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It seems that a *.sql file I recently imported had use mysql instead of use dbname. Now the mysql database contains a large number of tables which don't belong there.

Is there an easy/efficient way to clean this up?


Note: I am using MariaDB, but I think a generic answer would be more useful for others.

mysql Ver 15.1 Distrib 10.1.10-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2

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No clean way...

USE MyDatabase;
RENAME TABLE mysql.mytable1 TO mytable1;
RENAME TABLE mysql.mytable2 TO mytable2;

etc.

You said "large number"... You could get the list thus:

SELECT CONCAT('RENAME TABLE mysql.', TABLE_NAME, ' TO ', TABLENAME, ';')
    FROM information_schema.TABLES
    WHERE schema_name = 'mysql';

But be very careful not to rename the system tables!

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  • Ok.. Where could I find a list of the "correct" tables in the mysql database?
    – donquixote
    Jan 20, 2016 at 11:02
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    @donquixote: The mysql Database Tables - MariaDB Knowledge Base (no idea if that list is exhaustive, though – looks like it should be but I'm not sure)
    – Andriy M
    Jan 20, 2016 at 12:45
  • @donquixote you could also grep for them in your most recent backup file from before the mistake was made. Jan 20, 2016 at 18:28

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