I had a quite painful experience yesterday, I would say…<\/p>\n
We were about to run live database migrations, when I decided to try it first in a staging database server, to have a more precise idea of how long they would take. So I connected to the MySQL test system:<\/p>\n
\r\nmysql> use myopera\r\nReading table information for completion of table and column names\r\nYou can turn off this feature to get a quicker startup with -A\r\n\r\nDatabase changed\r\nmysql> BEGIN WORK;\r\nQuery OK, 0 rows affected (0.00 sec)\r\n\r\nmysql> ALTER TABLE blah ADD COLUMN xxx ...\r\n...\r\n<\/pre>\nThe ALTER<\/b> operation completed in a minute or so. Then I wanted to revert it, so I typed:<\/p>\n
\r\nmysql> ROLLBACK;\r\n<\/pre>\nSo the transaction was rolled back. Just to double check, I verified that the table was indeed left in its original state, and to my surprise, it wasn't<\/b>. Yes, the table is a InnoDB<\/b> table, and yes, I had put the ALTER statement in a transaction<\/b>.<\/p>\n
Even after a ROLLBACK<\/b> the table is left altered… Isn't that surprising? For me, it was. Of course, it is a documented MySQL behavior<\/a>, and it's filed as bug\/feature request<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"
I had a quite painful experience yesterday, I would say… We were about to run live database migrations, when I decided to try it first in a staging database server, to have a more precise idea of how long they would take. So I connected to the MySQL test system: mysql> use myopera Reading table […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[462,464,58,54,463],"yoast_head":"\n
MySQL alter table in a transaction - Random hacking<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.streppone.it\/cosimo\/blog\/2010\/04\/mysql-alter-table-in-a-transaction\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MySQL alter table in a transaction - Random hacking\" \/>\n<meta property=\"og:description\" content=\"I had a quite painful experience yesterday, I would say… We were about to run live database migrations, when I decided to try it first in a staging database server, to have a more precise idea of how long they would take. 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