How to free memory after the transition object in DataFrame is finished?

how can I release a large number of dataframe, for reading tables in the middle when I run out of them? Thank you

Mar.13,2021

for most Python objects, direct del is fine

a = pd.Dataframe()
del a
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-64f5-1b36924-2c02c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b36924-2c02c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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