MySQL Composite Index Column Order for Filtered and Sorted Queries
In a MySQL composite index, put columns used in equality conditions first, then the column used for sorting or range filtering. The index is usable from its...
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MySQL Transaction Isolation Levels Trade Offs for Web Applications
MySQL InnoDB defaults to REPEATABLE READ, which suits most web applications because it gives each transaction a consistent snapshot of the data. READ COMMITTED...
Linux Swap and OOM Killer Behavior on Memory Constrained Servers
On a memory constrained Linux server, swap gives the kernel breathing room by moving rarely used pages to disk, while the OOM killer is the last resort that...
Docker Secrets Mounts vs Environment Variables in CI Deployments
Secrets in environment variables can leak through diagnostics and process inspection. Production workloads require a defined contract for latency, correctness,...
Git Squash Merge vs Merge Commit for Clean Release History
Squash merges produce one commit per pull request, giving a clean, linear history that is easy to read and revert. Merge commits preserve every individual...
Python Dataclasses vs Pydantic Models for Internal Domain Objects
Use Pydantic models at the edges of your system, where untrusted data enters and needs validation, and use plain dataclasses for internal domain objects whose...
Python FastAPI Dependency Injection vs Global Singletons for Database Sessions
In FastAPI, create database sessions per request through a dependency, and keep only the engine or connection pool as a shared object. A single global session...
React Native Secure Token Storage vs AsyncStorage for Auth Sessions
AsyncStorage is unencrypted key-value storage meant for non-sensitive data, so auth tokens should live in secure storage backed by the iOS Keychain and the...
React Native FlatList Performance Tuning for Long Feeds
To keep a long React Native feed smooth, give FlatList stable keys, memoize row components, avoid creating new functions and objects on every render, and tune...