The node, request timeout increased gradually, and the service could not be provided at last.

the middle tier I started with node (koa) has a lot of timeouts from the very beginning. I wrote the timeout control myself. At first, I wrote the timeout, then the request grew, the timeout also increased, and finally I reached several hours, and then I couldn"t access it. The node requests could not be returned, and I couldn"t find out any reason with the memory leak monitoring package. I asked where I should start to solve the problem. What may be the cause of this?

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-64f5-1b2bee3-2bae8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2bee3-2bae8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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