triennale-appunti-steffo/docs/route-BasiDiDati.chunk.33463.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,Q(B||(B=j`
                            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(_.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,Q(S||(S=j`
                            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,Q(V||(V=j`
                            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,Q(M||(M=j`
                            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,Q($||($=j`
                            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,e("hosL").h)},TWV3:function(l,n,e){"use strict";(function(l){var t=e("htlC"),i=e.n(t);n.a=function(n){let e;return e=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},e))}}).call(this,e("hosL").h)},UEzA:function(l,n,e){"use strict";(function(l){var t=e("zDbI");n.a=function(n){return l("p",null,l(t.a,null,n.children))}}).call(this,e("hosL").h)},UrZR:function(l){l.exports={red:"red__2hgQp",orange:"orange__tGLf9",yellow:"yellow__15oHB",lime:"lime__DGxfH",cyan:"cyan__d6Sml",blue:"blue__4v0nZ",magenta:"magenta__3H2kV",tablepanel:"tablepanel__1Wil3"}},Wxxq:function(l,n,e){"use strict";(function(l){var t=e("3duz"),i=e.n(t);e("hosL"),n.a=function(n){return l("div",{class:i.a.example},n.children)}}).call(this,e("hosL").h)},Y9Ml:function(l,n,e){"use strict";(function(l){var t=e("8uYk"),i=e.n(t);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 e=o.DEFAULT;return n.color&&(e=n.color),l("div",{class:i.a.box+" "+e},n.children)}}).call(this,e("hosL").h)},e8JA:function(l){l.exports={red:"red__3683f",orange:"orange___PVUv",yellow:"yellow__CS7Ak",lime:"lime__3bqTp",cyan:"cyan__3UE2X",blue:"blue__2n3Ng",magenta:"magenta__1M1Vw",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={red:"red__YF6Vb",orange:"orange__2w5to",yellow:"yellow__XvcrZ",lime:"lime__2MtRd",cyan:"cyan__36T9w",blue:"blue__1l1tt",magenta:"magenta__2SE7I",splitparent:"splitparent__3-wBs",splitchild:"splitchild__begkX"}},imVn:function(l,n,e){"use strict";(function(l){var t=e("OmdA"),i=e.n(t),o=e("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,e("hosL").h)},wQ73:function(l,n,e){"use strict";var t=e("hosL");n.a=Object(t.createContext)(!0)},yDBo:function(l,n,e){"use strict";(function(l){var t=e("Q7TX");n.a=function(n){return l(t.b,{inline:!0,display:t.a.INLINE},n.children)}}).call(this,e("hosL").h)},zDbI:function(l,n,e){"use strict";(function(l){var t=e("Q7TX");n.a=function(n){return l(t.b,{inline:!1,display:t.a.BLOCK},n.children)}}).call(this,e("hosL").h)}}]);
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