triennale-appunti-steffo/docs/route-BasiDiDati.chunk.834ae.esm.js

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                            C = {\color{yellow} {C_{indice}}} + {\color{Orange} C_{relazione}}
                        `))),l("p",null,"Per accedere attraverso un indice a una specifica tupla della relazione, si spenderà:"),l(s.a,null,M(B||(B=W`
                            C = {\color{yellow} 1} + {\color{Orange} 1}
                        `))),l("p",null,"Se le tuple a cui si vuole accedere sono più di una, allora, il costo dipenderà da se l'indice è clustered o non-clustered."),l(d.a,null,"Nel calcolo del costo di una query, si considerano tutti i cambi di pagina come ",l("b",null,"page fault"),"."),l("p",null,"Per gli indici ",l("b",null,"clustered"),", visto che basta caricare in memoria i blocchi in sequenza, il costo sarà:"),l(s.a,null,M($||($=W`
                            C = {\color{yellow} ( F \cdot N_{foglie} ) } + {\color{Orange} ( F \cdot N_{blocchi} ) }
                        `))),l("p",null,"Per gli indici ",l("b",null,"unclustered"),", per i quali potremmo dover caricare e rimuovere lo stesso blocco dalla memoria più volte, il costo sarà:"),l(s.a,null,M(S||(S=W`
                            C = {\color{yellow} ( F \cdot N_{foglie} ) } + {\color{Orange} ( F \cdot N_{tuple} ) }
                        `))),l("p",null,"Se si stanno effettuando query su più indici unclustered, il costo sarà:"),l(s.a,null,M(V||(V=W`
                            C = {\color{yellow}\sum_k ( F_k \cdot N_{foglie_k} )} + {\color{Orange} \left( \prod_k F_k \cdot N_{tuple} \right)}
                        `)))),l(o.a,{title:"Costo di join"},l("p",null,"Quante ",l("i",null,"unità di lavoro")," costa effettuare un join tra due relazioni."),l("p",null,"Varia in base al metodo di join utilizzato."),l("p",null,"Utilizzando il metodo del ",l("b",null,"nested loop"),":"),l(s.a,null,M(j||(j=W`
                            C_{1 \times 2} = C_1 + ( N_{selezionati_1} \cdot C_2 )
                        `))),l("p",null,"La scelta della colonna su cui iterare è quindi importante!"))))}}}.call(this,t("hosL").h)},TWV3:function(l,n,t){"use strict";(function(l){var e=t("htlC"),i=t.n(e);n.a=function(n){let t;return t=Array.isArray(n.children)?n.children.map(n=>l("div",{class:i.a.splitchild},n)):l("div",{class:i.a.splitchild},n.children),l("div",{class:i.a.split},l("div",{class:i.a.splitparent},t))}}).call(this,t("hosL").h)},UEzA:function(l,n,t){"use strict";(function(l){var e=t("zDbI");n.a=function(n){return l("p",null,l(e.a,null,n.children))}}).call(this,t("hosL").h)},UrZR:function(l){l.exports={tablepanel:"tablepanel__1Wil3"}},Wxxq:function(l,n,t){"use strict";(function(l){var e=t("3duz"),i=t.n(e);t("hosL"),n.a=function(n){return l("div",{class:i.a.example},n.children)}}).call(this,t("hosL").h)},Y9Ml:function(l,n,t){"use strict";(function(l){var e=t("8uYk"),i=t.n(e);const o=Object.freeze({RED:i.a.red,ORANGE:i.a.orange,YELLOW:i.a.yellow,LIME:i.a.lime,CYAN:i.a.cyan,BLUE:i.a.blue,MAGENTA:i.a.magenta,DEFAULT:i.a.default});n.a=function(n){let t=o.DEFAULT;return n.color&&(t=n.color),l("div",{class:i.a.box+" "+t},n.children)}}).call(this,t("hosL").h)},e8JA:function(l){l.exports={timer:"timer__3Z2pL",days:"days__myhe2",hours:"hours__3JUDn",minutes:"minutes__24lD7",seconds:"seconds__2vZ4f",count:"count__chi9X",text:"text__34ldC",unknown:"unknown__3sT2P",expired:"expired__zNiuP"}},htlC:function(l){l.exports={splitparent:"splitparent__3-wBs",splitchild:"splitchild__begkX"}},imVn:function(l,n,t){"use strict";(function(l){var e=t("OmdA"),i=t.n(e),o=t("Y9Ml");n.a=function(n){return l(o.a,{color:n.color},l("h3",{class:i.a.title},n.title),l("div",{class:i.a.contents},n.children))}}).call(this,t("hosL").h)},wQ73:function(l,n,t){"use strict";var e=t("hosL");n.a=Object(e.createContext)(!0)},yDBo:function(l,n,t){"use strict";(function(l){var e=t("Q7TX");n.a=function(n){return l(e.b,{inline:!0,display:e.a.INLINE},n.children)}}).call(this,t("hosL").h)},zDbI:function(l,n,t){"use strict";(function(l){var e=t("Q7TX");n.a=function(n){return l(e.b,{inline:!1,display:e.a.BLOCK},n.children)}}).call(this,t("hosL").h)}}]);
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