详解MySQL 表中非主键列溢出情况监控_Mysql_

 SELECT cast( pow(2, case data_type when 'tinyint' then 7 when 'smallint' then 15 when 'mediumint' then 23 when 'int' then 31 when 'bigint' then 63 end+(column_type like '% unsigned'))-1 as decimal(30,0)) as max_int, ' - ', concat ('(', concat('select ','max(',COLUMN_NAME,')',' from ',TABLE_SCHEMA,'.',TABLE_NAME),')') from information_schema.COLUMNS where TABLE_SCHEMA NOT IN ('information_schema','sys','test','mysql','performance_schema') AND DATA_TYPE IN ('int' ) ;

 #!/bin/bash # 监测int类型的当可用空间少500w的时候，提醒做DDL操作 # 设置 session级别的 max_execution_time为2秒，防止没有索引的大的拖慢数据库，但是这样可能漏判部分列，需要注意下 # 注意：我这里bigint类型的没有检查，如果需要请修改 check.sql where条件中的DATA_TYPE加上 bigint的检查 source /etc/profile set -u mkdir $(date +%F) -pv # step1 检测 for host in {'192.168.1.100','192.168.1.110','192.168.1.120','192.168.1.130'}; do mysql -udts -pdts -h${host} -BN < check.sql 2>/dev/null > sql.log wait echo "说明： | 当前列允许的最大值 | 巡检用的SQL " >> $(date +%F)/$host.log while read line; do ret=$(mysql -udts -pdts -h${host} -BNe "set session max_execution_time=2000;select $line" 2>/dev/null) echo ${ret} if [[ "${ret}" == "NULL" ]]; then continue fi if [ ${ret} -lt 5000000 ] ; then echo "$line 剩余空间 ${ret}, 该表可用水位不足500W，建议做DDL修改为bigint类型" >> $(date +%F)/$host.log fi done < ./sql.log done # step2 将检查的内容打包发邮件（这里可能需要根据自己生产的情况改改） tar czf $(date +%F).tar.gz $(date +%F) sendemail -s 192.168.1.200 -f post@domain.com -t ergou@domain.com -a $(date +%F).tar.gz -u "$(date +%F) int水位线巡检日志" -o message-content-type=html -o message-charset=utf8 -m "内容详见附件" # step3 清理每日生成的以日期命名的目录和tar.gz文件，这里我就不贴命令