Mega Code Archive
Global System Variables versus System Variables at the Connection Level
SELECT @@wait_timeout -- Session (connection level)
SELECT @@session.wait_timeout -- Session (connection level)
SELECT @@global.wait_timeout -- Global
SET @@wait_timeout = 10000 -- Session (connection level)
SET @@session.wait_timeout = 10000 -- Session (connection level)
SET SESSION wait_timeout = 10000 -- Session (connection level)
SET @@global.wait_timeout = 10000 -- Global
SET GLOBAL wait_timeout = 10000 -- Global