"nanyi607rao" <nanyi607...@gmail.com> writes: > In > http://bazaar.launchpad.net/~maria-captains/maria/10.0-mdev452/revision/3434 > you make some change to the class TC_LOG_MMAP,and I want to debug those > codes to see how it works.but i don't understand in what conditions will > MySQL use the TC_LOG_MMAP.it only use TC_LOG_DUMMY or MYSQL_BIN_LOG depends > on the value of opt_bin_log.so how will it use the TC_LOG_MMAP in MySQL.
TC_LOG_MMAP is only used when you have two transactional storage engines (that support XA) enabled in the server _and_ the binlog is disabled. So you need some other transactional engine beside InnoDB. The possibilities I know of are TokuDB and PBXT. If you compile the server with at least two of InnoDB, PBXT, and TokuDB and start it with binlog disabled, TC_LOG_MMAP will be used. You then also need to do a transaction involving at least two of the engines at the same time. As you can imagine, this is not the best tested part of the server ;-). Let us know if you discover any problems. - Kristian. _______________________________________________ Mailing list: https://launchpad.net/~maria-developers Post to : maria-developers@lists.launchpad.net Unsubscribe : https://launchpad.net/~maria-developers More help : https://help.launchpad.net/ListHelp
