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Intrebare despre graphuri si datele prelucrate

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Ca sa ai un graph asa cum se presupune ca e la facebook, cu date, cu tot, datele sunt stocate intr-o baza de date MySql si accesate la nevoie de graph sau se afla in graph "on the fly" fara a fi stocate intr-o baza de date ?

In cazul in care graphul acceseaza datele dintr-o baza de date, nu se pierde mai mult timp decat daca ar fi luate pur si simplu din baza de date cu MySQL syntax ?

Nu se poate construi o baza de date MySql care sa simuleze practic ceea ce face si graphul ? Si daca se poate, de ce nu se face asa si se prefera "graph algorithm" in locul unei baze de date obisnuite ?

Va rog sa ma lamuriti si pe mine cu aceste probleme fiindca nu prea am inteles cum sta treaba.

Multumesc anticipat !

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