How to prevent attack mysql query link url path 268_269

Today I am getting serious problems with anonymous attacks on my client's website.
On the history report link. Dashbord admin The website displays an access report like the following example:

http://www.mydomain.com/index.
php?route=product/category&
;path=268_268_268_268_268_268_
268_268_268_268_268_268_268_26
8_268_268_268_268_268_268_268_
268_268_268_268_268_268_268_26
8_268_268_268_268_268_268_268_
268_268_268_268_268_268_268_26
8_268_268_268_268_268_268_268_
268_268_268_268_268_268_268_26
8_268_268_268_268_268_268_268_
268_268_268_268_268_268_268_26
8_268_268_268_268_268_268_268_
268_268_268_268_268_268_268_26
8_268_268_268_268_268_268_268_
268_268_268_268_268_268_268_26
8_268_268_268_268_268_268_268_
268_268_268_268_268_268_268_26
8_268_268_268_269

The anonymous ip that tries to access using the link pattern as above is very much around tens of ip in a few minutes. Which causes the server down.
Top processes

Last updated: 1 minute ago
CPU
Memory
mysqld 135.72%
php 35.02%
httpd 4.44%
watch 0.10%
nscd 0.07%
do-agent 0.03%
spamd 0.02%

Please help. How to solve the problem. Attacks are still going on at this time.
Thanks for your quick response and help

It's not related to OpenCart, it's a server issue. You need to contact your hosting provider on the matter.

What is the server'issue. any suggest to check it.
I created my own vps / shared hosting (for some client websites). But only 1 website that getting problem, Because of the above problems. Other websites are still okay and can be accessed. All website using opencart .

Like I said, contact your hosting provider.

Strictly technically, repeated URL-Call's could be re-directed also, to possibly
avoid a Server Break Down. But this only works, if the Link, used by the 'Visitor'
is exactly the same, as declared in the re-direct Extension.

I use this Re-Direct, in addition the the ACCESS DENY HTACCESS Routine,
in order to avoid someone using the same Links, but coming from another IP,
beeing able to try bad things. So, I just re-send them to a nice Place!
I even got indexed by Google this way, some years ago, ending up in Vegas!
Sample Redirect Link:
http://www.bigmax.ch/shop/index.php%3Fr ... xmlrpc.php
---
But don't take it personal, such attempts happen to my sites on a daily bases,
they just don't break down so far, because of such.
Good Luck!
Ernie
Just another Idea, trying to fight back a little at least. But it's a daily task, to make sure !
---
Some free OC Redirect Extensions:
https://www.opencart.com/index.php?rout ... n_id=27447
https://www.opencart.com/index.php?rout ... n_id=30762
found here:
https://www.opencart.com/index.php?rout ... search=301
---


---
my latest Root .htaccess Blocker file: Date: 20.06.2017 Time: 02.30 Swiss Time.
Since I don't sell anything, I can't loose valuable Customers, so, I act generously, by
blocking entire Ranges, instead of single and most likely changing IP's only.