DB Connection error

Hello

I am using WordPress Kuteshop Theme on Nginx+Apche+PHP-CGI (7.3 Latest) ,

Where my VPS Details :
1 CPU
1 GB RAM
25 GB SSD

But The issue is that I am getting error on Fronted

error establishing a database connection

Error Log:

Code: [Select]

# tail -f /usr/local/apache/domlogs/biponialoy.com.error.log
[Tue Sep 15 11:25:52.211453 2020] [:error] [pid 32464:tid 139915227748096] [client 103.134.42.11:48084] PHP Warning:  mysqli_query(): Error reading result set's header in /home/paikari/biponialoy.com/wp-includes/wp-db.php on line 2033, referer: https://www.biponialoy.com/
[Tue Sep 15 11:25:52.209797 2020] [:error] [pid 32464:tid 139915010443008] [client 103.134.42.11:48072] PHP Warning:  mysqli_query(): MySQL server has gone away in /home/paikari/biponialoy.com/wp-includes/wp-db.php on line 2033, referer: https://www.biponialoy.com/wp-admin/post.php?post=7311&action=edit
[Tue Sep 15 11:25:52.212245 2020] [:error] [pid 32464:tid 139915010443008] [client 103.134.42.11:48072] PHP Warning:  mysqli_query(): Error reading result set's header in /home/paikari/biponialoy.com/wp-includes/wp-db.php on line 2033, referer: https://www.biponialoy.com/wp-admin/post.php?post=7311&action=edit
[Tue Sep 15 11:25:52.209807 2020] [:error] [pid 32464:tid 139915261318912] [client 103.134.42.11:48064] PHP Warning:  mysqli_query(): MySQL server has gone away in /home/paikari/biponialoy.com/wp-includes/wp-db.php on line 2033, referer: https://www.biponialoy.com/wp-admin/post.php?post=7311&action=edit
[Tue Sep 15 11:25:52.212366 2020] [:error] [pid 32464:tid 139915261318912] [client 103.134.42.11:48064] PHP Warning:  mysqli_query(): Error reading result set's header in /home/paikari/biponialoy.com/wp-includes/wp-db.php on line 2033, referer: https://www.biponialoy.com/wp-admin/post.php?post=7311&action=edit
[Tue Sep 15 11:25:52.209802 2020] [:error] [pid 32464:tid 139915035621120] [client 103.134.42.11:48080] PHP Warning:  mysqli_query(): MySQL server has gone away in /home/paikari/biponialoy.com/wp-includes/wp-db.php on line 2033, referer: https://www.biponialoy.com/wp-admin/post.php?post=7311&action=edit
[Tue Sep 15 11:25:52.212425 2020] [:error] [pid 32464:tid 139915035621120] [client 103.134.42.11:48080] PHP Warning:  mysqli_query(): Error reading result set's header in /home/paikari/biponialoy.com/wp-includes/wp-db.php on line 2033, referer: https://www.biponialoy.com/wp-admin/post.php?post=7311&action=edit
[Tue Sep 15 11:25:52.209811 2020] [:error] [pid 32464:tid 139915069191936] [client 103.134.42.11:48076] PHP Warning:  mysqli_query(): MySQL server has gone away in /home/paikari/biponialoy.com/wp-includes/wp-db.php on line 2033, referer: https://www.biponialoy.com/wp-admin/post.php?post=7311&action=edit
[Tue Sep 15 11:25:52.212867 2020] [:error] [pid 32464:tid 139915069191936] [client 103.134.42.11:48076] PHP Warning:  mysqli_query(): Error reading result set's header in /home/paikari/biponialoy.com/wp-includes/wp-db.php on line 2033, referer: https://www.biponialoy.com/wp-admin/post.php?post=7311&action=edit
[Tue Sep 15 11:25:52.215043 2020] [:error] [pid 32464:tid 139914993657600] [client 103.134.42.11:48060] PHP Warning:  Error while sending QUERY packet. PID=3806 in /home/paikari/biponialoy.com/wp-includes/wp-db.php on line 2033, referer: https://www.biponialoy.com/wp-admin/post.php?post=7311&action=edit
No huge traffic / visitors .

Any idea ?

Make sure you use the correct DB login credentials.
Also, try to check and repair databases with mysqcheck -A -r