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Editorial Team
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Asked: 2026-06-09T06:17:56+00:00

I’m doing an update to MySQL Database which includes MySQL scripts that make ALTER

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I’m doing an update to MySQL Database which includes MySQL scripts that make ALTER TABLE sentences, as well as DIU sentences (delete, insert, update).

The idea is to make a transactional update, so if a sentence fails, a rollback is made, but if I put ALTER TABLE sentences or others specified in http://dev.mysql.com/doc/refman/5.0/en/implicit-commit.html an implicit commit is made, so I can’t make a complete rollback, because the indicated operations remains commited.

I tried to use mysqldump to make a backup which is used in case of error (mysql returns distinct to zero), but it is too slow and can fail too.

What can I do? I need this to ensure that future updates are safe and not too slow, because databases contains between 30-100 GB of data.

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1 Answer

  1. Editorial Team

    dump and reload might be your best options instead of alter table.

    From mysql prompt or from the database script:


    select * from mydb.myt INTO OUTFILE '/var/lib/mysql/mydb.myt.out';
    drop table mydb.myt;
    create table    myt(your table ddl here)
    load data infile '/var/lib/mysql/mydb.myt.out' INTO TABLE mydb.myt;

    Check this out:

    http://everythingmysql.ning.com/profiles/blogs/whats-faster-than-alter

    I think it offers good guidance on “alternatives to alter”.

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