What is the Postgres Architecture, explain it in depth.

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Postgres Architecture is a client-server model with a multi-process approach.

Postgres uses a multi-process approach with a master process and worker processes.
The master process manages shared memory and worker processes handle client connections.
Postgres also has a background process for maintenance tasks and a WAL writer for data durability.
Postgres supports ACID transactions and has a query planner for optimizing queries.
Postgres also has a storage manager for managing disk space and a buffer manager for caching data.
Postgres can be extended with user-defined functions and custom data types.
Postgres also supports replication and high availability through streaming replication and logical replication.

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