Hi,
On 5/9/2013 1:06 PM, Kristian Nielsen wrote:
"nanyi607rao" <[email protected]> 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.
According to my records, if you choose PBXT as your second engine,
you'll also need --pbxt-support-xa to hit the code (apparently it's OFF
by default).
Good luck,
Elena
As you can imagine, this is not the best tested part of the server ;-). Let us
know if you discover any problems.
- Kristian.
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