I have a WordPress production website.
I\'ve exported the database by the following commands: select database > export > custom > select all tables &g
Compress your .sql file, and make sure to name it .[format].[compression], i.e.
database.sql.zip.
As noted above, PhpMyAdmin throws this error if your .sql file is larger than the Maximum allowed upload size -- but, in my case the maximum was 50MiB despite that I had set all options noted in previous answers (look for the "Max: 50MiB" next to the upload button in PhpMyAdmin).