should I use mysqldump from the Mysql 4.0 or 4.1?
Thx for all other tips!
At 21:44 23.08.2005, Bruce Dembecki wrote:
>Once you decide to use mysqldump, be aware that the quickest way to
>export/import large files is to use the --tab feature on export and
>mysqlimport to load the data...
>On the old (4.0) server:
>mysqldump --tab=/var/tmp/directory mydatabase
>On the new (4.1) server (assuming you have a new empty mysql data
>directory with just your MyISAM based mysql database to ensure your
>permissions files are there):
>mysql -e "create database mydatabase;"
>cat /var/tmp/directory/*.sql | mysql mydatabase
>mysqlimport mydatabase /var/tmp/directory/*.txt
>Essentially you are creating a text .sql file for each table with the
>create table command, and a .txt file with the raw data in tab
>delimitted format... mysqlimport imports the whole data file as one
>SQL command, using traditional mysqldump you get a unique SQL insert
>command for each line of data... doing it once means only writing the
>indexes etc. once and other time saving advantages... it's far
>quicker to insert many rows of data as a single INSERT command, than
>it is to do it row by row. So if you have a large data set and you
>are doing the export/import thing, that is the way to go...
>That said there is another option... in theory you can upgrade to 4.1
>keeping your shared table files, then tell each table to "ALTER TABLE
>engine=innodb", this will force it to rewrite the table from scratch,
>and if you have innodb_file_per_table set, it will be created
>accordingly... The benefit here is your downtime is minimal but the
>problem is at the end of the day you are still left with your shared
>innodb table space, and even though it may be mostly empty, you can't
>clean it up and make it smaller.
>Best Regards, Bruce
>On Aug 23, 2005, at 6:19 AM, Rafal Kedziorski wrote:
>>we have an J2EE application which ist using MySQL 4.0. There is an
>>bug, which was fixed in MySQL 4.1. We are using tracactions and
>>InnoDB is don't use query cache. Now we have to migrate our DB to
>>MySQL 4.1 for use this feature. In our actual installation we store
>>our data in one inndodb file. After migration we wan't use file per
>>What is the best and fastest way to make migration?
>>MySQL General Mailing List
>>For list archives: http://lists.mysql.com/mysql
>>To unsubscribe: http://lists.mysql.com/mysql? unsub=bruce@stripped