MySQL數(shù)據(jù)庫是廣泛應(yīng)用于互聯(lián)網(wǎng)公司的重要數(shù)據(jù)存儲(chǔ)和管理工具，因此一旦數(shù)據(jù)庫出現(xiàn)故障或異常，都會(huì)對(duì)企業(yè)的業(yè)務(wù)和用戶的體驗(yàn)造成不良影響。為了保證MySQL數(shù)據(jù)庫的正常性和穩(wěn)定性，我們需要引入報(bào)警機(jī)制。

MySQL報(bào)警機(jī)制可以在數(shù)據(jù)庫出現(xiàn)問題時(shí)及時(shí)通知相關(guān)人員，讓運(yùn)維人員能夠快速發(fā)現(xiàn)和解決問題。下面我們將介紹一下如何使用Python編寫一個(gè)基于MySQL日志的報(bào)警腳本：

import pymysql
import os
import time
import smtplib
from email.mime.text import MIMEText
from datetime import datetime
# MySQL連接信息
MYSQL_USER = 'root'
MYSQL_PASSWD = 'password'
MYSQL_DB = 'database'
MYSQL_HOST = 'localhost'
# 連接MySQL數(shù)據(jù)庫
db = pymysql.connect(host=MYSQL_HOST, port=3306, user=MYSQL_USER, passwd=MYSQL_PASSWD, db=MYSQL_DB)
# 設(shè)置報(bào)警閾值
THRESHOLD = 100
# 記錄每分鐘的連接數(shù)
def get_connections():
sql = 'SHOW GLOBAL STATUS like "Connections"'
cursor = db.cursor()
cursor.execute(sql)
res = dict(cursor.fetchall())
return int(res['Connections'])
# 發(fā)送郵件
def sendemail(title, content):
mail_host = "smtp.qq.com"
mail_user = "example@qq.com"
mail_password = "password"
sender = 'example@qq.com'
receivers = ['example1@qq.com', 'example2@qq.com']
message = MIMEText(content, 'plain', 'utf-8')
message['From'] = sender
message['To'] = ";".join(receivers)
message['Subject'] = title
try:
smtpObj = smtplib.SMTP_SSL(mail_host)
smtpObj.login(mail_user, mail_password)
smtpObj.sendmail(sender, receivers, message.as_string())
print("郵件發(fā)送成功")
except smtplib.SMTPException as e:
print("Error: 郵件發(fā)送失敗")
print(e)
# 主函數(shù)
def main():
while True:
# 獲取每分鐘的連接數(shù)
now = datetime.now()
conn = get_connections()
print('[%s] connections: %d' % (now.strftime('%Y-%m-%d %H:%M:%S'), conn))
# 如果連接數(shù)超過閾值，則發(fā)送郵件報(bào)警
if conn >THRESHOLD:
print('connections exceed the threshold')
title = 'MySQL Connection Alert'
content = 'MySQL連接數(shù)超過閾值：' + str(THRESHOLD) + '，當(dāng)前連接數(shù)為：' + str(conn)
sendemail(title, content)
time.sleep(60)
if __name__ == '__main__':
main()

通過以上腳本的運(yùn)行，我們可以實(shí)時(shí)監(jiān)控MySQL的連接數(shù)，并在連接數(shù)超過設(shè)定閾值時(shí)及時(shí)發(fā)送郵件報(bào)警，快速處理數(shù)據(jù)庫異常，保證企業(yè)業(yè)務(wù)的正常運(yùn)作。