Hi @nguyenlephuong1525, in that case it could be possible that there is a very large row.
In order to find the problematic rows, you could try this in MySQL:
SELECT option_id, option_name, LENGTH(option_value) AS length FROM wp_options WHERE LENGTH(option_value) > 5000 ORDER BY length DESC LIMIT 500;
Please let us know if you see any table with an abnormal length. A fresh installation of WordPress only has columns with less than 4000 characters.
If you do see one, ensure it is not essential to WordPress, you could also share it with us.
You can then delete it with this command (changing ID by the problematic option_id value, ensure the name is correct with a SELECT statement before deleting):
SELECT option_name FROM wp_options WHERE option_id = ID;
DELETE FROM wp_options WHERE option_id = ID;
Ensure it shows an output like this:
Query OK, 1 row affected (0.00 sec)