Re: equivalent thing of mtr in mysql

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(dot)klaver(at)aklaver(dot)com