What is the automatic locking strategy for InnoDB and Myisam in MySQL?

What is the automatic locking strategy for InnoDB and Myisam in

RT,MySQL, respectively? When do we need to explicitly add read-write locks?

Mar.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-64f5-1e44a31-43789.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e44a31-43789.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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