Updating database tables

A database is an abstraction on top of an operating system's file system to ease creating, reading, updating, and deleting persistent data.At a high level web applications store data and present it to users in a useful way.Databases are a concept with many implementations, including Postgre SQL, My SQL and SQLite.

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Databases make structured storage reliable and fast.

They also give you a mental framework for how the data should be saved and retrieved instead of having to figure out what to do with the data every time you build a new application.

These advanced features include but are not limited to: Typically web applications start with a single database instance such as Postgre SQL with a straightforward schema.

Over time the database schema evolves to a more complex structure using schema migrations and advanced features such as replication, sharding and monitoring become more useful as database utilization increases based on the application users' needs.

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