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SET @start_global_value = @@global.innodb_compression_level;
SELECT @start_global_value;
@start_global_value
6
Valid value 0-9
select @@global.innodb_compression_level <= 9;
@@global.innodb_compression_level <= 9
1
select @@global.innodb_compression_level;
@@global.innodb_compression_level
6
select @@session.innodb_compression_level;
ERROR HY000: Variable 'innodb_compression_level' is a GLOBAL variable
show global variables like 'innodb_compression_level';
Variable_name Value
innodb_compression_level 6
show session variables like 'innodb_compression_level';
Variable_name Value
innodb_compression_level 6
select * from information_schema.global_variables where variable_name='innodb_compression_level';
VARIABLE_NAME VARIABLE_VALUE
INNODB_COMPRESSION_LEVEL 6
select * from information_schema.session_variables where variable_name='innodb_compression_level';
VARIABLE_NAME VARIABLE_VALUE
INNODB_COMPRESSION_LEVEL 6
set global innodb_compression_level=2;
select @@global.innodb_compression_level;
@@global.innodb_compression_level
2
select * from information_schema.global_variables where variable_name='innodb_compression_level';
VARIABLE_NAME VARIABLE_VALUE
INNODB_COMPRESSION_LEVEL 2
select * from information_schema.session_variables where variable_name='innodb_compression_level';
VARIABLE_NAME VARIABLE_VALUE
INNODB_COMPRESSION_LEVEL 2
set session innodb_compression_level=4;
ERROR HY000: Variable 'innodb_compression_level' is a GLOBAL variable and should be set with SET GLOBAL
set global innodb_compression_level=1.1;
ERROR 42000: Incorrect argument type to variable 'innodb_compression_level'
set global innodb_compression_level=1e1;
ERROR 42000: Incorrect argument type to variable 'innodb_compression_level'
set global innodb_compression_level="foo";
ERROR 42000: Incorrect argument type to variable 'innodb_compression_level'
set global innodb_compression_level=10;
Warnings:
Warning 1292 Truncated incorrect innodb_compression_level value: '10'
select @@global.innodb_compression_level;
@@global.innodb_compression_level
9
select * from information_schema.global_variables where variable_name='innodb_compression_level';
VARIABLE_NAME VARIABLE_VALUE
INNODB_COMPRESSION_LEVEL 9
set global innodb_compression_level=-7;
Warnings:
Warning 1292 Truncated incorrect innodb_compression_level value: '-7'
select @@global.innodb_compression_level;
@@global.innodb_compression_level
0
select * from information_schema.global_variables where variable_name='innodb_compression_level';
VARIABLE_NAME VARIABLE_VALUE
INNODB_COMPRESSION_LEVEL 0
set global innodb_compression_level=0;
select @@global.innodb_compression_level;
@@global.innodb_compression_level
0
set global innodb_compression_level=9;
select @@global.innodb_compression_level;
@@global.innodb_compression_level
9
SET @@global.innodb_compression_level = @start_global_value;
SELECT @@global.innodb_compression_level;
@@global.innodb_compression_level
6
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