Decrement value MongoDB, prevent negative number
I'm using MongoDB and I have a document where I want to increment a count field. However, I need to ensure that this count does not go below zero. For example, if inc is -2 and the current count is…
How to set redis list values atomically?
I'd like to atomically set all values of a list, just like the regular SET command. I need it because the list is to be a cached representation of a database query. I'd like to access the cache in the…
Will AWS S3 reject a read during an object being updated? – Amazon Web Sevices
I read S3 doc that PUT is atomic, in the sense there is never a partial write to an object. My naive intuition is that, there might be some underlying locking mechanism that assures the atomicity. Does that mean that…
Postgresql – Is there a way to ensure that inserts do not happen until after all data is collected for that row?
Brief I'm getting inserts into a transactions log table out of desired (logical) order - where a deposit to a an accountinstance+iteration occurs before that iteration exists, logically. Technology We're using PostgreSQL (13.x). Background I'm writing code that must be…