有时候早期建的表上可能缺少主键，这样容易导致查询或者主从复制比较慢。

下面是一个小的脚本，用于找出没有主键的表。

#!/bin/bash

# 找出没有主键的表

# Date: 2017/06/05

source /etc/profile

LOG="/tmp/nopk.log_$(date +%F)"

user=‘root‘

host=‘localhost‘

pass=‘123456‘

sock=‘/tmp/mysql.sock‘

MYSQL_CMD="mysql -u$user -h$host -p$pass -S$sock"

dbs=$($MYSQL_CMD 2>/dev/null -BNe "select SCHEMA_NAME from information_schema.SCHEMATA where SCHEMA_NAME not in (‘information_schema‘,‘performance_schema‘)")

for db in $dbs; do 

$MYSQL_CMD information_schema 2>/dev/null -NBe "select distinct TABLE_SCHEMA,table_name from columns where  TABLE_SCHEMA = ‘$db‘ and table_name not in ( select distinct table_name from COLUMNS  where TABLE_SCHEMA = ‘$db‘ and (column_key  = ‘PRI‘ or column_key = ‘UNI‘) )" | tee -a $LOG

done

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脚本找出mysql中缺少主键的表