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SET @start_global_value = @@global.old_alter_table;
SELECT @start_global_value;
@start_global_value
DEFAULT
select @@global.old_alter_table;
@@global.old_alter_table
DEFAULT
select @@session.old_alter_table;
@@session.old_alter_table
DEFAULT
show global variables like 'old_alter_table';
Variable_name Value
old_alter_table DEFAULT
show session variables like 'old_alter_table';
Variable_name Value
old_alter_table DEFAULT
select * from information_schema.global_variables where variable_name='old_alter_table';
VARIABLE_NAME VARIABLE_VALUE
OLD_ALTER_TABLE DEFAULT
select * from information_schema.session_variables where variable_name='old_alter_table';
VARIABLE_NAME VARIABLE_VALUE
OLD_ALTER_TABLE DEFAULT
set global old_alter_table=1;
set session old_alter_table=1;
select @@global.old_alter_table;
@@global.old_alter_table
COPY
select @@session.old_alter_table;
@@session.old_alter_table
COPY
show global variables like 'old_alter_table';
Variable_name Value
old_alter_table COPY
show session variables like 'old_alter_table';
Variable_name Value
old_alter_table COPY
select * from information_schema.global_variables where variable_name='old_alter_table';
VARIABLE_NAME VARIABLE_VALUE
OLD_ALTER_TABLE COPY
select * from information_schema.session_variables where variable_name='old_alter_table';
VARIABLE_NAME VARIABLE_VALUE
OLD_ALTER_TABLE COPY
set global old_alter_table=2;
set session old_alter_table=2;
select @@global.old_alter_table;
@@global.old_alter_table
INPLACE
select @@session.old_alter_table;
@@session.old_alter_table
INPLACE
show global variables like 'old_alter_table';
Variable_name Value
old_alter_table INPLACE
show session variables like 'old_alter_table';
Variable_name Value
old_alter_table INPLACE
select * from information_schema.global_variables where variable_name='old_alter_table';
VARIABLE_NAME VARIABLE_VALUE
OLD_ALTER_TABLE INPLACE
select * from information_schema.session_variables where variable_name='old_alter_table';
VARIABLE_NAME VARIABLE_VALUE
OLD_ALTER_TABLE INPLACE
set global old_alter_table=3;
set session old_alter_table=3;
select @@global.old_alter_table;
@@global.old_alter_table
NOCOPY
select @@session.old_alter_table;
@@session.old_alter_table
NOCOPY
show global variables like 'old_alter_table';
Variable_name Value
old_alter_table NOCOPY
show session variables like 'old_alter_table';
Variable_name Value
old_alter_table NOCOPY
select * from information_schema.global_variables where variable_name='old_alter_table';
VARIABLE_NAME VARIABLE_VALUE
OLD_ALTER_TABLE NOCOPY
select * from information_schema.session_variables where variable_name='old_alter_table';
VARIABLE_NAME VARIABLE_VALUE
OLD_ALTER_TABLE NOCOPY
set global old_alter_table=4;
set session old_alter_table=4;
select @@global.old_alter_table;
@@global.old_alter_table
INSTANT
select @@session.old_alter_table;
@@session.old_alter_table
INSTANT
show global variables like 'old_alter_table';
Variable_name Value
old_alter_table INSTANT
show session variables like 'old_alter_table';
Variable_name Value
old_alter_table INSTANT
select * from information_schema.global_variables where variable_name='old_alter_table';
VARIABLE_NAME VARIABLE_VALUE
OLD_ALTER_TABLE INSTANT
select * from information_schema.session_variables where variable_name='old_alter_table';
VARIABLE_NAME VARIABLE_VALUE
OLD_ALTER_TABLE INSTANT
set global old_alter_table=1.1;
ERROR 42000: Incorrect argument type to variable 'old_alter_table'
set global old_alter_table=1e1;
ERROR 42000: Incorrect argument type to variable 'old_alter_table'
set global old_alter_table="foo";
ERROR 42000: Variable 'old_alter_table' can't be set to the value of 'foo'
SET @@global.old_alter_table = @start_global_value;
SELECT @@global.old_alter_table;
@@global.old_alter_table
DEFAULT
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