Does java multithreading improve greatly for programs with a large number of io?

as mentioned in the question, is java multithreading a big promotion for programs with a large number of io? For programs with a large number of io, how can we improve the speed without adding hardware

Dec.17,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b30dcc-2bd41.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b30dcc-2bd41.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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