oracle01537,ORACLE REUSE实验

一、查看数据文件位置

SQL> show user;

User is "SYS"

SQL> desc dba_data_files;

Name Type Nullable Default Comments

--------------- ------------- -------- ------- ---------------------------------------------------

FILE_NAME VARCHAR2(513) Y Name of the database data file

FILE_ID NUMBER Y ID of the database data file

TABLESPACE_NAME VARCHAR2(30) Y Name of the tablespace to which the file belongs

BYTES NUMBER Y Size of the file in bytes

BLOCKS NUMBER Y Size of the file in ORACLE blocks

STATUS VARCHAR2(9) Y File status: "INVALID" or "AVAILABLE"

RELATIVE_FNO NUMBER Y Tablespace-relative file number

AUTOEXTENSIBLE VARCHAR2(3) Y Autoextensible indicator: "YES" or "NO"

MAXBYTES NUMBER Y Maximum size of the file in bytes

MAXBLOCKS NUMBER Y Maximum size of the file in ORACLE blocks

INCREMENT_BY NUMBER Y Default increment for autoextension

USER_BYTES NUMBER Y Size of the useful portion of file in bytes

USER_BLOCKS NUMBER Y Size of the useful portion of file in ORACLE blocks

ONLINE_STATUS VARCHAR2(7) Y Online status of the file

SQL> select file_name from dba_data_files;

FILE_NAME

--------------------------------------------------------------------------------

/u01/app/oracle/oradata/orcl/users01.dbf

/u01/app/oracle/oradata/orcl/undotbs01.dbf

/u01/app/oracle/oradata/orcl/sysaux01.dbf

/u01/app/oracle/oradata/orcl/system01.dbf

/u01/app/oracle/oradata/orcl/example01.dbf

/u01/app/oracle/oradata/orcl/jerry.db

/u01/app/oracle/oradata/orcl/bftbs01.dbf

/u01/app/oracle/oradata/orcl/rman01.dbf

/u01/app/oracle/oradata/orcl/eygle01.dbf

/u01/app/oracle/oradata/orcl/fbra01.dbf

/u01/app/oracle/oradata/orcl/demo01.dbf

/u01/app/oracle/oradata/orcl/undotbs02.dbf

12 rows selected

二、创建测试表空间

SQL> create tablespace testreuse datafile '/u01/app/oracle/oradata/orcl/testreuse01.dbf' size 100m;

Tablespace created

三、创建测试表

SQL> create table testreuse tablespace testreuse as select * from dba_objects;

Table created

SQL> select count(*) from testreuse;

COUNT(*)

----------

72890

四、查看表所在空间

SQL> select owner,table_name,tablespace_name from dba_tables where table_name='TESTREUSE';

OWNER TABLE_NAME TABLESPACE_NAME

------------------------------ ------------------------------ ------------------------------

SYS TESTREUSE TESTREUSE

五、指定REUSE，需要指定文件大小，否则报错。

SQL> alter tablespace testreuse add datafile '/u01/app/oracle/oradata/orcl/testreuse02.dbf' reuse;

alter tablespace testreuse add datafile '/u01/app/oracle/oradata/orcl/testreuse02.dbf' reuse

ORA-01119: error in creating database file '/u01/app/oracle/oradata/orcl/testreuse02.dbf'

ORA-17610: file '/u01/app/oracle/oradata/orcl/testreuse02.dbf' does not exist and no size specified

ORA-27037: unable to obtain file status

Linux Error: 2: No such file or directory

Additional information: 3

SQL> alter tablespace testreuse add datafile '/u01/app/oracle/oradata/orcl/testreuse02.dbf' size 200m reuse;

Tablespace altered

六、文件不能已经存在于此表空间，否则报错。

SQL> alter tablespace testreuse add datafile '/u01/app/oracle/oradata/orcl/testreuse01.dbf' size 200m reuse;

alter tablespace testreuse add datafile '/u01/app/oracle/oradata/orcl/testreuse01.dbf' size 200m reuse

ORA-01537: cannot add file '/u01/app/oracle/oradata/orcl/testreuse01.dbf' - file already part of database

七、使用ALTER DATABASE DATAFILE OFFLINE DROP(不会实际删除，相关信息还会记录在数据字典中，仅标记为offline，需要RECOVER)

SQL> select t.file_name,t.file_id,t.tablespace_name,t.status,t.online_status from DBA_DATA_FILES t;

FILE_NAME FILE_ID TABLESPACE_NAME STATUS ONLINE_STATUS

-------------------------------------------------------------------------------- ---------- ------------------------------ --------- -------------

/u01/app/oracle/oradata/orcl/users01.dbf 4 USERS AVAILABLE ONLINE

/u01/app/oracle/oradata/orcl/undotbs01.dbf 3 UNDOTBS1 AVAILABLE ONLINE

/u01/app/oracle/oradata/orcl/sysaux01.dbf 2 SYSAUX AVAILABLE ONLINE

/u01/app/oracle/oradata/orcl/system01.dbf 1 SYSTEM AVAILABLE SYSTEM

/u01/app/oracle/oradata/orcl/example01.dbf 5 EXAMPLE AVAILABLE ONLINE

/u01/app/oracle/oradata/orcl/jerry.db 6 JERRY AVAILABLE ONLINE

/u01/app/oracle/oradata/orcl/bftbs01.dbf 7 BFTBS AVAILABLE ONLINE

/u01/app/oracle/oradata/orcl/rman01.dbf 8 RMAN AVAILABLE ONLINE

/u01/app/oracle/oradata/orcl/eygle01.dbf 9 EYGLE AVAILABLE ONLINE

/u01/app/oracle/oradata/orcl/fbra01.dbf 10 FBRA AVAILABLE ONLINE

/u01/app/oracle/oradata/orcl/demo01.dbf 11 DEMO AVAILABLE ONLINE

/u01/app/oracle/oradata/orcl/undotbs02.dbf 14 UNDOTBS2 AVAILABLE ONLINE

/u01/app/oracle/oradata/orcl/testreuse01.dbf 12 TESTREUSE AVAILABLE ONLINE

/u01/app/oracle/oradata/orcl/testreuse02.dbf 13 TESTREUSE AVAILABLE ONLINE

14 rows selected

SQL> alter database datafile '/u01/app/oracle/oradata/orcl/testreuse01.dbf' offline drop;

Database altered