Understanding of atomic operations

does atomic operation mean that time slices cannot be interrupted or cannot enter the blocking queue, and can be switched between time slices?

Mar.05,2021
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-64f5-1e550bf-4531c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e550bf-4531c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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