How can I run a MySQL optimize table command without locking the table?
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We have a very huge Mysql table which is MyISAM. Whenever we run optimize table command, the table is locked and performance is getting impacted. The table is not read only and hence creating temporary tables and swapping them may not work out. We are not able to partition the table also. Is there any other way/tool to achieve optimize table functionality without degrading the performance?
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Answer:
There's a free tool to execute many types of table changes while allowing you to have concurrent read/write access to the table: $ pt-online-schema-change --alter "ENGINE=MyISAM" D=mydatabase,t=mytable See http://www.percona.com/doc/percona-toolkit/2.1/pt-online-schema-change.html PS: Even better would be: $ pt-online-schema-change --alter "ENGINE=InnoDB" D=mydatabase,t=mytable You should really use InnoDB instead of MyISAM.
Bill Karwin at Quora Visit the source
Other answers
You should use InnoDB instead of MyISAM because MyISAM is table lock and InnoDB is row lock, so InnoDB run faster. In some case, take a look at HandlerSocket with InnoDB
Tuan Vuong
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