Why does the request lose the packet, and how to verify whether the packet is lost?

Why did the request lose the packet, and how to verify whether the packet was lost?

Apr.07,2021

Network conditions can cause packet loss

if there is an error in the request, there will naturally be an error return code at the bottom, try,catch. If the packet is lost, either the network card will be resent, and you can't verify it. You can only know whether the request has been completed. If it is a complete packet loss, it may be an error such as host unResolved

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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-64f5-1b37605-2c080.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b37605-2c080.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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