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Just so, how do I use bulk API in Salesforce?

The Salesforce Bulk API allows you to quickly load your organization's data into Salesforce from CSV or XML files. To use the Bulk API, you first create a job which results in a job ID. Then you add one or more batch to the job, identified by the Job ID. The result for each batch is a Batch ID.

Also, what is bulk API in data loader? The Bulk API is optimized to load or delete a large number of records asynchronously. It is faster than the SOAP-based API due to parallel processing and fewer network round-trips. By default, Data Loader uses the SOAP-based API to process records.

Considering this, how do I bulk load data in Salesforce?

Walkthrough for Bulk Insert

1. Create a CSV file containing your data. Using your preferred spreadsheet tool, create a CSV file that contains the records you want to insert.
2. Create a job. To do any Bulk API 2.0 task, such as inserting or updating records, you first create a job.
3. Upload your CSV data.
4. Close the job.
5. Check the job status and results.

What is default batch size if we enable bulk API?

The default batch size in Data Loader is 200 or, if you select "Enable Bulk API", the default batch size is 2,000.