出處 Http://yangtingkun.net/?p=1429
又是一个11g新特性导致的问题。
这个新特性很早之前就研究过,也在其他客户处碰到过类似的问题。从11g开始,如果一个用户使用不正确的密码尝试登录数据库,那么随着登录失败次数的增加,每次登录验证前延迟等待的时间也会增加:
sql> SET TIME ON 18:30:54 SQL> 18:30:58 SQL> conn test/test
Connected. 18:31:25 SQL> 18:31:25 SQL> conn test/a
conn test/a
conn test/a
conn test/a
conn test/a
conn test/a
conn test/a
conn test/test
conn test/a
ERROR:
ORA-01017: invalid username/passWord; loGon denied
Warning: You are no longer connected TO oracle. 18:31:26 SQL> ERROR:
ORA-01017: invalid username/password; logon denied 18:31:26 SQL> ERROR:
ORA-01017: invalid username/password; logon denied 18:31:26 SQL> ERROR:
ORA-01017: invalid username/password; logon denied 18:31:27 SQL> ERROR:
ORA-01017: invalid username/password; logon denied 18:31:29 SQL> ERROR:
ORA-01017: invalid username/password; logon denied 18:31:32 SQL> ERROR:
ORA-01017: invalid username/password; logon denied 18:31:36 SQL> Connected. 18:31:36 SQL> ERROR:
ORA-01017: invalid username/password; logon denied
Warning: You are no longer connected TO ORACLE. 18:31:36 SQL>
--结束END--
本文标题: 密码延迟验证导致的系统HANG住
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