1. 在创建pwd文件时，不能在结尾加分号否则会出现如下错误
[oracle@localhost pfile]$ orapwd file=$ORACLE_HOME/dbs/orapwtest.ora password=jume123456 entries =30;
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.
