What is the structure of Facebook database?

Facebook stores majority, if not all, of users’ data, such as profiles, friends, posts and comments, inside a single giant social graph. There are two elements inside a social graph, nodes and edges. A node represents an entity, such a user, a post, a comment and a location.

How many databases does Facebook have?

Facebook uses more than 1000 MySql servers to keep the data (it’s so called universal (multi tenant) database). The database is heavily sharded and replicated. Related data is kept together in a shard to reduce the number of shards they need to hit to find the data. They also have a lot of binlog consumers.

How does Facebook store their data?

They grow by millions of events (inserts) per second and process tens of petabytes and hundreds of thousands of queries per day. The three data stores used most heavily are: 1. ODS (Operational Data Store) stores 2 billion time series of counters.

What kind of database modeling technique is represented by Facebook?

Given the data modeling flexibility of SQL and the ubiquity of MySQL when FB started, this social graph was initially built as a PHP application powered by MySQL as the persistent database and memcache as a “lookaside” cache.

Is Facebook SQL or NoSQL?

NoSQL database systems are distributed, non-relational databases that also use non-SQL language and mechanisms in working with data. NoSQL databases can be found in companies like Amazon, Google, Netflix, and Facebook that are dependent on large volumes of data not suited to relational databases.

What is the size of Facebook database?

Facebook generates 4 petabytes of data per day—that’s a million gigabytes. All that data is stored in what is known as the Hive, which contains about 300 petabytes of data.

What type of storage does Facebook use?

While the industry has moved on to 6 TB and 8 TB drives, Facebook is still using 4 TB drives, for a total of 120 TB per Knox array. Facebook partitions the nine Knox storage array into two slices, with 15 drives allocated to each of the 18 Leopard nodes.

How does Facebook use MySQL?

At Facebook we use MySQL to manage many petabytes of data, along with the InnoDB storage engine that serves social activities such as likes, comments, and shares.

Does Facebook use NoSQL database?

What is Facebook data?

Facebook’s user data extends far beyond the basic biographical information that most share. Facebook also tracks users on other sites and apps, collects so-called biometric facial data and allows marketers to target people who express an interest in certain health conditions.

What is entity in DBMS?

Overview. An entity in DBMS (Database management System) is a real-world thing or a real-world object which is distinguishable from other objects in the real world. For example, a car is an entity. An attribute of an entity gives us information about the characteristic features of an entity.

Where is Facebook data physically stored?

The company’s first cloud campus in Prineville, Oregon features its largest deployment of servers, with plans for nine data center buildings and 4.6 million square feet of capacity. Facebook also has some of its largest concentrations of IT infrastructure in the Midwest, with plans for 4.1 million square feet of data …

Where does Facebook keep its servers?

And, again, this was just for the original data center. Facebook now has a total of four giant buildings in Forest City, all full of whirring, humming servers that run all day, every day. Facebook’s data center in Forest City, North Carolina, via Google Maps.

How does Facebook use MongoDB?

When a user logs in, Facebook provides MongoDB Realm with an OAuth 2.0 access token for the user. Realm uses the token to identify the user and access approved data from the Facebook API on their behalf. For more information on Facebook Login, see Facebook Login for Apps .

What is a Facebook data center?

Facebook’s global portfolio of data centers power the company’s apps and services, including Facebook, Instagram, Messenger, and WhatsApp, enabling communications and sharing between billions of people around the world.

Does Facebook use Hadoop?

Facebook said it uses Hadoop technology to capture and store billions of pieces of content generated by its members daily. The data is analyzed using the open source Apache Hive data warehousing tool set.

What kind of database does Facebook use?

Facebook’s database is based on MySQL database. It is obviously not possible for a MySQL database to serve tens of petabytes of data. Facebook made two modifications to the database Facebook partitions the objects and associations into logical shards. Each database instance will host one shard.

How many database tables does Facebook use for its graph?

Surprisingly, Facebook uses only two database tables to represent the social graph that captures the activities of its one billion users, object table and association table. In the following sections, object and node mean the same thing.

What data is stored on Facebook?

Facebook stores majority, if not all, of users’ data, such as profiles, friends, posts and comments, inside a single giant social graph. There are two elements inside a social graph, nodes and edges. A node represents an entity, such a user, a post, a comment and a location.

What is MyRocks DB in Facebook?

Facebook developed a new storage engine, MyRocks DB, based on Log Structure Merge (LSM) tree. It helped reduced storage usage by 50% and reduced database latency. MyRocks DB is an involved topic and I will write a separate blog for it.