1.2 KiB
1.2 KiB
+++ noatcards = True isdraft = False +++
Database
_Source: Scaling up to your first 10 million users _
Relational database management system (RDBMS)
A relational database like SQL is a collection of data items organized in tables.
ACID is a set of properties of relational database transactions .
- Atomicity - Each transaction is all or nothing
- Consistency - Any tranaction will bring the database from one valid state to another
- Isolation - Excuting transactions concurrently has the same results as if the transactions were executed serially
- Durability - Once a transaction has been committed, it will remain so
There are many techniques to scale a relational database: master-slave replication, master-master replication, federation, sharding, denormalization, and SQL tuning.