背景：今天使用mysqlslap壓測性能，並發數是100就開始報錯，錯誤如圖
運行的腳本：
mysqlslap -h172.xx.xx.xx -P9030 -uxx --concurrency=100 --iterations=1 --create-schema=bds --query=/home/zhangjun/test.sql --engine=innodb --number-of-queries=1 --debug-info
錯誤提示：
解決方案：
設置用戶最大連接數，解決此問題
mysqlslap: Error when connecting to server: 1064 Reach limit of connections
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