Reply from Free Web Hosting 000webhost.com
Thank you for the time you took to share your experience with us. Our team is eager to clarify any misunderstandings that may have arisen.
Indeed, we implemented some limits to ensure that we can provide our users with free services to kick off their online projects, one of them being limits for the number of concurrent MySQL connections (15000 max queries per hour). A cooldown is needed to reaccess your database and website if this number is exceeded.
To avoid exceeding max queries per hour, there are a few options. You can optimize your queries, simplify them, or upgrade to Hostinger to avoid this limit overall.
For more information about our database rate limitations, head over here: www.000webhost.com/forum/t/database-rate-limiting-policy-free-plans/73635.