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SET @start_global_value = @@global.maria_pagecache_age_threshold;
select @@global.maria_pagecache_age_threshold, @@global.aria_pagecache_age_threshold;
@@global.maria_pagecache_age_threshold @@global.aria_pagecache_age_threshold
300 300
select @@session.maria_pagecache_age_threshold, @@session.aria_pagecache_age_threshold;
ERROR HY000: Variable 'maria_pagecache_age_threshold' is a GLOBAL variable
show global variables like '%aria_pagecache_age_threshold';
Variable_name Value
aria_pagecache_age_threshold 300
maria_pagecache_age_threshold 300
show session variables like '%aria_pagecache_age_threshold';
Variable_name Value
aria_pagecache_age_threshold 300
maria_pagecache_age_threshold 300
select * from information_schema.global_variables where variable_name like '%aria_pagecache_age_threshold';
VARIABLE_NAME VARIABLE_VALUE
ARIA_PAGECACHE_AGE_THRESHOLD 300
MARIA_PAGECACHE_AGE_THRESHOLD 300
select * from information_schema.session_variables where variable_name like '%aria_pagecache_age_threshold';
VARIABLE_NAME VARIABLE_VALUE
ARIA_PAGECACHE_AGE_THRESHOLD 300
MARIA_PAGECACHE_AGE_THRESHOLD 300
set global maria_pagecache_age_threshold=200;
select @@global.maria_pagecache_age_threshold, @@global.aria_pagecache_age_threshold;
@@global.maria_pagecache_age_threshold @@global.aria_pagecache_age_threshold
200 200
set session maria_pagecache_age_threshold=1;
ERROR HY000: Variable 'maria_pagecache_age_threshold' is a GLOBAL variable and should be set with SET GLOBAL
set global maria_pagecache_age_threshold=1.1;
ERROR 42000: Incorrect argument type to variable 'maria_pagecache_age_threshold'
set global maria_pagecache_age_threshold=1e1;
ERROR 42000: Incorrect argument type to variable 'maria_pagecache_age_threshold'
set global maria_pagecache_age_threshold="foo";
ERROR 42000: Incorrect argument type to variable 'maria_pagecache_age_threshold'
set global maria_pagecache_age_threshold=1;
Warnings:
Warning 1292 Truncated incorrect aria_pagecache_age_threshold value: '1'
select @@global.maria_pagecache_age_threshold, @@global.aria_pagecache_age_threshold;
@@global.maria_pagecache_age_threshold @@global.aria_pagecache_age_threshold
100 100
set global maria_pagecache_age_threshold=@@global.maria_pagecache_age_threshold + 100 - 1;
Warnings:
Warning 1292 Truncated incorrect aria_pagecache_age_threshold value: '199'
select @@global.maria_pagecache_age_threshold, @@global.aria_pagecache_age_threshold;
@@global.maria_pagecache_age_threshold @@global.aria_pagecache_age_threshold
100 100
set global maria_pagecache_age_threshold=@@global.maria_pagecache_age_threshold + 100;
select @@global.maria_pagecache_age_threshold, @@global.aria_pagecache_age_threshold;
@@global.maria_pagecache_age_threshold @@global.aria_pagecache_age_threshold
200 200
set global maria_pagecache_age_threshold=cast(-1 as unsigned int);
Warnings:
Warning 1292 Truncated incorrect aria_pagecache_age_threshold value: '18446744073709551615'
select @@global.maria_pagecache_age_threshold, @@global.aria_pagecache_age_threshold;
@@global.maria_pagecache_age_threshold @@global.aria_pagecache_age_threshold
18446744073709551600 18446744073709551600
SET @@global.maria_pagecache_age_threshold = @start_global_value;
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