On 7/15/22 18:31, merryok wrote: > I'm sorry, first time to post a thread. mtr is short for mini-transaction. > About mtr in mysql, we can refer to > https://dev.mysql.com/doc/refman/8.0/en/glossary.html > <https://dev.mysql.com/doc/refman/8.0/en/glossary.html> or > https://dev.mysql.com/blog-archive/mysql-8-0-new-lock-free-scalable-wal-design/ > <https://dev.mysql.com/blog-archive/mysql-8-0-new-lock-free-scalable-wal-design/> > > > > So an insert in mysql, wrapped in a user transaction, may result in > multiple mini-transactions, one is responsible for writing redo for > undo, the other one for writing redo for clustered index/secondary > index, and so on. Each mtr may modify multiple pages, whose redo logs > are guaranteed by mtr to be written into disk or none of them are written. > Read this: https://www.postgresql.org/docs/current/wal.html and see if it answers your questions. -- Adrian Klaver adrian.klaver@aklaver.com
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