Amazon SimpleDB BatchDelete
We just added a new BatchDeleteAttributes call to Amazon SimpleDB and you can read all about it in the SimpleDB Developer Guide. This new call will make it easier and quicker for you to delete multiple attributes or multiple items with one request. SimpleDB processes this call more efficiently than it does a series of DeleteAttribute calls, and you’ll also reduce the number of requests. You can delete up to 25 attributes or items per call, and you can issue multiple calls in parallel if you are running in a threaded environment.
PS – I’m going to make good use of this call myself. Over a year ago I started a little data collection project on the side and promptly forgot about it. I created several new SimpleDB items every minute and now I have 7 or 8 million of them.