Applications of Batch Apex
Like any feature of Force.com, Batch Apex works best when you apply it to an appropriate use case that meshes well with its unique capabilities. The following list provides some guidelines when evaluating Batch Apex for your project:
Single database object—Batch Apex is optimized to source its data from a single, “tall” (containing many records) database object. It cannot read data from other sources, such as callouts to Web services. If the records you need to process span many database objects that cannot be reached via parent-child or child-parent relationships from a single database object, you should proceed carefully. ...
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