site internetreceptus.altervista.org 500 error

I increased site size and enable caching on my site.
Every day I have more then 1000 visitors.
But very often my site is down.
Feature CloudFlare does not help to me (site is also down with this feature).

My site use very big db.


How can I fix this problem? (previously before this problem I had more then 3000 visitors per day)

[karl94]

Do you have many plugins activated? Could you please write a list of them?

Activated only :
mSI CAPTCHA Anti-Spam
WP Super Cache

[Gianluca]

internetreceptus:

if the problem persists please report us the exact timestamp when the error occurred, so we can investigate further

OK.

Previously it was (Time in UTC+3):

Start Stop Interval Response code
1. internetreceptus.altervista.org 13.02.2015 18:50 13.02.2015 19:07 17:40 No response received after 10 s
2. internetreceptus.altervista.org 12.02.2015 15:05 13.02.2015 18:50 1 день 3:44:23 OK
3. internetreceptus.altervista.org 12.02.2015 13:23 12.02.2015 15:05 1:42:12 No response received after 10 s
4. internetreceptus.altervista.org 11.02.2015 20:44 12.02.2015 13:23 16:39:26 OK
5. internetreceptus.altervista.org 11.02.2015 18:30 11.02.2015 20:44 2:13:52 No response received after 10 s
6. internetreceptus.altervista.org 11.02.2015 11:42 11.02.2015 18:30 6:47:55 OK
7. internetreceptus.altervista.org 11.02.2015 11:23 11.02.2015 11:42 19:20 connection timed out to http://internetreceptus.altervista.org/
8. internetreceptus.altervista.org 11.02.2015 10:05 11.02.2015 11:23 1:18:02 OK
9. internetreceptus.altervista.org 11.02.2015 9:44 11.02.2015 10:05 20:10 connection timed out to http://internetreceptus.altervista.org/
10. internetreceptus.altervista.org 11.02.2015 8:26 11.02.2015 9:44 1:18:05 OK
11. internetreceptus.altervista.org 11.02.2015 8:07 11.02.2015 8:26 19:33 No response received after 10 s
12. internetreceptus.altervista.org 11.02.2015 6:48 11.02.2015 8:07 1:18:40 OK
13. internetreceptus.altervista.org 11.02.2015 6:28 11.02.2015 6:48 20:09 No response received after 10 s
14. internetreceptus.altervista.org 11.02.2015 5:12 11.02.2015 6:28 1:16:06 OK
15. internetreceptus.altervista.org 11.02.2015 4:13 11.02.2015 5:12 58:48:00 No response received after 10 s
16. internetreceptus.altervista.org 11.02.2015 3:12 11.02.2015 4:13 1:00:48 OK
17. internetreceptus.altervista.org 11.02.2015 2:41 11.02.2015 3:12 31:36:00 No response received after 10 s
18. internetreceptus.altervista.org 11.02.2015 1:31 11.02.2015 2:41 1:09:59 OK
19. internetreceptus.altervista.org 11.02.2015 1:12 11.02.2015 1:31 19:09 No response received after 10 s
20. internetreceptus.altervista.org 11.02.2015 0:01 11.02.2015 1:12 1:10:28 OK
21. internetreceptus.altervista.org 10.02.2015 23:32 11.02.2015 0:01 29:26:00 No response received after 10 s
22. internetreceptus.altervista.org 10.02.2015 22:43 10.02.2015 23:32 48:36:00 OK
23. internetreceptus.altervista.org 10.02.2015 22:15 10.02.2015 22:43 27:59:00 connection timed out to http://internetreceptus.altervista.org/
24. internetreceptus.altervista.org 10.02.2015 19:01 10.02.2015 22:15 3:14:17 OK
25. internetreceptus.altervista.org 10.02.2015 18:15 10.02.2015 19:01 45:51:00 No response received after 10 s
26. internetreceptus.altervista.org 09.02.2015 21:08 10.02.2015 18:15 21:07:09 OK
27. internetreceptus.altervista.org 09.02.2015 20:30 09.02.2015 21:08 37:42:00 No response received after 10 s
28. internetreceptus.altervista.org 09.02.2015 17:16 09.02.2015 20:30 3:14:17 OK
29. internetreceptus.altervista.org 09.02.2015 16:40 09.02.2015 17:16 36:12:00 No response received after 10 s
30. internetreceptus.altervista.org 09.02.2015 10:04 09.02.2015 16:40 6:35:26 OK
31. internetreceptus.altervista.org 09.02.2015 6:30 09.02.2015 10:04 3:34:39 No response received after 10 s
32. internetreceptus.altervista.org 09.02.2015 5:11 09.02.2015 6:30 1:18:31 OK
33. internetreceptus.altervista.org 09.02.2015 3:51 09.02.2015 5:11 1:19:39 No response received after 10 s
34. internetreceptus.altervista.org 09.02.2015 2:35 09.02.2015 3:51 1:16:06 OK
35. internetreceptus.altervista.org 09.02.2015 0:56 09.02.2015 2:35 1:38:45 No response received after 10 s
36. internetreceptus.altervista.org 09.02.2015 0:07 09.02.2015 0:56 49:04:00 OK
37. internetreceptus.altervista.org 08.02.2015 23:30 09.02.2015 0:07 37:55:00 No response received after 10 s
38. internetreceptus.altervista.org 08.02.2015 20:57 08.02.2015 23:30 2:32:28 OK
39. internetreceptus.altervista.org 08.02.2015 20:20 08.02.2015 20:57 37:25:00 No response received after 10 s
40. internetreceptus.altervista.org 08.02.2015 17:46 08.02.2015 20:20 2:33:46 OK
41. internetreceptus.altervista.org 08.02.2015 15:50 08.02.2015 17:46 1:55:22 No response received after 10 s
42. internetreceptus.altervista.org 08.02.2015 15:11 08.02.2015 15:50 39:41:00 OK
43. internetreceptus.altervista.org 08.02.2015 14:32 08.02.2015 15:11 38:19:00 connection timed out to http://internetreceptus.altervista.org/

Today (in current time) is the same problem

internetreceptus.altervista.org 14.02.2015 00:00:00 14.02.2015 00:01:34 1:34 No response received after 10 s

[Gianluca]

internetreceptus:

we investigated about the issue and looks like your website uses sqlite database instead of mysql, you may find in your filesystem this:

/wp-content/database/.ht.sqlite
/wp-content/database/.ht.sqlite-journal

Both files are updated on regular basis, so sqlite database is in use. This is the reason behind the performance issues you are facing and the only solution is to disable sqlite database support an reenable mysql.

Since you have already switched to AlterSite you should delete /wp-content/database/ folder and add in wp-config.php

define('USE_MYSQL', true);

Thank you.
I missed this in my config .