SQL> select status from v$instance;

SQL> create user user1 identified by redhat;
SQL> conn user1/redhat
ERROR:
ORA-01045: user USER1 lacks CREATE SESSION privilege; logon denied
Warning: You are no longer connected to ORACLE.
SQL> show user
USER is ""
SQL> conn / as sysdba
Connected.
SQL> grant connect to user1;
SQL> conn user1/redhat;
Connected.

SQL> drop user user1 ;

SQL> select * from all_users;

SQL> @PATH/filename.sql

SQL>set timing on ;

SQL> select name from v$database;

[grid@rac01 ~]$ lsnrctl status
[grid@rac01 ~]$ lsnrctl stop
[grid@rac01 ~]$ lsnrctl start

SQL> shutdown immediate;

SQL> startup

select * from user_role_privs;

select * from dba_data_files;

SQL> select name,log_mode from v$database;
SQL> archive log list;
SQL> select archiver from v$instance;

SQL> alter database archivelog;
alter database archivelog
*
ERROR at line 1:
ORA-01126: database must be mounted in this instance and not open in any
instanceSQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL>
SQL> startup mount
ORACLE instance started.Total System Global Area  784998400 bytes
Fixed Size          2257352 bytes
Variable Size         541068856 bytes
Database Buffers      239075328 bytes
Redo Buffers            2596864 bytes
Database mounted.
SQL>
SQL> alter database archivelog;Database altered.SQL> alter database open;Database altered.SQL> alter system archive log start;System altered.

SQL> alter database noarchivelog;

select * from v$tablespace;

SQL> select tablespace_name,sum(bytes)/1024/1024 from dba_data_files group by tablespace_name; -- 单位是M

SQL> select username,default_tablespace from dba_users;

SQL> create tablespace test_tbsp datafile '/home/oracle/oradata/test_tbsp.dbf' size 100M;

SQL> alter user user1 default tablespace test_tbsp;

SQL> select file_name,autoextensible,increment_by from dba_data_files where tablespace_name='TEST_TBSP';

SQL> alter database datafile '/home/oracle/oradata/test_tbsp.dbf' autoextend on;

SQL> alter database datafile '/home/oracle/oradata/test_tbsp.dbf' autoextend off;