Oracle查看錶空間大小及其使用情況
注意存在表空間不存在於dba_free_space 中(可能是因爲表空間過大已爆掉)
1、查看錶空間的名稱及大小
SELECT t.tablespace_name, round(SUM(bytes / (1024 * 1024)), 0) ts_size
FROM dba_tablespaces t, dba_data_files d
WHERE t.tablespace_name = d.tablespace_name
GROUP BY t.tablespace_name;
2、查看錶空間物理文件的名稱及大小
SELECT tablespace_name,
file_id,
file_name,
round(bytes / (1024 * 1024), 0) total_space
FROM dba_data_files
ORDER BY tablespace_name;
3、查看回滾段名稱及大小
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、查看日誌文件
SELECT MEMBER FROM v$logfile;
6、查看錶空間的使用情況
SELECT SUM(bytes) / (1024 * 1024) AS free_space, tablespace_name
FROM dba_free_space
GROUP BY tablespace_name;
SELECT a.tablespace_name,
a.bytes total,
b.bytes used,
c.bytes free,
(b.bytes * 100) / a.bytes "% USED ",
(c.bytes * 100) / a.bytes "% FREE "
FROM sys.smts_used b, sys.sm$ts_free c
WHERE a.tablespace_name = b.tablespace_name
AND a.tablespace_name = c.tablespace_name;
7、查看數據庫庫對象
SELECT owner, object_type, status, COUNT(*) count#
FROM all_objects
GROUP BY owner, object_type, status;
8、查看數據庫的版本
SELECT version
FROM product_component_version
WHERE substr(product, 1, 6) = ‘Oracle’;
9、查看數據庫的創建日期和歸檔方式
SELECT created, log_mode, log_mode FROM v$database;
- 1G=1024MB
- 1M=1024KB
- 1K=1024Bytes
- 1M=11048576Bytes
- 1G=1024*11048576Bytes=11313741824Bytes
SELECT a.tablespace_name “表空間名”,
total “表空間大小”,
free “表空間剩餘大小”,
(total - free) “表空間使用大小”,
total / (1024 * 1024 * 1024) “表空間大小(G)”,
free / (1024 * 1024 * 1024) “表空間剩餘大小(G)”,
(total - free) / (1024 * 1024 * 1024) “表空間使用大小(G)”,
round((total - free) / total, 4) * 100 “使用率 %”
FROM (SELECT tablespace_name, SUM(bytes) free
FROM dba_free_space
GROUP BY tablespace_name) a,
(SELECT tablespace_name, SUM(bytes) total
FROM dba_data_files
GROUP BY tablespace_name) b
WHERE a.tablespace_name = b.tablespace_name;
10、更改數據表大小(10G)
alter database datafile ‘/ora/oradata/radius/undo.dbf’ resize 10240m;
11、設置表空間不足時自動增長
查看錶空間是否自動增長
SELECT FILE_NAME,TABLESPACE_NAME,AUTOEXTENSIBLE FROM dba_data_files;
設置表空間自動增長
//打開自動增長
ALTER DATABASE DATAFILE ‘c:\SmartDB01.ora’ AUTOEXTEND ON;
//每次自動增長200m
ALTER DATABASE DATAFILE ‘c:\SmartDB01.ora’ AUTOEXTEND ON NEXT 200M ;
//每次自動增長200m,數據表最大不超過1G
ALTER DATABASE DATAFILE ‘c:\SmartDB01.ora’ AUTOEXTEND ON NEXT 200M MAXSIZE 1024M;
12、查詢 temp 表空間和使用情況時需要單獨的腳本
數據庫會存在 temp 表空間
select d.tablespace_name,
space “sum_space(m)”,
blocks sum_blocks,
used_space “used_space(m)”,
round(nvl(used_space, 0) / space * 100, 2) “used_rate(%)”,
nvl(free_space, 0) “free_space(m)”
from (select tablespace_name,
round(sum(bytes) / (1024 * 1024), 2) space,
sum(blocks) blocks
from dba_temp_files
group by tablespace_name) d,
(select tablespace_name,
round(sum(bytes_used) / (1024 * 1024), 2) used_space,
round(sum(bytes_free) / (1024 * 1024), 2) free_space
from v$temp_space_header
group by tablespace_name) f
where d.tablespace_name = f.tablespace_name(+);
返回結果:
TABLESPACE_NAME sum_space(m) SUM_BLOCKS used_space(m) used_rate(%) free_space(m)
TEMP 663 84864 663 100 0
但這種情況並不能表示目前臨時表空間的使用情況,比如某臨時表空間已經使用了100%,該操作完畢後,臨時表空間的HWM標誌沒有被回收,所以如果想知道當前的臨時表空間使用,需要通過vsort_usage;
臨時表空間,請查詢DBA_TEMP_FREE_SPACE
SELECT TABLESPACE_NAME, FREE_SPACE/1024/1024 AS “FREE SPACE(M)”
FROM DBA_TEMP_FREE_SPACE
WHERE TABLESPACE_NAME = ‘&tablespace_name’;
臨時表空間,請查詢DBA_TEMP_FILES
SELECT TABLESPACE_NAME, FILE_ID, FILE_NAME, BYTES/1024/1024 AS “SPACE(M)”
FROM DBA_TEMP_FILES
WHERE TABLESPACE_NAME = ‘&tablespace_name’;
爲空間不足的表空間增加數據文件
ALTER TABLESPACE &tablespace_name ADD DATAFILE ‘&datafile_name’ SIZE 2G;
注:如果要爲臨時表空間擴容,使用下面的語句
ALTER TABLESPACE &tablespace_name ADD TEMPFILE ‘&datafile_name’ SIZE 2G;
也可以修改數據文件的大小