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Cum sa sincronizam mai multe baza de date SQL Azure - Data Sync Service

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Uneori avem nevoie de un mecanism prin care sa putem sincroniza una sau mai multe baza de date SQL Azure. Putem sa încercam sa scriem cod prin intermediul căruia sa ne sincronizam bazele de date din același data center sau din data center-uri diferite.
O alta soluție la îndemîna este Data Sync Service. Prin intermediul acestui mecanism putem sa ne sincronizam doua sau mai multe baza de date din cloud fara sa fie nevoie sa scriem nici o linie de cod. Nu mai este nevoie sa reinventam roata din nou.
De exemplu dacă avem 2 baze de date în norișor, una în Europa și alta în Asia pe care trebuie sa le sincronizam bidirecțional putem sa folosim cu încredere acesta soluție. Orice modificare făcuta într-o baza de date se va face în mod automat și în cealaltă baza de date din celalalt data center.
Nivelul de granularitate dupa care se poate face filtrarea in acest moment este tabela. Putem sa setam ca una sau mai multe tabele sa fie sincronizate. Din fericire in cazul in care acelasi continut este modificat in doua tabele sincronizate, Data Sync Service poate sa rezolve singur aceasta problema si sa faca handling la aceste probleme intr-o oarecare masura.
Sincronizare se poate face doar la o parte din tabele( mai putini bani). Se poate face un schedule pentru momentul cînd se dorește sa se facă sincronizarea( granularitatea este la nivel de ora). O alta varianta de sincronizare este la cerere.
Opțiunea de sincronizare bi-direcționala este cu doua tăișuri. Aceasta ne permite sa tinem doua sau mai multe baza de date sincronizate in orice moment. O modificare care se face intr-o baza de date( intr-un hub), se propaga aproape instantaneu si la restul bazelor de date. Din pacate varianta de Sync Framework care este pentru cloud nu permite sa facem handling la conflicte. In acest caz trebuie sa avem grija la modul in care generam primary key-urile.
Pentru mai multe informatii http://social.technet.microsoft.com/wiki/contents/articles/sql-azure-data-sync-overview.aspx
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