学习-1
#su - oracle 切换用户
#sqlplus /nolog
#conn / as sysdba
create user usert1 identified by usert1;创建用户
grant connect,resource,dba to usert1;授权
create tablespace "usert1" datafile '/u01/oracle/usert1.dbf' size 1G autoextend on ; 创建表空间