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How to compare the schemas of two databases with Masume

Find differences in tables, columns, indexes, and constraints between two connections.

Short answer: Install Masume and confirm it runs with masume --version; then add a profile for each database in the config file or use a URL target; run masume diff SOURCE TARGET with the two connections. All steps.

Who it is forA developer checking that a staging database matches production before a release.

The problemSchema drift between environments causes failed deploys that are hard to trace.

The outcomeYou see the schema differences between the two connections and decide what to change.

What you need first

  • A terminal on macOS, Linux, or Windows
  • A database you can reach, or a local SQLite file
  • One install method: Homebrew, npm, Go 1.27 or later, or a release package

Steps

  1. Install Masume and confirm it runs with masume --version
  2. Add a profile for each database in the config file or use a URL target
  3. Run masume diff SOURCE TARGET with the two connections
  4. Review the reported differences in tables, columns, indexes, and constraints

Prompt for your agent

Run `masume diff <source> <target>` in the masume repo and summarize the differences found. Expected output: a list of schema differences. Verify one reported difference by inspecting that table in both databases.

Caveat. Schema compare covers tables, columns, indexes, and constraints as described in the README, not every object type.

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Using the Deduped MCP, get the setup steps for masumedb/masume and "Compare the schemas of two databases"

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