Force.com Data Definition and Storage
Rather than attempting to manage a vast, ever-changing set of actual database structures on behalf of each application and tenant, the Force.com storage model manages “virtual” database structures using a set of metadata, data, and pivot tables, as illustrated in Figure 4.
Figure 4. Force.com’s data definition and storage model consists of a set of metadata, data, and pivot tables that allow for functional access to the actual data of “virtual” tables.
When organizations create custom application objects (i.e., custom tables), the UDD keeps track of metadata concerning the objects, their fields, relationships, ...
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