Login as root user to your MySQLd and run this statement:
show variables like "max_connections";
Result would look something like this:
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| max_connections | 100   |
+-----------------+-------+
Increase that number to allow more concurrent connections, for example run this statement:
set global max_connections = 200;

To make this change permanent, locate your my.cnf file (often in /etc or /etc/mysql) and add this under the [mysqld] section:
max_connections = 200
After a restart of the mysqld service this setting will be the new default.

Or maybe try a tool like mysqltuner.pl to find the optimised advised configuration setting for the max_connection limit:
https://github.com/major/MySQLTuner-perl

Jacek Dąbrowski via observium wrote at 2019-09-02 10:54:

Hello,

 

Yesterday I turned off Observium after turning on the message DB Error 1040 appears, which I can do with it ???

 

 

 

Pozdrawiam

Jacek Dąbrowski

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