今天需要在测试环境中做一些性能测试，为了不影响原有的数据，准备创建一个临时的schema。但是创建的时候报了如下的错误。
SQL> create user mig_perf identified by mig_perf;
create user mig_perf identified by mig_perf
*
ERROR at line 1:
ORA-28003: password verification for the specified password failed
ORA-20002: Password same as or similar to user
第一感觉就是开启了密码的校验，11g里面有一个新特性的关于密码的大小写敏感的，会不会有关联呢。似乎有些牵强，但是目前是false选项，表示不对大小写敏感。
SQL> show parameter sen
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
sec_case_sensitive_logon boolean FALSE
如果还有问题，就需要从profie的角度入手了，比如登录密码超过10次，账户就会锁定，这些都是在profile里面配置的。
来看看能得到什么信息。
select *from dba_profiles order by profile;
SQL> /
PROFILE RESOURCE_NAME RESOURCE LIMIT
------------------------------ -------------------------------- -------- ----------------------------------------
DBAMON_PF1 COMPOSITE_LIMIT KERNEL UNLIMITED
DBAMON_PF1 SESSIONS_PER_USER KERNEL 10
DBAMON_PF1 CPU_PER_SESSION KERNEL UNLIMITED
DBAMON_PF1 CPU_PER_CALL KERNEL UNLIMITED
DBAMON_PF1 LOGICAL_READS_PER_SESSION KERNEL UNLIMITED
DBAMON_PF1 LOGICAL_READS_PER_CALL KERNEL UNLIMITED
DBAMON_PF1 IDLE_TIME KERNEL UNLIMITED
DBAMON_PF1 CONNECT_TIME KERNEL UNLIMITED
DBAMON_PF1 PRIVATE_SGA KERNEL DEFAULT
DBAMON_PF1 FAILED_LOGIN_ATTEMPTS PASSWORD 10
DBAMON_PF1 PASSWORD_LIFE_TIME PASSWORD UNLIMITED
DBAMON_PF1 PASSWORD_REUSE_TIME PASSWORD UNLIMITED
DBAMON_PF1 PASSWORD_REUSE_MAX PASSWORD UNLIMITED
DBAMON_PF1 PASSWORD_VERIFY_FUNCTION PASSWORD VERIFY_FUNCTION
DBAMON_PF1 PASSWORD_LOCK_TIME PASSWORD .0106
DBAMON_PF1 PASSWORD_GRACE_TIME PASSWORD UNLIMITED
DEFAULT COMPOSITE_LIMIT KERNEL UNLIMITED
DEFAULT SESSIONS_PER_USER KERNEL UNLIMITED
DEFAULT CPU_PER_SESSION KERNEL UNLIMITED
DEFAULT CPU_PER_CALL KERNEL UNLIMITED
DEFAULT LOGICAL_READS_PER_SESSION KERNEL UNLIMITED
DEFAULT LOGICAL_READS_PER_CALL KERNEL UNLIMITED
DEFAULT IDLE_TIME KERNEL UNLIMITED
DEFAULT CONNECT_TIME KERNEL UNLIMITED
DEFAULT PRIVATE_SGA KERNEL UNLIMITED
DEFAULT FAILED_LOGIN_ATTEMPTS PASSWORD 10
DEFAULT PASSWORD_LIFE_TIME PASSWORD 180
DEFAULT PASSWORD_REUSE_TIME PASSWORD UNLIMITED
DEFAULT PASSWORD_REUSE_MAX PASSWORD UNLIMITED
DEFAULT PASSWORD_VERIFY_FUNCTION PASSWORD VERIFY_FUNCTION_11G
DEFAULT PASSWORD_LOCK_TIME PASSWORD 1
DEFAULT PASSWORD_GRACE_TIME PASSWORD 7
我创建的新用户，没有指定profile，所以会是默认的default profile，对应的"PASSWORD_VERIFY_FUNCTION" 有一些差别。
看来是对于密码安全的加强，来看看相关的简单测试，看看密码验证还都做了那些校验。
SQL> create user mig_perf identified by mig_perf1;
create user mig_perf identified by mig_perf1
*
ERROR at line 1:
ORA-28003: password verification for the specified password failed
ORA-20005: Password same as or similar to user name
SQL> create user mig_perf identified by abc;
create user mig_perf identified by abc
*
ERROR at line 1:
ORA-28003: password verification for the specified password failed
ORA-20001: Password length less than 8
SQL> create user mig_perf identified by abcabc12;
User created.
SQL> drop user mig_perf;
User dropped.
当然了“PASSWORD VERIFY_FUNCTION_11G”其实是一个function来实现的。具体的细节可以在$Oracle_HOME/rdbms/admin/utlpwdmg.sql中查看。
> ls -lrt utlpwd*
-rw-r--r-- 1 oraccbs1 dba 11555 Aug 13 2006 utlpwdmg.sql
-- This script sets the default password resource parameters
-- This script needs to be run to enable the password features.
-- However the default resource parameters can be changed based
-- on the need.
-- A default password complexity function is also provided.
-- This function makes the minimum complexity checks like
-- the minimum length of the password, password not same as the
-- username, etc. The user may enhance this function according to
-- the need.
-- This function must be created in SYS schema.
-- connect sys/<password> as sysdba before running the script