--1、查看表空间的名称、大小、剩余空间
SELECT t.tablespace_name as 表空间名,
round(SUM(bytes / (1024 * 1024)), 0) as 大小_M
FROM dba_tablespaces t
inner join dba_data_files d
on t.tablespace_name = d.tablespace_name
GROUP BY t.tablespace_name;
--2、查看表空间物理文件的名称及大小
SELECT tablespace_name as 表空间名,
file_id,
file_name as 表空间文件名,
round(bytes / (1024 * 1024), 0) as 大小_M
FROM dba_data_files
ORDER BY tablespace_name;
--3、查看回滚段名称及大小
SELECT segment_name,
tablespace_name,
r.status,
(initial_extent / 1024) initialextent,
(next_extent / 1024) nextextent,
max_extents,
v.curext curextent
FROM dba_rollback_segs r, v$rollstat v
WHERE r.segment_id = v.usn(+)
ORDER BY segment_name;
--4、查看控制文件
SELECT NAME FROM v$controlfile;
--5、查看日志文件
SELECT MEMBER FROM v$logfile;
--6、查看表空间的使用情况
SELECT
tablespace_name as 表空间名,
,SUM(bytes) / (1024 * 1024) AS 剩余_M
FROM dba_free_space
GROUP BY tablespace_name;
SELECT a.tablespace_name,
a.bytes total,
b.bytes used,
c.bytes free,
(b.bytes * 100) / a.bytes "% USED ",
(c.bytes * 100) / a.bytes "% FREE "
FROM sys.sm$ts_avail a, sys.sm$ts_used b, sys.sm$ts_free c
WHERE a.tablespace_name = b.tablespace_name
AND a.tablespace_name = c.tablespace_name;
--7、查看数据库库对象
SELECT owner, object_type, status, COUNT(*) count#
FROM all_objects
GROUP BY owner, object_type, status;
--8、查看数据库的版本
SELECT version
FROM product_component_version
WHERE substr(product, 1, 6) = 'Oracle';
--9、查看数据库的创建日期和归档方式
SELECT created, log_mode, log_mode FROM v$database;
--1G=1024MB
--1M=1024KB
--1K=1024Bytes
--1M=11048576Bytes
--1G=1024*11048576Bytes=11313741824Bytes
SELECT a.tablespace_name "表空间名",
total "表空间大小",
free "表空间剩余大小",
(total - free) "表空间使用大小",
total / (1024 * 1024 * 1024) "表空间大小(G)",
free / (1024 * 1024 * 1024) "表空间剩余大小(G)",
(total - free) / (1024 * 1024 * 1024) "表空间使用大小(G)",
round((total - free) / total, 4) * 100 "使用率 %"
FROM (SELECT tablespace_name
, SUM(bytes) free
FROM dba_free_space
GROUP BY tablespace_name) a,
(SELECT tablespace_name, SUM(bytes) total
FROM dba_data_files
GROUP BY tablespace_name) b
WHERE a.tablespace_name = b.tablespace_name
转换临时表空间
查看当前的数据库默认临时表空间：
select * from database_properties
where property_name='DEFAULT_TEMP_TABLESPACE';
查看目前临时表空间的大小：
select file_name,tablespace_name
,bytes/1024/1024 as "MB"
,autoextensible
from dba_temp_files;
创建另一个临时表空间
create temporary tablespace TEMP2
TEMPFILE 'C:\APP\ADMINISTRATOR\ORADATA\ORCL\TEMP02.DBF'
SIZE 10M REUSE AUTOEXTEND ON NEXT 1M MAXSIZE UNLIMITED;
改变缺省临时表空间为刚刚创建的新临时表空间temp2
alter database default temporary tablespace temp2;
删除原来临时表空间
drop tablespace temp including contents and datafiles;
create temporary tablespace TEMP
TEMPFILE 'C:\APP\ADMINISTRATOR\ORADATA\ORCL\TEMP01.DBF'
SIZE 10G autoextend on next 1024m maxsize 30G;
alter tablespace temp add tempfile '/oracle/oradata/dbaxj/temp02.dbf' size 10240m autoextend on next 1024m maxsize 30G;
使用11g表空间收缩表空间，降低使用率，sql语句：
ALTER TABLESPACE TEMP SHRINK SPACE
1.查询所有临时表名字和空间大小
SELECT D.TABLESPACE_NAME,SPACE "SUM_SPACE(M)",BLOCKS SUM_BLOCKS,
USED_SPACE "USED_SPACE(M)",ROUND(NVL(USED_SPACE,0)/SPACE*100,2) "USED_RATE(%)",
NVL(FREE_SPACE,0) "FREE_SPACE(M)"
FROM
(SELECT TABLESPACE_NAME,ROUND(SUM(BYTES)/(1024*1024),2) SPACE,SUM(BLOCKS) BLOCKS
FROM DBA_TEMP_FILES
GROUP BY TABLESPACE_NAME) D,
(SELECT TABLESPACE_NAME,ROUND(SUM(BYTES_USED)/(1024*1024),2) USED_SPACE,
ROUND(SUM(BYTES_FREE)/(1024*1024),2) FREE_SPACE
FROM V$TEMP_SPACE_HEADER
GROUP BY TABLESPACE_NAME) F
WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME(+);
2.查询临时表名对应的使用情况
SELECT D.tablespace_name, SPACE "SUM_SPACE(M)", blocks "SUM_BLOCKS", used_space "USED_SPACE(M)", Round(Nvl(used_space, 0) / SPACE * 100, 2) "USED_RATE(%)",
SPACE - used_space "FREE_SPACE(M)" FROM (SELECT tablespace_name, Round(SUM(bytes) / (1024 * 1024), 2) SPACE, SUM(blocks) BLOCKS
FROM dba_temp_files GROUP BY tablespace_name) D, (SELECT tablespace, Round(SUM(blocks * 8192) / (1024 * 1024), 2) USED_SPACE
FROM v$sort_usage GROUP BY tablespace) F WHERE D.tablespace_name = F.tablespace(+)