SET @save_binlog_commit_wait_usec= @@GLOBAL.binlog_commit_wait_usec;
SELECT @@GLOBAL.binlog_commit_wait_usec as 'check default';
check default
100000
SELECT @@SESSION.binlog_commit_wait_usec  as 'no session var';
ERROR HY000: Variable 'binlog_commit_wait_usec' is a GLOBAL variable
SET GLOBAL binlog_commit_wait_usec= 0;
SET GLOBAL binlog_commit_wait_usec= DEFAULT;
SET GLOBAL binlog_commit_wait_usec= 10000;
SELECT @@GLOBAL.binlog_commit_wait_usec;
@@GLOBAL.binlog_commit_wait_usec
10000
SET GLOBAL binlog_commit_wait_usec = @save_binlog_commit_wait_usec;