departure
Percona's pt-online-schema-change runner for ActiveRecord migrations. (by departurerb)
reshape
An easy-to-use, zero-downtime schema migration tool for Postgres (by fabianlindfors)
departure | reshape | |
---|---|---|
1 | 16 | |
134 | 1,666 | |
0.0% | - | |
8.0 | 7.4 | |
3 months ago | about 2 months ago | |
Ruby | Rust | |
GNU General Public License v3.0 or later | MIT License |
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
departure
Posts with mentions or reviews of departure.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2022-05-04.
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Changing Tires at 100mph: A Guide to Zero Downtime Migrations
At least for Rails there are several gems available (ie https://github.com/WeTransfer/ghost_adapter or https://github.com/departurerb/departure) that seamlessly hook into the existing migration system and will run all eligible migrations through gh-ost or pt-osc as needed. You're right that it's not free but it isn't all that far off either.
That said, online schema migrations are a specialized tool designed for very big tables that take hours to run an ALTER TABLE on. If all your tables are small enough that alterations take less than a second or so, don't bother and just block the table for a bit. It's fine.
reshape
Posts with mentions or reviews of reshape.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2023-10-03.
- Show HN: Reshape – Zero-downtime schema migrations for Postgres
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Pgroll: zero-downtime, undoable, schema migrations for Postgres
Cool stuff! Do you have any thoughts about how this compares to https://github.com/fabianlindfors/reshape?
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Postgres schema changes are still a PITA
From what I know, there is only one project that tries something close to this: the relatively recent Reshape. It uses Postgres views to expose the two versions of the schema and triggers to upgrade/downgrade the new data. It doesn’t do the constraints part as described above, but shows that this approach is possible. Combined with the Xata pull request based workflow, I think the ideal system described above is possible!
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Conceptually how do you handle deploys of SQL related things (table definition, scripts, stored procs etc) in a CI/CD way?
My idea is not unique. Reshape is similar, but bigger in scope.
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The operational relational schema paradigm
This is precisely what I did for my automated zero-downtime migration tool and it works pretty well: https://github.com/fabianlindfors/reshape. At least for Postgres, simple views like these have almost no overhead as queries are simply rewritten for the underlying table.
-
Changing Tires at 100mph: A Guide to Zero Downtime Migrations
Anybody interested in this subject might also be interested in a tool for Postgres I’ve been working on, Reshape: https://github.com/fabianlindfors/reshape. It aims to fully automate away all the pain and manual steps zero-downtime migrations normally requires :)
- Reshape: An experimental, easy-to-use, zero-downtime migration tool for Postgres
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PostgreSQL at Scale: Database Schema Changes Without Downtime
This post is absolutely terrific and has been been my main reference for Reshape, an automated, zero-downtime schema migration tool: https://github.com/fabianlindfors/reshape
- When Postgres blocks: tips for dealing with locks
- Reshape
What are some alternatives?
When comparing departure and reshape you can also consider the following projects:
data-migrate - Migrate and update data alongside your database structure.
pg-online-schema-change - Easy CLI tool for making zero downtime schema changes and backfills in PostgreSQL [Moved to: https://github.com/shayonj/pg-osc]