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SET @start_global_value = @@global.innodb_log_page_checksum;
#
# exists as global only
#
select @@global.innodb_log_page_checksum;
@@global.innodb_log_page_checksum
0
select @@session.innodb_log_page_checksum;
ERROR HY000: Variable 'innodb_log_page_checksum' is a GLOBAL variable
show global variables like 'innodb_log_page_checksum';
Variable_name Value
innodb_log_page_checksum OFF
show session variables like 'innodb_log_page_checksum';
Variable_name Value
innodb_log_page_checksum OFF
select * from information_schema.global_variables
where variable_name='innodb_log_page_checksum';
VARIABLE_NAME VARIABLE_VALUE
INNODB_LOG_PAGE_CHECKSUM OFF
select * from information_schema.session_variables
where variable_name='innodb_log_page_checksum';
VARIABLE_NAME VARIABLE_VALUE
INNODB_LOG_PAGE_CHECKSUM OFF
#
# show that it's writable
#
set global innodb_log_page_checksum=ON;
select @@global.innodb_log_page_checksum;
@@global.innodb_log_page_checksum
1
set global innodb_log_page_checksum=OFF;
select @@global.innodb_log_page_checksum;
@@global.innodb_log_page_checksum
0
set global innodb_log_page_checksum=1;
select @@global.innodb_log_page_checksum;
@@global.innodb_log_page_checksum
1
set session innodb_log_page_checksum=1;
ERROR HY000: Variable 'innodb_log_page_checksum' is a GLOBAL variable and should be set with SET GLOBAL
#
# incorrect types
#
set global innodb_log_page_checksum=1.1;
ERROR 42000: Incorrect argument type to variable 'innodb_log_page_checksum'
set global innodb_log_page_checksum=1e1;
ERROR 42000: Incorrect argument type to variable 'innodb_log_page_checksum'
set global innodb_log_page_checksum="foo";
ERROR 42000: Variable 'innodb_log_page_checksum' can't be set to the value of 'foo'
SET @@global.innodb_log_page_checksum = @start_global_value;
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