What does it mean to configure startup swap?

when I was watching
setting up a mail server , there was a sentence I couldn"t understand:

check whether swap has been started, and configure startup swap if not.

I know there is a swap zone in the Linux server, but what does it mean to start swap here?

Swap linux
Apr.07,2021

this should not be the SWAP partition.

If you do not specify the SWAP partition of

Linux in / etc/fstab or if you have just finished partitioning, you have to enable it yourself. After the partition is formatted into swap, sudo swapon / dev/sdaX is fine.

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Message : Disk full (/tmp/#sql-temptable-64f5-1e4c6b6-44e8e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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