SELECT @@GLOBAL.innodb_doublewrite;
@@GLOBAL.innodb_doublewrite
ON
SET @@GLOBAL.innodb_doublewrite=0;
SELECT @@GLOBAL.innodb_doublewrite;
@@GLOBAL.innodb_doublewrite
OFF
SET @@GLOBAL.innodb_doublewrite=2;
SET @@GLOBAL.innodb_doublewrite=3;
ERROR 42000: Variable 'innodb_doublewrite' can't be set to the value of '3'
SELECT @@GLOBAL.innodb_doublewrite;
@@GLOBAL.innodb_doublewrite
fast
SET @@GLOBAL.innodb_doublewrite=1;
SELECT @@GLOBAL.innodb_doublewrite;
@@GLOBAL.innodb_doublewrite
ON
SELECT COUNT(VARIABLE_VALUE)
FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
WHERE VARIABLE_NAME='innodb_doublewrite';
COUNT(VARIABLE_VALUE)
1
'#---------------------BS_STVARS_026_04----------------------#'
SELECT @@innodb_doublewrite = @@GLOBAL.innodb_doublewrite;
@@innodb_doublewrite = @@GLOBAL.innodb_doublewrite
1
1 Expected
'#---------------------BS_STVARS_026_05----------------------#'
SELECT COUNT(@@innodb_doublewrite);
COUNT(@@innodb_doublewrite)
1
1 Expected
SELECT COUNT(@@local.innodb_doublewrite);
ERROR HY000: Variable 'innodb_doublewrite' is a GLOBAL variable
Expected error 'Variable is a GLOBAL variable'
SELECT COUNT(@@SESSION.innodb_doublewrite);
ERROR HY000: Variable 'innodb_doublewrite' is a GLOBAL variable
Expected error 'Variable is a GLOBAL variable'
SELECT COUNT(@@GLOBAL.innodb_doublewrite);
COUNT(@@GLOBAL.innodb_doublewrite)
1
1 Expected
SELECT @@innodb_doublewrite = @@SESSION.innodb_doublewrite;
ERROR HY000: Variable 'innodb_doublewrite' is a GLOBAL variable