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5.7 deprecation of alter ignore

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Shlomi Noach 2017-02-06 07:48:48 +02:00
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@ -17,6 +17,10 @@ Read more on [cut-over](cut-over.md) and on the [cut-over design Issue](https://
Adding a `UNIQUE KEY` is possible, in the condition that no violation will occur. That is, you must make sure there aren't any violating rows on your table before, and during the migration.
At this time there is no equivalent to `ALETER IGNORE`, where duplicates are implicitly and silently thrown away. This behavior may be supported in the future.
At this time there is no equivalent to `ALETER IGNORE`, where duplicates are implicitly and silently thrown away. The MySQL `5.7` docs say:
> As of MySQL 5.7.4, the IGNORE clause for ALTER TABLE is removed and its use produces an error.
It is therefore unlikely that `gh-ost` will support this behavior.
# Why