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ralexandr/non_blocking_alter_table.sql

Last active September 2, 2020 06:00
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Non-blocking ALTER TABLE for mySQL
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non_blocking_alter_table.sql
ALTER TABLE `my_awesome_database`.`user_transaction`
ADD FOREIGN KEY (`userId`) REFERENCES `my_awesome_database`.`user` (`id`),
ALGORITHM=INPLACE, LOCK=NONE;
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ralexandr commented Sep 2, 2020 •
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In case you get ALGORITHM=INPLACE is not supported. Reason: Adding foreign keys needs foreign_key_checks=OFF

Run following query before altering your table (it will disable foreign checks only for your current db-connection)

SET SESSION foreign_key_checks=OFF;

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