Database Constraints: The Defense Layer We Often Forget
Why CHECK, UNIQUE, FOREIGN KEY, and NOT NULL constraints matter as a last line of defense against concurrency bugs and bad data, alongside app validation.
Database Guides
Concepts and best practices for schema management across SQL dialects.
Table vs View: Performance vs Real-Time Data
Tables vs views compared: indexing, pagination, real-time reporting, and when a view is abstraction rather than a performance win.
Stored Procedures vs ORM: Performance vs Flexibility
Stored procedures vs ORMs: a practical comparison of latency, transactions, consistency, testing, deployment, and horizontal scaling costs.
MySQL to ClickHouse Migration: A Schema-Level Guide
How MySQL and ClickHouse schemas differ: engine families, no indexes/FKs/triggers, Nullable() typing, and what to check before migrating.
Db2 to PostgreSQL Migration: A Schema-Level Guide
How Db2 and PostgreSQL schemas differ — identity columns, tablespaces, naming, and types — plus a practical sequence for migrating safely.
Azure SQL vs SQL Server: Schema Differences You Need to Know
Azure SQL Database and SQL Server share T-SQL syntax but diverge on collation, cross-database queries, instance-level objects, and tier limits. Here's what breaks.
MariaDB to PostgreSQL Migration: A Schema-Level Guide
How MariaDB and PostgreSQL schemas diverge on sequences, types, and casing, and how to generate a safe migration script instead of hand-translating DDL.
The Expand/Contract Pattern for Safe Schema Migrations
How the expand/contract (parallel change) pattern splits risky schema changes into safe phases, with a worked example and how to generate the SQL for each step.
Sequences, Identity Columns, and Auto-Increment: How They Differ Across Databases
How auto-increment, identity columns, and sequences differ across MySQL, PostgreSQL, SQL Server, Oracle, and Db2 — and where cross-dialect migrations break.
SQL Server to Oracle Migration: A Schema-Level Guide
Migrating SQL Server schemas to Oracle: data type mapping, IDENTITY to sequences, identifier case rules, the empty-string trap, and generating safe migration DDL.
