mariadb/mysql-test/suite/sys_vars/r/last_gtid_basic.result at 36f67a7dff9087236e3c8b99452702b638fd020e - mirror/mariadb - May the force be without you: git.fucktheforce.de

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unknown 4e6606acad MDEV-4984: Implement MASTER_GTID_WAIT() and @@LAST_GTID.

MASTER_GTID_WAIT() is similar to MASTER_POS_WAIT(), but works with a
GTID position rather than an old-style filename/offset.

@@LAST_GTID gives the GTID assigned to the last transaction written
into the binlog.

Together, the two can be used by applications to obtain the GTID of
an update on the master, and then do a MASTER_GTID_WAIT() for that
position on any read slave where it is important to get results that
are caught up with the master at least to the point of the update.

The implementation of MASTER_GTID_WAIT() is implemented in a way
that tries to minimise the performance impact on the SQL threads,
even in the presense of many waiters on single GTID positions (as
from @@LAST_GTID).

2014-02-07 19:15:28 +01:00

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 SELECT @@global.last_gtid;
 ERROR HY000: Variable 'last_gtid' is a SESSION variable
 SET GLOBAL last_gtid= 10;
 ERROR HY000: Variable 'last_gtid' is a read only variable
 SET SESSION last_gtid= 20;
 ERROR HY000: Variable 'last_gtid' is a read only variable
 SELECT @@session.last_gtid;
 @@session.last_gtid