# Variable name: innodb_purge_threads
# Scope: Global
# Access type: Static
# Data type: numeric

--source include/have_innodb.inc

SELECT COUNT(@@GLOBAL.innodb_purge_threads);
--echo 1 Expected

SELECT COUNT(@@innodb_purge_threads);
--echo 1 Expected

SET @save_threads = @@GLOBAL.innodb_purge_threads;

SET @@GLOBAL.innodb_purge_threads=-1;
SELECT @@GLOBAL.innodb_purge_threads;
SET @@GLOBAL.innodb_purge_threads=0;
SELECT @@GLOBAL.innodb_purge_threads;
SET @@GLOBAL.innodb_purge_threads=33;
SELECT @@GLOBAL.innodb_purge_threads;

SET @@GLOBAL.innodb_purge_threads=1;
SET @@GLOBAL.innodb_purge_threads=32;

--Error ER_BAD_FIELD_ERROR
SELECT innodb_purge_threads = @@SESSION.innodb_purge_threads;
--echo Expected error 'Read-only variable'

--disable_warnings
SELECT @@GLOBAL.innodb_purge_threads = VARIABLE_VALUE
FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
WHERE VARIABLE_NAME='innodb_purge_threads';
--enable_warnings
--echo 1 Expected

--disable_warnings
SELECT COUNT(VARIABLE_VALUE)
FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES 
WHERE VARIABLE_NAME='innodb_purge_threads';
--enable_warnings
--echo 1 Expected

SELECT @@innodb_purge_threads = @@GLOBAL.innodb_purge_threads;
--echo 1 Expected

--Error ER_INCORRECT_GLOBAL_LOCAL_VAR
SELECT COUNT(@@local.innodb_purge_threads);
--echo Expected error 'Variable is a GLOBAL variable'

--Error ER_INCORRECT_GLOBAL_LOCAL_VAR
SELECT COUNT(@@SESSION.innodb_purge_threads);
--echo Expected error 'Variable is a GLOBAL variable'

# Check the default value
--disable_warnings
SELECT VARIABLE_NAME, VARIABLE_VALUE
FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
WHERE VARIABLE_NAME = 'innodb_purge_threads';
--enable_warnings


SET GLOBAL innodb_purge_threads = @save_threads;