PostgreSQL Internal Architecture
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Client Backends
Query Planning
Query Execution
Shared Buffers
SLRU Caches
Postmaster Process
Background Workers
VACUUM
Indexes Usage
Tables Usage
Buffer IO & Statistics Subsystem
Write-Ahead Log (WAL)
Logger Process
Replication
WAL Sender
WAL Archiver
Background Writer
Checkpointer Process
Network Layer
Storage System
WAL Receiver Process
Recovery Process
Tables / Indexes Data Files & Tablespaces
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