How to clean up the contents of journal in mongodb,

how can I delete the files under the journal file of mongodb?
produced a lot of tables before, so some were deleted, but this folder still has more than 60 gigabytes, which is much larger than the size of the existing tables.
how to clean it up?

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Mar.13,2021

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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-64f5-1bec2cd-30820.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bec2cd-30820.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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