Oracle数据库管理 DBA必会知识点

grant select any dictionary to scott;create table t1 as select * from emp;insert into t1 select * from t1;--查用户看scot

grant select any dictionary to scott;
create table t1 as select * from emp;
insert into t1 select * from t1;
--查用户看scott用户下的段名为T1的存储分区记录
select segment_name,extent_id,file_id,block_id,blocks
from dba_extents where owner='SCOTT' and segment_name='T1';
--给段T1分配大小为100k的存储区间
alter table t1 allocate
extent(datafile '/u01/app/Oracle/oradata/orcl/users01.dbf' size 100k);
--回收高水位线之后的空闲空间
alter table t1 deallocate unused;
--回收高水位线20k之后的空闲空间
alter table a deallocate unused keep 20k;
SQL> truncate table T1;
截断表之后，，段的第一个分区依然存在，但是数据都已经清空

 

oracle重命名数据文件的名字
SQL> alter tablespace aaa offline;
Tablespace altered.
SQL> select ts#,name from v$tablespace;
      TS# NAME
---------- ------------------------------
        0 SYSTEM
        1 SYSAUX
        2 UNDOTBS1
        4 USERS
        3 TEMP
        6 EXAMPLE
        7 YUANLEI
        8 AAA
SQL> select ts#,file#,name,status from v$datafile;
      TS#      FILE# NAME                                          STATUS
---------- ---------- --------------------------------------------- -------
        0          1 /u01/app/oracle/oradata/orcl/system01.dbf    SYSTEM
        1          2 /u01/app/oracle/oradata/orcl/sysaux01.dbf    ONLINE
        2          3 /u01/app/oracle/oradata/orcl/undotbs01.dbf    ONLINE
        4          4 /u01/app/oracle/oradata/orcl/users01.dbf      ONLINE
        6          5 /u01/app/oracle/oradata/orcl/example01.dbf    ONLINE
        8          6 /u01/app/oracle/oradata/orcl/bbb01.dbf        OFFLINE
SQL> host rename /u01/app/oracle/oradata/orcl/bbb01.dbf aaa01.dbf;
[oracle@oracle11gR2 orcl]$ pwd
/u01/app/oracle/oradata/orcl

[oracle@oracle11gR2 orcl]$ cp bbb01.dbf aaa01.dbf
[oracle@oracle11gR2 orcl]$ ls
aaa01.dbf      example01.dbf  redo03.log    temp01.dbf    yuanlei01.dbf
bbb01.dbf      redo01.log    sysaux01.dbf  undotbs01.dbf
control01.ctl  redo02.log    system01.dbf  users01.dbf

SQL> alter database rename file '/u01/app/oracle/oradata/orcl/bbb01.dbf' to '/u01/app/oracle/oradata/orcl/aaa01.dbf';
Database altered.

SQL> alter tablespace aaa online;
Tablespace altered.

SQL> select ts#,file#,name,status from v$datafile;
      TS#      FILE# NAME                                          STATUS
---------- ---------- --------------------------------------------- -------
        0          1 /u01/app/oracle/oradata/orcl/system01.dbf    SYSTEM
        1          2 /u01/app/oracle/oradata/orcl/sysaux01.dbf    ONLINE
        2          3 /u01/app/oracle/oradata/orcl/undotbs01.dbf    ONLINE
        4          4 /u01/app/oracle/oradata/orcl/users01.dbf      ONLINE
        6          5 /u01/app/oracle/oradata/orcl/example01.dbf    ONLINE
        8          6 /u01/app/oracle/oradata/orcl/aaa01.dbf        ONLINE
6 rows selected.
重命名成功

-----创建临时表空间
SQL> create temporary tablespace test_temp
tempfile  '/u01/app/oracle/oradata/orcl/test_temp.dbf' size 10M
autoextend on next 10M maxsize 100M extent management local;

------创建用户表空间并制定用户表空间
SQL> create temporary tablespace test_temp tempfile '/u01/app/oracle/oradata/orcl/test_temp.dbf' size 10M autoextend on next 10M maxsize 100M extent management local;
Tablespace created.
SQL> create tablespace test_data logging datafile '/u01/app/oracle/oradata/orcl/test_data.dbf'
 2  size 10M autoextend on next 20M maxsize 100M extent management local;
Tablespace created.
SQL> create user yuanlei identified by leiyuan default tablespace test_data temporary tablespace test_temp;
User created.

------查看所有用户
SELECT * FROM DBA_USERS;

-----查看用户所在的默认和临时表空间，后面可跟where 条件
SQL> select username,default_tablespace,temporary_tablespace from dba_users;

-----修改用户的默认和临时表空间
SQL> alter user yuanlei default tablespace users;
User altered.
SQL> alter user yuanlei temporary tablespace temp;
User altered.