MySQL on Ricky Moorhouse

MySQL: From multi-master to circular replication

Tue, 26 Jul 2011 12:32:52 +0000

Disable anything that will write to the database
- Update the my.cnf files for all servers to support circular replication, by adding log-slave-updates and ensuring you have unique server ids and the auto increment values are suitable. Then restart mysql to pick up the config changes.
- Ensure your existing replication is up-to-date using: SHOW SLAVE STATUS
- Stop replication on both existing servers using STOP SLAVE
- Create a backup of the database from the server that will be just before your new server in the circle using: mysqldump --master-data=1 -a -c -Q {db} > {filename}

Sort by Surname

Tue, 07 Jun 2011 13:36:24 +0000

ORDER BY SUBSTRING_INDEX(full_name, ' ', -1)

Load CSV data into MySQL

Tue, 12 Jan 2010 11:20:58 +0000


    load data local infile 'export.csv' into table table_name
    fields terminated by ','
    enclosed by '"'
    lines terminated by 'n'
    (field_list)

Useful SQL

Thu, 15 Oct 2009 09:00:11 +0000

update [table_name] set [field_name] = replace([field_name], '[string_to_find]', '[string_to_replace]');

Replace within a field