# Best practices for using bulk data operations in DynamoDB
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DynamoDB supports batch operations such as `BatchWriteItem` using which you can perform up to 25 `PutItem` and `DeleteItem` requests together. However, `BatchWriteItem` doesn't support `UpdateItem` operations. When it comes to bulk updates, the distinction lies in the requirements and the nature of the update. You can use other DynamoDB APIs such as `TransactWriteItems` for batch size up to 100. When more items are involved, you can use services such as AWS Glue, Amazon EMR, AWS Step Functions, custom scripts and tools like DynamoDB-shell, or the open-source Bulk Executor for DynamoDB for bulk updates.

**Topics**
+ [Conditional batch update](BestPractices_ConditionalBatchUpdate.md)
+ [Efficient bulk operations](BestPractices_EfficientBulkOperations.md)