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Docs: --retain-artifacts DDL strategy flag #1590

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Sep 19, 2023
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Docs: --retain-artifacts DDL strategy flag #1590

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2 changes: 2 additions & 0 deletions content/en/docs/18.0/user-guides/schema-changes/ddl-strategy-flags.md
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Expand Up @@ -33,6 +33,8 @@ Vitess respects the following flags. They can be combined unless specifically in

- `--postpone-launch`: initiate a migration that remains `queued` and only launches per user command. See [postponed migrations](../postponed-migrations).

- `--retain-artifacts=<duration>`: set an explicit artifact retention for this migration. If nonzero, this value overrides the `vttablet --retain_online_ddl_tables` value.

- `--singleton`: only allow a single pending migration to be submitted at a time. From the moment the migration is queued, and until either completion, failure or cancellation, no other new `--singleton` migration can be submitted. New requests will be rejected with error. `--singleton` works as a an exclusive lock for pending migrations. Note that this only affects migrations with `--singleton` flag. Migrations running without that flag are unaffected and unblocked.

- `--singleton-context`: only allow migrations submitted under same _context_ to be pending at any given time. Migrations submitted with a different _context_ are rejected for as long as at least one of the initially submitted migrations is pending.
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