I have been working with messaging system at labs.9lessons.info, take a quick look at this post, how I have implemented database design tables and SQL queries. Mike Sherrill 'Cat Recall' 78.3k 16 16 gold badges 103 103 silver badges 156 156 bronze badges. Both columns would be foreign keys back to the Users table.This will show that Bob is friends with both Jon and Joe and that Jon is also friends with Joe. What to expect?How does a computer know which device is connected to the usb port?Can overfitting and underfitting occur simultaneously?Better derivation for the gravitational potential energy.Can a creature use legendary resistance to succeed against a scrying spell?Why is power of a signal equal to square of that signal?Help identifying possible dual pot light plug,TvöD contract E13 (limited contract 2 year) notice period.What causes a fuse to blow, the current or the power?How certain are we that we have not sent life to other planets/moons?Can I become a tenure-track prof in one dept (biology) and teach in a different dept (math) with only one PhD?Why do oscilloscopes have such high sampling rates when the bandwidth is low?Sudden stop of wet food diet is causing my cat to vomit.A wizard is magically engineering the perfect agriculture animal that will replace as many farm animals as possible, what is he making?I could not find anything on what software / DB they actually use for their cached graphs,TAO: Facebook's distributed data store for the social graph (ATC'13),F4: Facebook's warm BLOB storage system (OSDI'14). There are quite many reasons for using MYSQL for Facebook. When each photo is uploaded, Facebook stores as well as generate a total of four images which are of different sizes. 13. Implementing a social network is easy but making sure it performs well is clearly not - IMHO.I've started experimenting with OrientDB to do the graph-queries and mapping my edges to the underlying SQL DB. Why do you feel malfist is entitled to anything?Especially when it's a valid answer and is echoed by the other answers (although I didn't copy from them, when I answered, there where no answers). By using our site, you acknowledge that you have read and understand our.Stack Overflow for Teams is a private, secure spot for you and Like the one above? It supports different methods of storing and utilizing data. The obvious relationship is users connected via the "friend" relation to other users ("the social graph"), but edges can also be … But I'd also put some sort of non-composite identity as the PK with a nonclustered index. A highly interconnected network with a large number of users such as Facebook can only run effectively if it runs fully out of ram for the pages that are shown often. Marin Marin. your coworkers to find and share information.I have always wondered how Facebook designed the friend <-> user relation.I figure the user table is something like this:I figure the table with user's data (sex, age etc connected via user email I would assume).How does it connect all the friends to this user?Probably not. Or at least, maybe we don't know that we do.There are a lot of links on the first two articles that should give you some more insight.It's not possible to retrieve data from RDBMS for user friends data for data which cross more than half a billion at a constant time By using our site, you acknowledge that you have read and understand our.Stack Overflow for Teams is a private, secure spot for you and What does this mean for the future of AI, edge…,Hot Meta Posts: Allow for removal by moderators, and thoughts about future…,Goodbye, Prettify. How might facebook be handling this?I'll be highly grateful if somebody can provide me seom hints or pointers towards something like "How to Design a DB for Social Networking Website". Then you can keep data about the edges, like "day they became friends" and "approved status," etc.It's most likely a many to many relationship:The user table probably doesn't have user_email as a PK.Take a look at these articles describing how LinkedIn and Digg are built:There's also "Big Data: Viewpoints from the Facebook Data Team" that might be helpful:Also, there's this article that talks about non-relational databases and how they're used by some companies:You'll see that these companies are dealing with data warehouses, partitioned databases, data caching and other higher level concepts than most of us never deal with on a daily basis. add a comment | 3. This particular data is being circulated between their different data centers. The entire concept of voting on this site is for voting to be anonymous. On average, that is. @divo: clever use of indexes and partitions.While this certainly makes the most sense, I would think the performance would be horrendous given how many users Facebook has and how many friends each Facebook user has.Very interesting , thank you my friend. And the comment above this one doesnt make sense.No, the comment doesn't make sense. In worst case if I've 100 friends and suppose facebook has 101 shards, there is a possibility that each of my friend is in a different shard. As any FB user can easily understand, his/her profile is not simply a list of attributes such as name, email, interests and so on. 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