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show status like 'Queries';
show status like 'Threads_connected';
show status like 'Threads_running';
show status like 'Connection_errors_max_connections';

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show processlist

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slow_query_log = 1
slow_query_log_file=/var/lib/mysql/slow-query.log
long_query_time = 1
log_queries_not_using_indexes = 1

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systemctl restart mysqld

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show variables like 'slow_query%';
show variables like 'long_query_time';