一、Oracle查看 表空間 的名稱及其大小
查看 表空間的名稱及其大小的SQL語句：
select t1.tablespace_name,round(sum(bytes/(1024*1024)),0) tablespace_Size_MB from dba_tablespaces t1, dba_data_files t2 where t1.tablespace_name = t2.tablespace_name group by t1.tablespace_name;
查詢結果：
TABLESPACE_NAME TABLESPACE_SIZE_MB ------------------------------ ------------------ DLOTTEY 276480 SYSAUX 48450 UNDOTBS1 20000 INDEXMT 10240 USERS 1041 SYSTEM 10240 UNDOTBS2 20000 MMLOTTERY 215040 8 rows selected.
二、Oracle查看 表空間 的具體使用情況
方法1：（未排序）
select a.tablespace_name "tablespace_name",
totalspace "totalspaceM",
freespace "freespaceM",
round((1-freespace/totalspace)*100,2) "round%"
from
(select tablespace_name,round(sum(bytes)/1024/1024) totalspace from dba_data_files group by tablespace_name) a,
(select tablespace_name,round(sum(bytes)/1024/1024) freespace from dba_free_space group by tablespace_name) b
where a.tablespace_name=b.tablespace_name;
查詢結果：
tablespace_name totalspaceM freespaceM round% ------------------------ ----------- ---------- ---------- DLOTTEY 276480 232415 15.94 SYSAUX 48450 9683 80.01 UNDOTBS1 20000 19741 1.3 INDEXMT 10240 10024 2.11 USERS 1041 138 86.74 SYSTEM 10240 4344 57.58 UNDOTBS2 20000 19601 2 MMLOTTERY 215040 36279 83.13 8 rows selected.
方法二：（查詢結果排序）
select a.tablespace_name,
a.bytes/1024/1024 "Sum MB",
(a.bytes-b.bytes)/1024/1024 "used MB",
b.bytes/1024/1024 "free MB",
round(((a.bytes-b.bytes)/a.bytes)*100,2) "percent_used"
from
(select tablespace_name,sum(bytes) bytes from dba_data_files group by tablespace_name) a,
(select tablespace_name,sum(bytes) bytes,max(bytes) largest from dba_free_space group by tablespace_name) b
where a.tablespace_name=b.tablespace_name
order by ((a.bytes-b.bytes)/a.bytes) desc;
查詢結果：
TABLESPACE_NAME Sum MB used MB free MB percent_used ---------------------- ---------- ---------- ---------- ------------ USERS 1041.25 903.375 137.875 86.76 MMLOTTERY 215040 178761 36279 83.13 SYSAUX 48450 38767 9683 80.01 SYSTEM 10240 5896.125 4343.875 57.58 DLOTTEY 276480 44065.4375 232414.563 15.94 INDEXMT 10240 215.625 10024.375 2.11 UNDOTBS2 20000 399.3125 19600.6875 2 UNDOTBS1 20000 257.5 19742.5 1.29 8 rows selected.
三、Oracle查看 表空間物理文件 的名稱及大小
set lines 150;
col tablespace_name for a20;
col file_name for a60;
1、查詢所有的表空間
SQL語句：
select tablespace_name, file_id, file_name,
round(bytes/(1024*1024),0) total_space_MB
from dba_data_files
order by tablespace_name;
2、查詢指定的表空間
SQL語句：
select tablespace_name, file_id, file_name,
round(bytes/(1024*1024),0) total_space_MB
from dba_data_files
where tablespace_name = 'MMLOTTERY'
order by tablespace_name;
查詢結果：
TABLESPACE_NAME FILE_ID FILE_NAME TOTAL_SPACE_MB ------------------- ---------- ------------------------------------------- -------------- MMLOTTERY 18 +DATA/ora11g/datafile/mmlottery01.dbf 30720 MMLOTTERY 19 +DATA/ora11g/datafile/mmlottery02.dbf 30720 MMLOTTERY 20 +DATA/ora11g/datafile/mmlottery03.dbf 30720 MMLOTTERY 22 +DATA/ora11g/datafile/mmlottery04.dbf 30720 MMLOTTERY 23 +DATA/ora11g/datafile/mmlottery05.dbf 30720 MMLOTTERY 26 +DATA/ora11g/datafile/mmlottery06.dbf 30720 MMLOTTERY 27 +DATA/ora11g/datafile/mmlottery07.dbf 30720 7 rows selected.
四、Oracle查看 表 真實占用的空間
SQL語句：
select t.owner,t.segment_name,t.segment_type,
sum(t.bytes/1024/1024) used_MB
from dba_segments t
where owner = 'MMLOTTERY'
group by owner,segment_name,segment_type
order by used_MB desc;
查詢結果：
OWNER SEGMENT_NAME SEGMENT_TYPE USED_MB ------------------- -------------------------------- ------------------ ---------- MMLOTTERY TB_ORIGINAL_ORDERDETAILS TABLE 1792 MMLOTTERY TB_LOTTERY_SALEDETAIL TABLE 1472 MMLOTTERY TB_LOTTERYSCHEMEINFO_ADD TABLE 1280 MMLOTTERY TEST_007 TABLE 1152 MMLOTTERY TB_ACCOUNT_OPERATE_DETAIL TABLE 808 MMLOTTERY PK14 INDEX 377 MMLOTTERY PK14_11 INDEX 312 MMLOTTERY PK14_13 INDEX 200 MMLOTTERY PK14_12 INDEX 160 MMLOTTERY TB_BONUS_ORDERDETAILS TABLE 160 MMLOTTERY TB_WINBONUS_DETAIL TABLE 144 11 rows selected.
五、Oracle 增加表空間
語法：
alter tablespace {表空間名字} add datafile '物理數據文件路徑' SIZE 『初始大小M』 AUTOEXTEND ON NEXT 『自動擴展大小M』
例子：
alter tablespace MMLOTTERY add datafile '+DATA/ora11g/datafile/mmlottery08.dbf' size 30720m autoextend on next 200m;
注意：如果添加表空間的文件名重復，那么會報錯，如下：
SQL> alter tablespace MMLOTTERY add datafile '+DATA/ora11g/datafile/mmlottery08.dbf' size 30720m autoextend on next 200m; alter tablespace MMLOTTERY add datafile '+DATA/ora11g/datafile/mmlottery08.dbf' size 30720m autoextend on next 200m * ERROR at line 1: ORA-01537: cannot add file '+DATA/ora11g/datafile/mmlottery08.dbf' - file already part of database
若 datafile 加錯到表空間，則執行刪除操作。
alter tablespace MMLOTTERY
drop datafile '
+DATA/ora11g/datafile/mmlottery08.dbf
';
或者
alter database datafile '
+DATA/ora11g/datafile/mmlottery08.dbf
' offline drop;
六、Oracle 臨時表空間的查看與增加
查看臨時表空間
SQL語句：
select tablespace_name,file_id,file_name,round(bytes/1024/1024,0) temp_size_MB from dba_temp_files;
查詢結果：
TABLESPACE_NAME FILE_ID FILE_NAME TEMP_SIZE_MB ----------------- ---------- --------------------------------------------- ------------ TEMP 1 +DATA/ora11g/tempfile/temp.262.917714589 20000
增加臨時表空間文件
SQL語句：
alter tablespace TEMP add tempfile '+DATA/ora11g/tempfile/temp01.dbf' size 20000m autoextend on next 2000m;
七、查看表空間是否為自增
表空間是有數據文件組成的，所以看表空間是否自增即看數據文件，如下查自增的表空間：
select tablespace_name,file_name,autoextensible from dba_data_files where autoextensible='YES';
autoextensible: YES/NO 即表示是否自增。
示例：
SQL> select tablespace_name,file_name,autoextensible from dba_data_files where TABLESPACE_NAME='USERS'; TABLESPACE_NAME FILE_NAME AUT -------------------- ------------------------------------------------------------ --- USERS +DATA/ora11g/datafile/users.264.917714693 YES
【實例】Oracle 表空間的查看與增加
步驟 1、查看表空間的具體使用情況
SQL語句，如下：
select a.tablespace_name,
a.bytes/1024/1024 "Sum MB",
(a.bytes-b.bytes)/1024/1024 "used MB",
b.bytes/1024/1024 "free MB",
round(((a.bytes-b.bytes)/a.bytes)*100,2) "percent_used"
from
(select tablespace_name,sum(bytes) bytes from dba_data_files group by tablespace_name) a,
(select tablespace_name,sum(bytes) bytes,max(bytes) largest from dba_free_space group by tablespace_name) b
where a.tablespace_name=b.tablespace_name
order by ((a.bytes-b.bytes)/a.bytes) desc;
查詢結果：
TABLESPACE_NAME Sum MB used MB free MB percent_used
---------------------- ---------- ---------- ---------- ------------
USERS 1041.25 903.375 137.875 86.76
MMLOTTERY 215040 178761 36279 83.13
SYSAUX 48450 38767 9683 80.01
SYSTEM 10240 5896.125 4343.875 57.58
DLOTTEY 276480 44065.4375 232414.563 15.94
INDEXMT 10240 215.625 10024.375 2.11
UNDOTBS2 20000 399.3125 19600.6875 2
UNDOTBS1 20000 257.5 19742.5 1.29
8 rows selected.
步驟2、查看指定表空間（MMLOTTERY）的物理文件名稱及其大小
set lines 150;
col tablespace_name for a20;
col file_name for a60;
SQL語句：
select tablespace_name, file_id, file_name,
round(bytes/(1024*1024),0) total_space_MB
from dba_data_files
where tablespace_name = 'MMLOTTERY'
order by tablespace_name;
查詢結果：
TABLESPACE_NAME FILE_ID FILE_NAME TOTAL_SPACE_MB ------------------- ---------- ------------------------------------------- -------------- MMLOTTERY 18 +DATA/ora11g/datafile/mmlottery01.dbf 30720 MMLOTTERY 19 +DATA/ora11g/datafile/mmlottery02.dbf 30720 MMLOTTERY 20 +DATA/ora11g/datafile/mmlottery03.dbf 30720 MMLOTTERY 22 +DATA/ora11g/datafile/mmlottery04.dbf 30720 MMLOTTERY 23 +DATA/ora11g/datafile/mmlottery05.dbf 30720 MMLOTTERY 26 +DATA/ora11g/datafile/mmlottery06.dbf 30720 MMLOTTERY 27 +DATA/ora11g/datafile/mmlottery07.dbf 30720 7 rows selected.
步驟3、增加指定表空間（MMLOTTERY）的大小
增加指定表空間的大小，SQL語句：
SQL> alter tablespace MMLOTTERY add datafile '+DATA/ora11g/datafile/mmlottery.dbf' size 30720m;
Tablespace altered.
根據步驟2的命令，查詢增加后的結果：
TABLESPACE_NAME FILE_ID FILE_NAME TOTAL_SPACE_MB
-------------------- ---------- ------------------------------------------------------------ --------------
MMLOTTERY 18 +DATA/ora11g/datafile/mmlottery01.dbf 30720
MMLOTTERY 19 +DATA/ora11g/datafile/mmlottery02.dbf 30720
MMLOTTERY 20 +DATA/ora11g/datafile/mmlottery03.dbf 30720
MMLOTTERY 22 +DATA/ora11g/datafile/mmlottery04.dbf 30720
MMLOTTERY 23 +DATA/ora11g/datafile/mmlottery05.dbf 30720
MMLOTTERY 26 +DATA/ora11g/datafile/mmlottery06.dbf 30720
MMLOTTERY 27 +DATA/ora11g/datafile/mmlottery07.dbf 30720
MMLOTTERY 28 +DATA/ora11g/datafile/mmlottery08.dbf 30720
8 rows selected.
步驟4、查看增加表空間后的具體情況
SQL語句：
select a.tablespace_name,
a.bytes/1024/1024 "Sum MB",
(a.bytes-b.bytes)/1024/1024 "used MB",
b.bytes/1024/1024 "free MB",
round(((a.bytes-b.bytes)/a.bytes)*100,2) "percent_used"
from
(select tablespace_name,sum(bytes) bytes from dba_data_files group by tablespace_name) a,
(select tablespace_name,sum(bytes) bytes,max(bytes) largest from dba_free_space group by tablespace_name) b
where a.tablespace_name=b.tablespace_name
and a.tablespace_name='MMLOTTERY';
查詢結果：
TABLESPACE_NAME Sum MB used MB free MB percent_used -------------------- ---------- ---------- ---------- ------------ MMLOTTERY 245760 179218 66542 72.92
【備注】
Oracle只查詢一條記錄的語句：
select * from tablename where rownum = 1;
修改用戶默認表空間
alter user user_name default tablespace dev_tb; alter user user_name temporary tablespace dev_temp;
查看數據文件是否有數據：
只需查看數據文件中是否包含extent段。如果有extent（索引段，數據段）段，則說明數據文件中有數據。
使用dba_extents視圖和dba_data_files視圖進行連接查詢。
select t.file_name,t1.owner,t1.segment_name,t1.segment_type,t1.tablespace_name from dba_data_files t,dba_extents t1 where t.file_id=t1.file_id and file_name='你要查詢的數據文件路徑';