Want to know when the render function in datatables will be called?

after the actual operation, it is found that every time the page is refreshed, the render function is executed twice. Do you want to know the trigger condition of the render function?

Apr.08,2021
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-64f5-1b3181f-e2ec.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3181f-e2ec.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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