转自：http://blog.csdn.net/pan_tian/article/details/7708430
Apps schema:本身不拥有任何表，对于每一个独立Schema下的表数据，在Apps schema下要同样有一个synonym存在。apps的默认密码为“apps”.
关于Apps Schema可以参见：http://blog.csdn.net/cymm_liu/article/details/10164877
Applsys Schema:包含所有系统管理(administarative)相关的表，比如Workflow，AD，FND...，默认密码和apps一样，也为“apps”
The APPLSYS schema owns the AD and FND objects (a better name for APPLSYS would or could be FND, you will not find FND as a schema name in EBS, even though you will find the FND_TOP and FND tables...). In other words, you could compare the APPLSYS schema to any other product schema like GL, PER or similar.
Refer:https://forums.oracle.com/forums/thread.jspa?threadID=651979
APPLSYS和APPS的密码必须同时修改，保持一致。必须先修改APPLSYS，再修改APPS。为了防止不恰当的修改造成用户无法登陆系统，在更改前请备份FND_ORACLE_ID和FND_USER表。
Note:160337.1：How To Manually Change The APPS, APPLSYS and APPLSYSPUB Passwords in Oracle Applications
Note:159244.1：How To Use FNDCPASS to Change The Oracle Users, APPS, APPLSYS and Application Module Passwords (INV, AR, AP, etc.) For Applications 11.5 in Unix
