Oracle 查看表空间的大小及使用情况sql语句

Oracle 查看表空间的大小及使用情况sql语句

1、查看表空间的名称及大小

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、查看表空间物理文件的名称及大小

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 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.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

10、赋予创建dblink的权限有三种：

grant create database link to user ; --只有user用户能使用的dblink
grant create public database link to user ;--所有用户都可以使用的dblink
grant drop public database link to user; --删除dblink的权限，看你创建语句是public dblink，所以要[DBA](https://www.baidu.com/s?wd=DBA&tn=SE_PcZhidaonwhc_ngpagmjz&rsv_dl=gh_pc_zhidao)用户付给user第二种权限才行