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Re: Merge two MySQL databases?
Posted by: Guilhem Bichot
Date: May 06, 2005 02:32AM

Hi,
1) to ensure that you don't lose data in case of crash, put your tables into the InnoDB storage engine instead (I guess you are using the default storage engine: MyISAM); it is transactional and has crash recovery capabilities - very robust.
2) As for merging: I'd suggest:
- restore the old .sql backup
- modify the recent but incomplete .sql: make sure that it does not contain some DROP TABLES or DROP DATABASE, change all INSERT to REPLACE, and restore it

IF every row of every table has a unique key,
then the REPLACE will replace each row by its new version if it exists.

But it's always dangerous to do something so uncertain with your data without knowing. I urge you to read the MySQL manual, it's not that long, and you can skip sections which are not critically needed: http://www.mysql.com/doc

Mr. Guilhem Bichot <guilhem@mysql.com>
MySQL AB, Lead Software Engineer
Bordeaux, France
www.mysql.com

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