# Saving initial value of stored_program_cache in a temporary variable
SET @start_value = @@global.stored_program_cache;
SELECT @start_value;
@start_value
256
# Display the DEFAULT value of stored_program_cache
SET @@global.stored_program_cache  = DEFAULT;
SELECT @@global.stored_program_cache;
@@global.stored_program_cache
256
# Verify default value of variable
SELECT @@global.stored_program_cache  = 256;
@@global.stored_program_cache  = 256
1
# Change the value of stored_program_cache to a valid value
SET @@global.stored_program_cache  = 512;
SELECT @@global.stored_program_cache;
@@global.stored_program_cache
512
# Change the value of stored_program_cache to invalid value
SET @@global.stored_program_cache  = -1;
Warnings:
Warning	1292	Truncated incorrect stored_program_cache value: '-1'
SELECT @@global.stored_program_cache;
@@global.stored_program_cache
256
SET @@global.stored_program_cache =100000000000;
Warnings:
Warning	1292	Truncated incorrect stored_program_cache value: '100000000000'
SELECT @@global.stored_program_cache;
@@global.stored_program_cache
524288
SET @@global.stored_program_cache = 0;
Warnings:
Warning	1292	Truncated incorrect stored_program_cache value: '0'
SELECT @@global.stored_program_cache;
@@global.stored_program_cache
256
SET @@global.stored_program_cache = 10000.01;
ERROR 42000: Incorrect argument type to variable 'stored_program_cache'
SET @@global.stored_program_cache = ON;
ERROR 42000: Incorrect argument type to variable 'stored_program_cache'
SET @@global.stored_program_cache= 'test';
ERROR 42000: Incorrect argument type to variable 'stored_program_cache'
SET @@global.stored_program_cache = '';
ERROR 42000: Incorrect argument type to variable 'stored_program_cache'
# Test if accessing session stored_program_cache gives error
SET @@session.stored_program_cache = 0;
ERROR HY000: Variable 'stored_program_cache' is a GLOBAL variable and should be set with SET GLOBAL
# Check if accessing variable without SCOPE points to same global variable
SET @@global.stored_program_cache = 512;
SELECT @@stored_program_cache = @@global.stored_program_cache;
@@stored_program_cache = @@global.stored_program_cache
1
# Restore initial value
SET @@global.stored_program_cache = @start_value;
SELECT @@global.stored_program_cache;
@@global.stored_program_cache
256