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Database Sharding & Read-Replicas for High-Traffic Web Apps: Scaling PostgreSQL & MySQL to 100k QPS (2026)

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SRIT Database Architecture Lab Principal Database Systems Architect
13 min read
Database Sharding & Read-Replicas for High-Traffic Web Apps: Scaling PostgreSQL & MySQL to 100k QPS (2026) - SRIT Creations
Topics: #Database Sharding #PostgreSQL #MySQL #High-Traffic Scaling #PgBouncer #Database Architecture #SRIT Creations #Database Consulting

Key Takeaways & Executive Summary

When web applications scale to millions of active users, monolithic database servers hit physical I/O bottlenecks. Discover how enterprise architects implement read-write splitting, declarative table partitioning, PgBouncer pooling, and distributed sharding to scale PostgreSQL effortlessly.

Target Industry: /services
Architecture: Cloud-Native, High Availability
Implementation: 2-4 Week Rapid Deployment
Code Ownership: 100% Full IP & Source Code

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Database bottlenecks are the #1 cause of application slowdowns and crashes during high-traffic surges. While application servers can scale horizontally with ease, scaling stateful relational databases requires disciplined Database Sharding, Read-Replica Routing, and Connection Pooling.

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Frequently Asked Questions

What is the difference between Read-Replicas and Database Sharding?

Read-Replicas copy data from a primary write database to multiple read-only nodes, offloading heavy `SELECT` queries. Database Sharding horizontally splits table rows across separate physical database servers using a shard key (like `tenant_id` or `user_id`), allowing unlimited write scaling.

Why is connection pooling with PgBouncer mandatory for high concurrency?

Each PostgreSQL connection consumes 5MB to 10MB of server RAM and spawns an OS process. PgBouncer maintains a small pool of reusable backend connections, allowing 10,000 incoming app connections without crashing the database.

How does declarative table partitioning speed up time-series queries?

By partitioning large tables by month or year, queries scanning recent dates only read the relevant small sub-table partition, bypassing hundreds of millions of historical rows.

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