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Apex Cursor + Queueable Tutorial
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Apex cursors provide a powerful solution for handling large datasets in Salesforce while avoiding common limitations like query row limits and callout restrictions. Instead of retrieving all records at once, Apex cursors allow you to fetch and process data in smaller, manageable chunks.
Why Use Apex Cursors?
- Handle Large Datasets: Process up to 50 million records, bypassing the 2,000-row SOQL limit.
- Avoid Parallel Issues: Execute sequentially, reducing complexity with third-party rate limits.
- Flexible Processing: Customize fetch sizes and iterate through records without hitting governor limits.
Key Features
- Use
Database.getQueryLocatorto initialize cursors for large queries. - Retrieve records in chunks with
fetch(), making it easier to stay within callout and system limits. - Process data iteratively without the overhead of parallel batch executions.
Apex cursors are an essential tool for developers who need efficient, scalable data handling in Salesforce.
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