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oracle 11g “密码延迟验证”特性
2022-07-26 03:33:00 【51CTO】
实验目标:测试oracle 11g “密码延迟验证”特性.
Oracle 11g引入了“密码延迟验证”的新特性,如果输入错误的密码登录,随着错误密码登录次数的增加,每次登录前验证的时间相应也会增加,此功能目的在于避免黑客将数据库密码攻破.
但对于正常系统,由于口令的更改,特别是从10g(默认密码不区分大小写)升级到11g(默认密码区分大小写),客户端不断重复错误密码尝试登陆,此时就会引起数据库内部长时间的Library Cache Lock等待,这种异常状态在生产环境并不少见.
以下模拟该场景:
数据库:oracle 11.2.0.4
实验环境一个session尚且这样,若是生产环境,成百上千的session都使用错误的密码连接过来,就会造成严重的Library Cache Lock的等待事件. 前端用户使用错误密码登录过多,就会导致输入正确的密码也需要等待很久,感觉就是数据库hang住.不过该账号一旦输入正确密码,延时就会清0.
遇到该问题,可以通过event 28401关闭该特性:
说明:参数SEC_CASE_SENSITIVE_LOGON控制密码大小写敏感
参考网址: https://blog.csdn.net/zhang123456456/article/details/80983352
Mos文档:【Doc ID 1309738.1】
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