💬 In plain words: Batch Apex is the heavy-duty freight train for processing millions of Salesforce records. It grabs a massive query, chops it into smaller chunks (default is 200 records), and processes them piece by piece. Because each chunk gets a fresh set of governor limits, you can safely update massive datasets. When volume is the problem, Batch Apex is the solution. 📌 The 4 Million Customer Example: Imagine you need to recalculate loyalty points for 4 million customers. Batch Apex queries them all at once (using a QueryLocator to stream up to 50 million rows safely) and processes them 200 at a time. That creates 20,000 mini-transactions, each with its own limits. If chunk #47 encounters an error and fails, the other 19,999 chunks will still commit successfully. 🎬 Real-Life Application: 3 Million Rows Before Breakfast A sudden price change means you need to recalculate the fuel surcharge on 3 million Delivery records overnight. ...
Salesforce Basics