MYSQL：删除与损坏的数据库有关的所有内容

Question

I had a corrupted database on my development environment that I could not access any more - probably due to a system crash. As I could not DROP the database (I can't remember why - doesnt matter any more now) I just deleted the databases folder in mysql/data.

This obviously was not a very good idea. After creating a new database with the same name, there are still some tablespace definitions somewhere in the database. When I try create new tables I get following error:

Tablespace for table ' database_name . table_name ' exists. Please DISCARD the tablespace before IMPORT.

Is there a decent way to get rid of all references/indexes/tablespace information for the given database? When I try to DROP the newly created Database with the same name, I get: "ERROR 2013 (HY000): Lost connection to MySQL server during query".

Answer 1

when you get to a situation like that, the best thing to do is:

1. backup your database
2. delete entire database
3. restore your database from backup

Answer 2

For each table run these two queries:

    ALTER TABLE tablename DISCARD TABLESPACE;
    ALTER TABLE tablename IMPORT TABLESPACE;

If there are too many tables just write a script to loop through them using SHOW TABLES and then the two queries above.