1set @save_master_verify_checksum =  @@global.master_verify_checksum;
2select @@global.master_verify_checksum  as 'must be zero because of default';
3must be zero because of default
40
5select @@session.master_verify_checksum  as 'no session var';
6ERROR HY000: Variable 'master_verify_checksum' is a GLOBAL variable
7set @@global.master_verify_checksum = 0;
8set @@global.master_verify_checksum = default;
9set @@global.master_verify_checksum = 2;
10ERROR 42000: Variable 'master_verify_checksum' can't be set to the value of '2'
11set @@global.master_verify_checksum = @save_master_verify_checksum;
12