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Online schema change tools for MySQL

For a very busy MySQL table, why might you choose gh-ost over pt-online-schema-change?

A.gh-ost changes the table in place without a copyB.gh-ost does not need any extra disk spaceC.gh-ost works without row-based binlogsD.gh-ost reads changes from the binlog instead of using triggers, so it adds less write load and can be paused or throttled cleanly

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Online schema change tools for MySQL

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