1040
MySQLERRORNotableConnectionHIGH confidence
Too many connections — additional context
What this means
ER_CON_COUNT_ERROR (1040) is returned when the server's max_connections limit is reached and no new connections can be accepted.
How to reproduce
trigger — this will error
trigger — this will error
-- Current usage: SHOW STATUS LIKE 'Threads_connected'; SHOW VARIABLES LIKE 'max_connections';
expected output
ERROR 1040 (HY000): Too many connections
Fix
Use a connection pool and increase max_connections
WHEN When the application opens too many direct connections.
Use a connection pool and increase max_connections
SET GLOBAL max_connections = 500; -- Or in my.cnf: max_connections = 500
Why this works
Connection pools reuse connections rather than opening new ones per request. Increasing max_connections provides headroom but pooling is the real fix.
What not to do
✕ Set max_connections to a very large value
Each connection consumes ~1MB of RAM; extremely high values can exhaust memory and cause OOM crashes.
Sources
Official documentation ↗
MySQL 8.0 Error Reference — 1040 ER_CON_COUNT_ERROR
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