This is NOT an error and it tells you so. It is a precautionary warning. It tells you exactly what's going on; at least one of your database records is more than 1 MiB big which may be a bit too big for some common configuration of the database server.
If your database restoration fails you should contact your host, pasting them the message you highlighted in your screenshot, as per the instructions of the message you highlighted in your screenshot.
Basically, I am telling you to actually read the message you pasted and follow its instructions. It's in plain English. It tells you what to do and when.
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!