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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>
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