mjdbhg fer tjg sdag dttrnkutgs aust kg prgsgrvgi
Dlse Mebsnigr
Aust wg trdm` mjdbhgs fer dll tjg dttrnkutgs5
Fer wjnmj dttrnkutgs wnll wg trdm` mjdbhgs5 Xjdt drg tjg mebsnigrdtnebs5
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Dpplynbh Yypg ; mjdbhgs
==47944;
An`y ]mjrgnkgr
@4;=76
]nbhlgBghkd 44 ]Y
Musteagr @gy?
Musteagr Bdag?
Musteagr Meig?
Adrtndl ]tdtus?Diirgss?
74494;=9
An`y ]mjrgnkgr
@4;=76
AdrrngiBghkd 44 ]Y
Musteagr Meig?
@4;=76
Adrtndl ]tdtus(44/43/;339)?
Adrrngi
Diirgss (=3/:/;33>)?
Dvnvna st.
Kgferg Dftgr 44/43/;339
@gy [gstrumturnbh
@4;=76 -2 ==47944;
74494;=9
7;8:>=9;
7;8:>=9;
An`y ]mjrgnkgr
@4;=76
AdrrngiDvnvna st.
Dftgr =3/:/;33>
Dlse Mebsnigr
Xjdt wnll jdppgb nf nb diintneb te Diirgss wg dlse jdvg ]tdtg, znp meig5
Xjdt wnll jdppgb nf tjg musteagr meig wnll mjdbhg5
Mjdbhg Kex
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Yypg ; mebmluigi
Yjg stgps?
Dii d bgw inagbsneb tdklg rew wntj tjg bgw vdlug ef tjg mjdbhgi dttrnkutg
Db gffgmtnvg idtg wnll kg nbmluigi nb tjg inagbsneb tdklg
Yjgrg drg be mjdbhgs te tjg ernhnbdl rew nb tjg inagbsneb tdklg
Yjg `gy ef tjg ernhnbdl rew ns bet dffgmtgi Yjg bgw rew ns nbsgrtgi wntj d bgw surrehdtg `gy
Dlse Mebsnigr
Xjdt ns tjg idtd typg ef tjg gffgmtnvg idtg meluab5 Aust nt mebtdnb ketj idtg dbi tnag5Jew wnll tjg surrehdtg `gy kg kunlt5
Divdbtdhgs5 Insdivdbtdhgs5
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Yypg = Mjdbhgs
Bet meaaeb dt dll
Meaplgx qugrngs eb typg ; mjdbhgs ady kg
Jdri te naplgagbt
Ynag-mebsuanbh
Jdri te adnbtdnb
Xg wdbt te trdm` jnstery wntjeut lnftnbh jgdvy kurigb
Yjgrg drg adby seft mjdbhgs dbi wg iebt mdrg fer tjg fdr jnstery
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4>
Yypg = Mjdbhgs
Hgbgrdl Srnbmnplgs?
Yjgy usudlly rgldtg te seft er tgbtdtnvg mjdbhgs nb tjg seurmg systgas
Yjgrg ns d bggi te `ggp trdm` ef jnstery wntj eli dbi bgw vdlugs ef tjg mjdbhgs
dttrnkutg
Yjgy drg usgi te meapdrg pgrferadbmgs dmress tjg trdbsntneb
Yjgy prevnig tjg dknlnty te trdm` ferwdri dbi kdm`wdri
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;3
Dpplynbh Yypg = mjdbhgs
4;=97
Kerns @dv`dz
(bull)
[ddbdbd4/4/4>>:
]dlgspgrseb @gy?
]dlgspgrseb Bdag?
Eli Ygrrntery Bdag?
Murrgbt Ygrrntery Bdag?Gffgmtnvg Idtg?
]dlgspgrseb NI?
[]4>>834
Ygrrntery Bdag?Bgtdbyd
(4;/4/;333)
Kgferg Dftgr
@gy [gstrumturnbh
[]4>>834 -2 4;=97
Dlse Mebsnigr
Xjdt ns tjg gffgmtnvg idtg kgferg tjg mjdbhg5
Mdb tjg eli tgrrnrety meluab mebtdnb bull5 Xjdt dkeut tjg murrgbt tgrrntery5
4;=97
Kerns @dv`dz[ddbdbd
Bgtdbyd4;/4/;333
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;4
Yypg = mebmluigi
Be bgw inagbsneb rew ns bggigi
Yjg gxnstnbh qugrngs wnll sgdalgssly swntmj te tjg murrgbt vdlug
Dby qugrngs tjdt bggi te usg tjg eli vdlug aust kg rgvnsgi dmmerinbhly
Yjg tgmjbnqug wer`s kgst fer ebg seft mjdbhg dt d tnag
Nf tjgrg ns d summgssneb ef mjdbhgs, aerg sepjnstnmdtgi tgmjbnqugs aust kg divnsgi
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;;
Yjgrgs gvgb aerg
Yypg 3 mjdbhgs
Yypg 9usnbh jnstery tdklgs
Yypg 6Jykrni (wjdt dkeut 75)
Yypg 6Dltgrbdtnvg naplgagbtdtneb
]MI nb ELDS
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;=
Mebmlusnebs
= Adnb wdys ef jnstery trdm`nbh
Mjeesg tjg wdy yeui ln`g fer gvgry inagbsneb tdklg
^eu ady meaknbg tjg typgs
Nt dll igpgbis eb tjg systgas rgqunrgagbts
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;9
Knklnehrdpjy
Idtd Xdrgjeusnbh Fubidagbtdls, Sdulrdo Sebbndj, Oejb
Xnlgy Suklnmdtneb
Xn`npgind (]lewly Mjdbhnbh Inagbsneb)
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;7
Tugstnebs5
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;6
Yjdb` yeu