What is Batch APEX?
Batch APEX is a way to run code in a batch in Salesforce.com. It can be scheduled or called to run asynchronously. Batch APEX has three primary asynchronous methods: Start(), Execute(), and Finish() that handle all of the processing in the batch.
Batch APEX also provides a way to query the status of a Batch using both Visual Force an in the UI in Setup. It's a great way to handle mass data updates of up to 50 million records at a time.
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