What Is a Database Schema Diff Tool (and When You Need One)
What a database schema diff tool does, how it works, and the situations where it saves you from painful production surprises.
Database Guides
Multi-Tenant Schema Management: Keeping Per-Tenant Databases in Sync
How to detect and fix schema drift across per-tenant or shared-schema multi-tenant databases, and how to roll out migrations across many tenants safely.
Database Guides
Oracle to PostgreSQL Migration: Comparing Schemas Across Dialects
A schema-level look at migrating from Oracle to PostgreSQL — NUMBER types, sequences, and the objects that need manual review.
Best Database Migration Tools: What Makes One Advanced
The criteria that separate the best database migration tools from basic ones: readable generated SQL, cross-dialect awareness, dry-run safety, and CI fit.
How to Find Which Indexes Are Actually Used
How to find unused database indexes with real usage stats in PostgreSQL, MySQL, SQL Server, Oracle, Db2, and SQLite, and why a zero-usage counter isn't reason enough to drop one.
Rollback Strategies for Database Schema Migrations
How to plan safe rollbacks for schema migrations: reversible vs irreversible changes, pre-migration snapshots, and testing the rollback itself.
Large-Table ALTER Strategies: Changing Schema Without Locking Production
How to add columns, change types, and backfill huge tables without long locks: native online DDL per dialect, expand/contract, batched backfills, and gh-ost.
Generated and Computed Columns Across Database Dialects
How PostgreSQL, MySQL, MariaDB, SQL Server, Oracle, and SQLite differ on stored vs. virtual generated columns, and what breaks when you migrate them.
Table Partitioning Strategies Across Database Dialects
How PostgreSQL, MySQL, SQL Server, and Oracle differ in partition syntax, key constraints, and what breaks when you migrate a partitioned table.
Integer ID vs UUID: Storage, Index Performance, and the Alias Pattern
Comparing integer and UUID primary keys: storage size, B-tree index locality, UUIDv4 vs v7, and the pattern of using an integer key with a UUID alias.
