https://schemadrawer.com/blog/ Database migrations, schema design, ER diagrams and the tooling around them. en Fri, 25 Sep 2026 08:00:00 +0000 https://schemadrawer.com/blog/database-migration-anti-patterns/ https://schemadrawer.com/blog/database-migration-anti-patterns/ Tue, 22 Sep 2026 08:00:00 +0000 Migration tools Editing applied migrations, environment-specific scripts, ORM auto-DDL in production, untested rollbacks: ten habits that break deployments, with a fix for each. https://schemadrawer.com/blog/zero-downtime-database-migrations-expand-contract/ https://schemadrawer.com/blog/zero-downtime-database-migrations-expand-contract/ Fri, 18 Sep 2026 08:00:00 +0000 CI/CD and workflow How to change a live schema without an outage: expand, backfill in batches, switch reads and writes, then contract. With safe NOT NULL, renames and lock timeouts. https://schemadrawer.com/blog/testing-database-migrations-with-docker/ https://schemadrawer.com/blog/testing-database-migrations-with-docker/ Tue, 15 Sep 2026 08:00:00 +0000 CI/CD and workflow Run migrations against a throw-away real database on every change: a Testcontainers and Flyway example, CI service containers, version matrices and schema checks. https://schemadrawer.com/blog/sqlite-for-development-differences/ https://schemadrawer.com/blog/sqlite-for-development-differences/ Fri, 11 Sep 2026 08:00:00 +0000 Databases Type affinity, limited ALTER TABLE and foreign keys that are off by default: what breaks when you develop on SQLite and deploy to PostgreSQL, and how to avoid it. https://schemadrawer.com/blog/sql-server-schemas-dbo-explained/ https://schemadrawer.com/blog/sql-server-schemas-dbo-explained/ Tue, 08 Sep 2026 08:00:00 +0000 Databases What a schema is in SQL Server, why everything lands in dbo, how default schemas work, and how Flyway, Liquibase, EF Core, DbUp and FluentMigrator target schemas. https://schemadrawer.com/blog/oracle-uppercase-identifiers-explained/ https://schemadrawer.com/blog/oracle-uppercase-identifiers-explained/ Fri, 04 Sep 2026 08:00:00 +0000 Databases Oracle folds unquoted names to upper case, PostgreSQL to lower case, MySQL depends on a setting, SQL Server on collation. The rules, and how to stay out of trouble. https://schemadrawer.com/blog/choosing-column-types/ https://schemadrawer.com/blog/choosing-column-types/ Tue, 01 Sep 2026 08:00:00 +0000 Databases A practical guide to column types in PostgreSQL, MySQL, SQL Server, Oracle and SQLite: strings, timestamps, money, booleans, JSON, enums and what diagrams report. https://schemadrawer.com/blog/transactional-ddl-explained/ https://schemadrawer.com/blog/transactional-ddl-explained/ Fri, 28 Aug 2026 08:00:00 +0000 Databases Which engines run DDL in transactions (PostgreSQL, SQL Server, SQLite), which commit implicitly (MySQL, MariaDB, Oracle), and how to write migrations for both. https://schemadrawer.com/blog/postgresql-vs-mysql-vs-mariadb/ https://schemadrawer.com/blog/postgresql-vs-mysql-vs-mariadb/ Tue, 25 Aug 2026 08:00:00 +0000 Databases A practical comparison of PostgreSQL, MySQL and MariaDB: data types, SQL conformance, transactional DDL, replication, hosting and what each means for migrations. https://schemadrawer.com/blog/diesel-migrations-rust-guide/ https://schemadrawer.com/blog/diesel-migrations-rust-guide/ Fri, 21 Aug 2026 08:00:00 +0000 Migration tools How Diesel manages a schema in Rust: the CLI, timestamped folders with up.sql and down.sql, the versions table, the generated schema.rs and embedded migrations. https://schemadrawer.com/blog/doctrine-migrations-symfony-guide/ https://schemadrawer.com/blog/doctrine-migrations-symfony-guide/ Tue, 18 Aug 2026 08:00:00 +0000 Migration tools Doctrine Migrations in Symfony from setup to deploy: diff versus generate, the Version class, the versions table, reviewing generated SQL and running safely. https://schemadrawer.com/blog/rails-migrations-schema-rb-vs-structure-sql/ https://schemadrawer.com/blog/rails-migrations-schema-rb-vs-structure-sql/ Fri, 14 Aug 2026 08:00:00 +0000 Migration tools How Active Record migrations work, what schema.rb cannot express, when to switch to structure.sql, and how db:prepare and strong_migrations keep a team safe. https://schemadrawer.com/blog/laravel-migrations-best-practices/ https://schemadrawer.com/blog/laravel-migrations-best-practices/ Tue, 11 Aug 2026 08:00:00 +0000 Migration tools Practical rules for Laravel migrations in a team: one change per file, constrained foreign keys, frozen history, schema dumps, safe production runs and tests. https://schemadrawer.com/blog/dbup-vs-fluentmigrator/ https://schemadrawer.com/blog/dbup-vs-fluentmigrator/ Fri, 07 Aug 2026 08:00:00 +0000 Migration tools DbUp runs plain SQL scripts once and journals them; FluentMigrator describes changes in C#. How each works, where each wins, and how both sit next to EF Core. https://schemadrawer.com/blog/sqitch-dependency-based-migrations/ https://schemadrawer.com/blog/sqitch-dependency-based-migrations/ Tue, 04 Aug 2026 08:00:00 +0000 Migration tools How Sqitch plans, deploys, reverts and verifies database changes with named dependencies instead of version numbers, and when it is worth the learning curve. https://schemadrawer.com/blog/schema-drift-detection-and-prevention/ https://schemadrawer.com/blog/schema-drift-detection-and-prevention/ Fri, 31 Jul 2026 08:00:00 +0000 CI/CD and workflow What schema drift is, how it creeps in through hotfixes and unsynced environments, the tools that detect it and the workflow that stops it coming back. https://schemadrawer.com/blog/database-documentation-best-practices/ https://schemadrawer.com/blog/database-documentation-best-practices/ Tue, 28 Jul 2026 08:00:00 +0000 CI/CD and workflow What to document about a database, where it should live, how to generate the parts that rot, and how to keep schema docs honest through code review and CI. https://schemadrawer.com/blog/go-migration-tools-compared/ https://schemadrawer.com/blog/go-migration-tools-compared/ Tue, 21 Jul 2026 08:00:00 +0000 Migration tools Four Go migration tools compared: file layouts, how each records applied versions, checksums, embedding in Go binaries, database support and where each fits. https://schemadrawer.com/blog/foreign-keys-on-delete-and-indexing/ https://schemadrawer.com/blog/foreign-keys-on-delete-and-indexing/ Fri, 17 Jul 2026 08:00:00 +0000 Databases ON DELETE actions explained, why PostgreSQL leaves FK columns unindexed while InnoDB indexes them, deferrable constraints and NOT VALID on big tables. https://schemadrawer.com/blog/mermaid-er-diagrams-guide/ https://schemadrawer.com/blog/mermaid-er-diagrams-guide/ Tue, 14 Jul 2026 08:00:00 +0000 Diagrams and documentation How to write Mermaid erDiagram blocks: entities, attributes with PK and FK markers, cardinality symbols, where they render, and what Mermaid cannot do. https://schemadrawer.com/blog/ef-core-migrations-guide/ https://schemadrawer.com/blog/ef-core-migrations-guide/ Fri, 10 Jul 2026 08:00:00 +0000 Migration tools What dotnet ef migrations add generates, how to apply migrations with database update, idempotent scripts and bundles, and surviving model snapshot conflicts. https://schemadrawer.com/blog/alembic-autogenerate-pitfalls/ https://schemadrawer.com/blog/alembic-autogenerate-pitfalls/ Tue, 07 Jul 2026 08:00:00 +0000 Migration tools How Alembic autogenerate compares SQLAlchemy metadata with the live database, the changes it cannot see, constraint naming conventions and SQLite batch mode. https://schemadrawer.com/blog/primary-keys-serial-vs-uuid-vs-ulid/ https://schemadrawer.com/blog/primary-keys-serial-vs-uuid-vs-ulid/ Fri, 03 Jul 2026 08:00:00 +0000 Databases Integer, UUID or ULID primary keys compared on size, index locality, guessability and generation, with engine specifics and a recommendation per situation. https://schemadrawer.com/blog/best-database-schema-visualization-tools/ https://schemadrawer.com/blog/best-database-schema-visualization-tools/ Tue, 30 Jun 2026 08:00:00 +0000 Diagrams and documentation From dbdiagram.io and DBeaver to SchemaSpy, tbls and Mermaid: what each schema visualization tool takes as input, what it produces and when to use it. https://schemadrawer.com/blog/typeorm-migrations-guide/ https://schemadrawer.com/blog/typeorm-migrations-guide/ Fri, 26 Jun 2026 08:00:00 +0000 Migration tools TypeORM migrations in practice: DataSource setup, generate versus create, running TypeScript migrations, migrationsRun, and why synchronize is unsafe in production. https://schemadrawer.com/blog/django-migrations-explained/ https://schemadrawer.com/blog/django-migrations-explained/ Tue, 23 Jun 2026 08:00:00 +0000 Migration tools What Django migration files contain, how dependencies and RunPython work, when to squash, how to check migrations in CI, and the traps that catch teams. https://schemadrawer.com/blog/many-to-many-relationships-join-tables/ https://schemadrawer.com/blog/many-to-many-relationships-join-tables/ Fri, 19 Jun 2026 08:00:00 +0000 Databases Join table design: naming, composite key or surrogate id, extra columns, indexes both ways and ON DELETE rules, with SQL, Django, Prisma and Rails examples. https://schemadrawer.com/blog/keep-database-diagram-up-to-date-in-ci/ https://schemadrawer.com/blog/keep-database-diagram-up-to-date-in-ci/ Tue, 16 Jun 2026 08:00:00 +0000 CI/CD and workflow Turn the schema diagram into a build artifact: regenerate it from the migrations on every change, commit it through a pull request and review the diff. https://schemadrawer.com/blog/drizzle-migrations-guide/ https://schemadrawer.com/blog/drizzle-migrations-guide/ Fri, 12 Jun 2026 08:00:00 +0000 Migration tools How Drizzle migrations work: drizzle-kit generate, the SQL files, snapshots and meta/_journal.json, applying them with migrate, and when to use push instead. https://schemadrawer.com/blog/liquibase-changelog-formats-xml-yaml-sql/ https://schemadrawer.com/blog/liquibase-changelog-formats-xml-yaml-sql/ Tue, 09 Jun 2026 08:00:00 +0000 Migration tools Liquibase accepts XML, YAML, JSON and formatted SQL changelogs. The same table in each format, how include and includeAll work, and which format fits which team. https://schemadrawer.com/blog/database-normalization-explained/ https://schemadrawer.com/blog/database-normalization-explained/ Fri, 05 Jun 2026 08:00:00 +0000 Databases Normalization walked through on a vet clinic spreadsheet: 1NF, 2NF, 3NF and BCNF explained in plain words, ending in the PetClinic tables, plus when to denormalize. https://schemadrawer.com/blog/generate-er-diagram-from-migration-files/ https://schemadrawer.com/blog/generate-er-diagram-from-migration-files/ Tue, 02 Jun 2026 08:00:00 +0000 Diagrams and documentation Three ways to turn Flyway, Liquibase, Prisma or Django migrations into an ER diagram, and a step-by-step guide to the one that always matches reality. https://schemadrawer.com/blog/nodejs-migration-tools-compared/ https://schemadrawer.com/blog/nodejs-migration-tools-compared/ Fri, 29 May 2026 08:00:00 +0000 Migration tools How five Node.js tools write, track and run database migrations, with a real migration file for each, a comparison table and advice on which one fits your project. https://schemadrawer.com/blog/flyway-naming-conventions-and-versioning/ https://schemadrawer.com/blog/flyway-naming-conventions-and-versioning/ Tue, 26 May 2026 08:00:00 +0000 Migration tools How Flyway names and orders migrations: the V, R and U prefixes, version separators, checksums, repair, outOfOrder and baseline, plus the mistakes that bite. https://schemadrawer.com/blog/database-naming-conventions/ https://schemadrawer.com/blog/database-naming-conventions/ Fri, 22 May 2026 08:00:00 +0000 Databases A practical naming convention for tables, columns, keys, constraints and indexes, plus the case-folding rules of PostgreSQL, Oracle, MySQL and SQL Server. https://schemadrawer.com/blog/how-to-read-a-database-schema-diagram/ https://schemadrawer.com/blog/how-to-read-a-database-schema-diagram/ Tue, 19 May 2026 08:00:00 +0000 Diagrams and documentation Learn to read any schema diagram: primary and composite keys, foreign keys and arrow direction, one-to-many, join tables, one-to-one and self-references. https://schemadrawer.com/blog/prisma-migrate-explained/ https://schemadrawer.com/blog/prisma-migrate-explained/ Fri, 15 May 2026 08:00:00 +0000 Migration tools How Prisma Migrate works: the migrations folder layout, migrate dev versus migrate deploy, the shadow database, drift detection and baselining an existing database. https://schemadrawer.com/blog/flyway-vs-liquibase/ https://schemadrawer.com/blog/flyway-vs-liquibase/ Tue, 12 May 2026 08:00:00 +0000 Migration tools A practical comparison of Flyway and Liquibase: migration model, file formats, rollback, checksums and validation, integrations, and a decision guide for teams. https://schemadrawer.com/blog/why-parsing-sql-is-not-enough-to-draw-a-schema/ https://schemadrawer.com/blog/why-parsing-sql-is-not-enough-to-draw-a-schema/ Fri, 08 May 2026 08:00:00 +0000 Diagrams and documentation SQL parsers stumble on dialects, procedural blocks, generated DDL and renames across files. Running migrations on a real engine and reading the catalog is reliable. https://schemadrawer.com/blog/what-is-an-er-diagram/ https://schemadrawer.com/blog/what-is-an-er-diagram/ Tue, 05 May 2026 08:00:00 +0000 Diagrams and documentation A plain explanation of entity-relationship diagrams: entities, attributes, relationships, cardinality, the common notations, and what belongs in one.