oracle11g的密码文件是在目录 /u01/app/oracle/product/11.2.0/dbhome_1/dbs下面
新建密码文件的命令
orapwd file=orapwcapaas（orapw+数据库SID） password=Oracle123（SYS用户的密码） entries=10 （最大尝试次数）
orapwd file=orapwwubin01 password=oracle123 entries=10 (这个是对的)
orapwd file =orapwwubin01 password=oracle123 entries=10 （这个会报错，因为file =orapwdsid=号之前有空格）
报错详细信息：
Usage: orapwd file=<fname> entries=<users> force=<y/n> ignorecase=<y/n> nosysdba=<y/n>
where
file – name of password file (required),
password – password for SYS will be prompted if not specified at command line,
entries – maximum number of distinct DBA (optional),
force – whether to overwrite existing file (optional),
ignorecase – passwords are case-insensitive (optional),
nosysdba – whether to shut out the SYSDBA logon (optional Database Vault only).
There must be no spaces around the equal-to (=) character.
在遇到报错 ORA-01031 insufficient privileges的时候可以尝试重建密码文件
