Overload and server down

Hi @laserstore,
in v4.5.2 nothing major has been changed that can cause a server breakdown. Personally have been using v4.5.2 across many servers and haven’t faced any such issues. It is impossible to track down what’s causing it just by looking at your message. You should look into your server logs and checks what’s causing that. Then we can dig deeper to see the actual reason. Without any logs of what’s causing it is impossible to track it down. Please look into the server logs and check what’s causing it.

@isaumya thank you for your response!
I am currently doing tests on several aspects to find out why this is happening, if there is any incompatibility with plugins or any other error. I need to wait for a low visitation time to do a new test, so until tomorrow I will come back here with better answers.
Thanks a lot!

@isaumya hi there!
Yesterday I managed to redo everything again. Two things could be bringing the server down, the preload that all sitemaps and menus were on, or the Auto prefetch URLs in viewport option which is now disabled. I see no reason for that,
but it may also have been resolved by the simple fact that you have disabled all plugins on the site and have enabled them one by one again. I’m definitely not sure what the cause of the problem is and I appreciate your help! Congratulations on the excellent work!

I am certain it was the preload that all sitemaps and menus were on. If you have a high traffic site, you don’t need the preload all sitemap option as that option will literally hit every single one of the pages in the sitemap which could easily increase server load.

Hi @isaumya !
after many tests, I haven’t found the real problem that occurs. Often when clearing the cache, the server goes down. Even deactivating the preload, this happens. Do you have any tips on what could be happening?

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This says that the problem is with your database connection. Aldo do you have a very big site, if so, you can try disabling the fallback cache and try. Let me know if that happens again.

@isaumya The fallback cache is disabled. Everything works fine at that point. Thanks again for the support!

Let me know if you encounter the server overload error again.

Hi there! @isaumya
After having done all the procedures you recommended, I tried even more, like using another cache plugin together and many other settings. In all of them I had problems with the website crash. So I deactivated Railgun in the Cloudflare panel and the problem seems to have been solved, even the admin panel has become faster.
Apparently there was an error in the communication and I only realized this because I did countless tests on another site and the errors did not occur, but this second site did not have the option of Railgun in the Cloudflare panel available. So as it was the only difference between the two, I decided to disable and voilá!
I appreciate your help and I hope this can help others who have a similar problem.

Thank you so much @laserstore for sharing your findings. Really appreciate it.