Mysql版
1、查看所有数据库容量大小
-- 查看所有数据库容量大小
SELECT
table_schema AS '数据库',
sum( table_rows ) AS '记录数',
sum(
TRUNCATE ( data_length / 1024 / 1024, 2 )) AS '数据容量(MB)',
sum(
TRUNCATE ( index_length / 1024 / 1024, 2 )) AS '索引容量(MB)'
FROM
information_schema.TABLES
GROUP BY
table_schema
ORDER BY
sum( data_length ) DESC,
sum( index_length ) DESC;
2、查看所有数据库各表容量大小
SELECT
table_schema AS '数据库',
table_name AS '表名',
table_rows AS '记录数',
TRUNCATE ( data_length / 1024 / 1024, 2 ) AS '数据容量(MB)',
TRUNCATE ( index_length / 1024 / 1024, 2 ) AS '索引容量(MB)'
FROM
information_schema.TABLES
ORDER BY
data_length DESC,
index_length DESC;
3、查看指定数据库容量大小
SELECT
table_schema AS '数据库',
sum( table_rows ) AS '记录数',
sum(
TRUNCATE ( data_length / 1024 / 1024, 2 )) AS '数据容量(MB)',
sum(
TRUNCATE ( index_length / 1024 / 1024, 2 )) AS '索引容量(MB)'
FROM
information_schema.TABLES
WHERE
table_schema = '数据库名';
4.查看指定数据库各表容量大小
SELECT
table_schema AS '数据库',
table_name AS '表名',
table_rows AS '记录数',
TRUNCATE ( data_length / 1024 / 1024, 2 ) AS '数据容量(MB)',
TRUNCATE ( index_length / 1024 / 1024, 2 ) AS '索引容量(MB)'
FROM
information_schema.TABLES
WHERE
table_schema = '数据库名'
ORDER BY
data_length DESC,
index_length DESC;
5.查看指定数据库各表信息
SHOW TABLE STATUS;
oracle版
1、查看表所占的空间大小
-- 不需要DBA权限
SELECT SEGMENT_NAME TABLENAME,(BYTES/1024/1024) MB
,RANK() OVER (PARTITION BY NULL ORDER BY BYTES DESC) RANK_ID //根据表大小进行排序
FROM USER_SEGMENTS
WHERE SEGMENT_TYPE='TABLE'
-- 需要DBA权限,一般情况下很少会给这么高的权限,可以说这个权限基本没有,所以一般工作中不是DBA的人不会常用到这个命令
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、查看表空间的使用情况
SELECT a.tablespace_name "表空间名称",
total / (1024 * 1024) "表空间大小(M)",
free / (1024 * 1024) "表空间剩余大小(M)",
(total - free) / (1024 * 1024 ) "表空间使用大小(M)",
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
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$logfile;
6、查看数据库对象
SELECT owner, object_type, status, COUNT(*) count#
FROM all_objects
GROUP BY owner, object_type, status;
7、查看数据库版本
SELECT version
FROM product_component_version
WHERE substr(product, 1, 6) = 'Oracle';
8、查看数据库的创建日期和归档方式
SELECT created, log_mode, log_mode FROM v$database;
9、查看表空间是否具有自动扩展的能力
SELECT T.TABLESPACE_NAME,D.FILE_NAME,
D.AUTOEXTENSIBLE,D.BYTES,D.MAXBYTES,D.STATUS
FROM DBA_TABLESPACES T,DBA_DATA_FILES D
WHERE T.TABLESPACE_NAME =D.TABLESPACE_NAME
ORDER BY TABLESPACE_NAME,FILE_NAME;
oracle加强版
一、查看表空间使用率
1.查看数据库表空间文件:
--查看数据库表空间文件
select * from dba_data_files;
2.查看所有表空间的总容量：
--查看所有表空间的总容量
select dba.TABLESPACE_NAME, sum(bytes)/1024/1024 as MB
from dba_data_files dba
group by dba.TABLESPACE_NAME;
3.查看数据库表空间使用率
--查看数据库表空间使用率
select total.tablespace_name,round(total.MB, 2) as Total_MB,round(total.MB - free.MB, 2) as Used_MB,round((1-free.MB / total.MB)* 100, 2) || '%' as Used_Pct
from (
select tablespace_name, sum(bytes) /1024/1024 as MB
from dba_free_space group by tablespace_name) free,
(select tablespace_name, sum(bytes) / 1024 / 1024 as MB
from dba_data_files group by tablespace_name) total
where free.tablespace_name = total.tablespace_name
order by used_pct desc;
4.1.查看表空间总大小、使用率、剩余空间
--查看表空间总大小、使用率、剩余空间
select a.tablespace_name, total, free, total-free as used, substr(free/total * 100, 1, 5) as "FREE%", substr((total - free)/total * 100, 1, 5) as "USED%"
from
(select tablespace_name, sum(bytes)/1024/1024 as total from dba_data_files group by tablespace_name) a,
(select tablespace_name, sum(bytes)/1024/1024 as free from dba_free_space group by tablespace_name) b
where a.tablespace_name = b.tablespace_name
order by a.tablespace_name
4.2.查看表空间使用率(包含temp临时表空间)
--查看表空间使用率(包含临时表空间)
select * from (
Select a.tablespace_name,
(a.bytes- b.bytes) "表空间使用大小(BYTE)",
a.bytes/(1024*1024*1024) "表空间大小(GB)",
b.bytes/(1024*1024*1024) "表空间剩余大小(GB)",
(a.bytes- b.bytes)/(1024*1024*1024) "表空间使用大小(GB)",
to_char((1 - b.bytes/a.bytes)*100,'99.99999') || '%' "使用率"
from (select tablespace_name,
sum(bytes) bytes
from dba_data_files
group by tablespace_name) a,
(select tablespace_name,
sum(bytes) bytes
from dba_free_space
group by tablespace_name) b
where a.tablespace_name = b.tablespace_name
union all
select c.tablespace_name,
d.bytes_used "表空间使用大小(BYTE)",
c.bytes/(1024*1024*1024) "表空间大小(GB)",
(c.bytes-d.bytes_used)/(1024*1024*1024) "表空间剩余大小(GB)",
d.bytes_used/(1024*1024*1024) "表空间使用大小(GB)",
to_char(d.bytes_used*100/c.bytes,'99.99999') || '%' "使用率"
from
(select tablespace_name,sum(bytes) bytes
from dba_temp_files group by tablespace_name) c,
(select tablespace_name,sum(bytes_cached) bytes_used
from v$temp_extent_pool group by tablespace_name) d
where c.tablespace_name = d.tablespace_name
)
order by tablespace_name
5.查看具体表的占用空间大小
--查看具体表的占用空间大小
select * from (
select t.tablespace_name,t.owner, t.segment_name, t.segment_type, sum(t.bytes / 1024 / 1024) mb
from dba_segments t
where t.segment_type='TABLE'
group by t.tablespace_name,t.OWNER, t.segment_name, t.segment_type
) t
order by t.mb desc
二、扩展大小或增加表空间文件
1.更改表空间的dbf数据文件分配空间大小
alter database datafile ‘...\system_01.dbf' autoextend on;
alter database datafile ‘...\system_01.dbf' resize 1024M;
2. 为表空间新增一个数据文件(表空间满32G不能扩展则增加表空间文件)
alter tablespace SYSTEM add datafile '/****' size 1000m autoextend on next 100m;
3. 如果是temp临时表新增表空间会报错:
0RA-03217: 变更TEMPORARY TABLESPACE 无效的选项
解决方法: datafile改为tempfile
alter tablespace TEMP01 add tempfile'/****' size 1000m autoextend on next 100m maxsize 10000m
针对temp临时表空间使用率爆满问题
临时表空间主要用途是在数据库进行排序运算、管理索引、访问视图等操作时提供临时的运算空间，当运算完成之后系统会自动清理，但有些时候我们会遇到临时段没有被释放，TEMP表空间几乎满使用率情况；
引起临时表空间增大主要使用在以下几种情况：
1、order by or group by (disc sort占主要部分)；
2、索引的创建和重创建；
3、distinct操作；
4、union & intersect & minus sort-merge joins；
5、Analyze 操作；
6、有些异常也会引起TEMP的暴涨。
解决方法一：用上述方法给temp增加表空间文件
解决方法二：在服务器资源空间有限的情况下，重新建立新的临时表空间替换当前的表空间
--1.查看当前的数据库默认表空间：
select * from database_properties
where property_name='DEFAULT_TEMP_TABLESPACE';
--2.创建新的临时表空间
create temporary tablespace TEMP01 tempfile
'/home/temp01.dbf' size 31G;
--3.更改默认临时表空间
alter database default temporary tablespace TEMP01;
--4.删除原来的临时表空间
drop tablespace TEMP02 including contents and datafiles;
--如果删除原来临时表空间报错ORA-60100：由于排序段，已阻止删除表空间...
--（说明有语句正在使用原来的临时表空间，需要将其kill掉再删除，此语句多为排序的语句）
--查询语句
Select se.username,se.sid,se.serial#,su.extents,su.blocks*to_number(rtrim(p.value))as Space,
tablespace,segtype,sql_text
from v$sort_usage su,v$parameter p,v$session se,v$sql s
where p.name='db_block_size' and su.session_addr=se.saddr and s.hash_value=su.sqlhash
and s.address=su.sqladdr
order by se.username,se.sid;
--删除对应的'sid,serial#'
alter system kill session 'sid,serial#'
附：查看表空间是否具有自动扩展的能力
--查看表空间是否具有自动扩展的能力
SELECT T.TABLESPACE_NAME,D.FILE_NAME,
D.AUTOEXTENSIBLE,D.BYTES,D.MAXBYTES,D.STATUS
FROM DBA_TABLESPACES T,DBA_DATA_FILES D
WHERE T.TABLESPACE_NAME =D.TABLESPACE_NAME
ORDER BY TABLESPACE_NAME,FILE_NAME;