?????SQL*PLUS
1.oracle????
sqlplus user/password
2.oracle????(????)
sqlplus user/password@orcl
@???tnsnames.ora??????????????????
3.oracle????(???????OS??)
sqlplus "/ as sysdba"
/?OS???@??????????????
4.oracle????(???????????)
sqlplus "sys/password@orcl as sysdba"
5.????????
sqlplus "/nolog"
connect ?????????
?????????????????????????