postgresql查看数据库占用的物理存储空间大小 - JasmineLiu

时间:2024-03-08 18:51:07

1.手动查看:

查看数据库postgres的oid

postgres=# SELECT oid from pg_database where datname=\'postgres\';
oid
-------
12002
(1 行记录)

查找数据库的目录

D:\Program Files\PostgreSQL\9.2\data\base

查看名称为12002的文件的大小即是数据库postgres的大小;

linux可以以下命令替代

[root@arch 12002]# cd /var/lib/postgres/data/base/12002

[root@arch 12002]# du -sh

9.6M .

 

2.sql语句查询:

postgres=# select pg_size_pretty(pg_database_size(\'postgres\'));
pg_size_pretty
----------------
6229 kB
(1 行记录)

 

参考资料:

原文地址:http://www.cnblogs.com/mchina/archive/2013/04/19/3028573.html 作者:David_Tang

postgresql查看数据库、索引、表、表空间大小

一、简介

PostgreSQL 提供了多个系统管理函数来查看表,索引,表空间及数据库的大小,下面详细介绍一下。

二、数据库对象尺寸函数

函数名 返回类型 描述
pg_column_size(any) int 存储一个指定的数值需要的字节数(可能压缩过)
pg_database_size(oid) bigint 指定OID的数据库使用的磁盘空间
pg_database_size(name) bigint 指定名称的数据库使用的磁盘空间
pg_indexes_size(regclass) bigint 关联指定表OID或表名的表索引的使用总磁盘空间
pg_relation_size(relation regclass, fork text) bigint 指定OID或名的表或索引,通过指定fork(\'main\', \'fsm\' 或\'vm\')所使用的磁盘空间
pg_relation_size(relation regclass) bigint pg_relation_size(..., \'main\')的缩写
pg_size_pretty(bigint) text Converts a size in bytes expressed as a 64-bit integer into a human-readable format with size units
pg_size_pretty(numeric) text 把以字节计算的数值转换成一个人类易读的尺寸单位
pg_table_size(regclass) bigint 指定表OID或表名的表使用的磁盘空间,除去索引(但是包含TOAST,*空间映射和可视映射)
pg_tablespace_size(oid) bigint 指定OID的表空间使用的磁盘空间
pg_tablespace_size(name) bigint 指定名称的表空间使用的磁盘空间
pg_total_relation_size(regclass) bigint 指定表OID或表名使用的总磁盘空间,包括所有索引和TOAST数据

三、实例讲解

3.1 查看存储一个指定的数值需要的字节数

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david=# select pg_column_size(1);     
 pg_column_size 
----------------
              4
(1 row)

david=# select pg_column_size(10000);
 pg_column_size 
----------------
              4
(1 row)

david=# select pg_column_size(\'david\');
 pg_column_size 
----------------
              6
(1 row)

david=# select pg_column_size(\'hello,world\');
 pg_column_size 
----------------
             12
(1 row)

david=# select pg_column_size(\'2013-04-18 15:17:21.622885+08\');
 pg_column_size 
----------------
             30
(1 row)

david=# select pg_column_size(\'中国\');                         
 pg_column_size 
----------------
              7
(1 row)

david=# 
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3.2 查看数据库大小

查看原始数据

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david=# \d test
              Table "public.test"
  Column   |         Type          | Modifiers 
-----------+-----------------------+-----------
 id        | integer               | 
 name      | character varying(20) | 
 gender    | boolean               | 
 join_date | date                  | 
 dept      | character(4)          | 
Indexes:
    "idx_join_date_test" btree (join_date)
    "idx_test" btree (id)

david=# select count(1) from test;
  count  
---------
 1835008
(1 row)

david=# 
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查看david 数据库大小

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david=# select pg_database_size(\'david\');
 pg_database_size 
------------------
        190534776
(1 row)

david=# 
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查看所有数据库大小

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david=# select pg_database.datname, pg_database_size(pg_database.datname) AS size from pg_database;                
  datname  |    size     
-----------+-------------
 template0 |     6513156
 postgres  |     6657144
 jboss     |     6521348
 bugs      |     6521348
 david     |   190534776
 BMCV3     | 28147135608
 mydb      |    10990712
 template1 |     6521348
(8 rows)

david=# 
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这样查出来的结果,看上去太长了,不太容易读数。

3.3 以人性化的方式显示大小

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david=# select pg_size_pretty(pg_database_size(\'david\'));
 pg_size_pretty 
----------------
 182 MB
(1 row)

david=# 
复制代码

3.4 查看单索引大小

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david=# select pg_relation_size(\'idx_test\');
 pg_relation_size 
------------------
         41238528
(1 row)

david=# select pg_size_pretty(pg_relation_size(\'idx_test\'));
 pg_size_pretty 
----------------
 39 MB
(1 row)

david=# 
复制代码
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david=# select pg_size_pretty(pg_relation_size(\'idx_join_date_test\'));
 pg_size_pretty 
----------------
 39 MB
(1 row)

david=# 
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3.5 查看指定表中所有索引大小

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david=# select pg_indexes_size(\'test\');                  
 pg_indexes_size 
-----------------
        82477056
(1 row)

david=# select pg_size_pretty(pg_indexes_size(\'test\'));
 pg_size_pretty 
----------------
 79 MB
(1 row)

david=# 
复制代码

idx_test 和idx_join_date_test 两个索引大小加起来差不多等于上面pg_indexes_size() 查询出来的索引大小。

3.6 查看指定schema 里所有的索引大小,按从大到小的顺序排列。

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david=# select * from pg_namespace;
      nspname       | nspowner |               nspacl                
--------------------+----------+-------------------------------------
 pg_toast           |       10 | 
 pg_temp_1          |       10 | 
 pg_toast_temp_1    |       10 | 
 pg_catalog         |       10 | {postgres=UC/postgres,=U/postgres}
 information_schema |       10 | {postgres=UC/postgres,=U/postgres}
 public             |       10 | {postgres=UC/postgres,=UC/postgres}
(6 rows)

david=# select indexrelname, pg_size_pretty(pg_relation_size(relid)) from pg_stat_user_indexes where schemaname=\'public\' order by pg_relation_size(relid) desc;
         indexrelname          | pg_size_pretty 
-------------------------------+----------------
 idx_join_date_test            | 91 MB
 idx_test                      | 91 MB
 testtable_idx                 | 1424 kB
 city_pkey                     | 256 kB
 city11                        | 256 kB
 countrylanguage_pkey          | 56 kB
 sale_pkey                     | 8192 bytes
 track_pkey                    | 8192 bytes
 tbl_partition_201211_joindate | 8192 bytes
 tbl_partition_201212_joindate | 8192 bytes
 tbl_partition_201301_joindate | 8192 bytes
 tbl_partition_201302_joindate | 8192 bytes
 tbl_partition_201303_joindate | 8192 bytes
 customer_pkey                 | 8192 bytes
 album_pkey                    | 8192 bytes
 item_pkey                     | 8192 bytes
 tbl_partition_201304_joindate | 8192 bytes
 tbl_partition_201307_joindate | 8192 bytes
 tbl_partition_201305_joindate | 0 bytes
 tbl_partition_201306_joindate | 0 bytes
(20 rows)

david=# 
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3.7 查看指定表大小

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david=# select pg_relation_size(\'test\');                
 pg_relation_size 
------------------
         95748096
(1 row)

david=# select pg_size_pretty(pg_relation_size(\'test\'));
 pg_size_pretty 
----------------
 91 MB
(1 row)

david=# 
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使用pg_table_size() 函数查看

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david=# select pg_table_size(\'test\');                   
 pg_table_size 
---------------
      95789056
(1 row)

david=# select pg_size_pretty(pg_table_size(\'test\'));   
 pg_size_pretty 
----------------
 91 MB
(1 row)

david=# 
复制代码

3.8 查看指定表的总大小

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david=# select pg_total_relation_size(\'test\');       
 pg_total_relation_size 
------------------------
              178266112
(1 row)

david=# select pg_size_pretty(pg_total_relation_size(\'test\'));
 pg_size_pretty 
----------------
 170 MB
(1 row)

david=# 
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3.9 查看指定schema 里所有的表大小,按从大到小的顺序排列。

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david=# select relname, pg_size_pretty(pg_relation_size(relid)) from pg_stat_user_tables where schemaname=\'public\' order by pg_relation_size(relid) desc;
            relname            | pg_size_pretty 
-------------------------------+----------------
 test                          | 91 MB
 testtable                     | 1424 kB
 city                          | 256 kB
 countrylanguage               | 56 kB
 country                       | 40 kB
 testcount                     | 8192 bytes
 tbl_partition_201302          | 8192 bytes
 tbl_partition_201303          | 8192 bytes
 person                        | 8192 bytes
 customer                      | 8192 bytes
 american_state                | 8192 bytes
 tbl_david                     | 8192 bytes
 emp                           | 8192 bytes
 tbl_partition_201212          | 8192 bytes
 tbl_partition_201304          | 8192 bytes
 tbl_partition_error_join_date | 8192 bytes
 tbl_partition_201211          | 8192 bytes
 album                         | 8192 bytes
 tbl_partition_201307          | 8192 bytes
 tbl_xulie                     | 8192 bytes
 tbl_partition_201301          | 8192 bytes
 sale                          | 8192 bytes
 item                          | 8192 bytes
 track                         | 8192 bytes
 tbl_partition_201306          | 0 bytes
 tbl_partition                 | 0 bytes
 tbl_partition_201305          | 0 bytes
 person2                       | 0 bytes
(28 rows)

david=# 
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3.10 查看表空间大小

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david=# select spcname from pg_tablespace;
  spcname   
------------
 pg_default
 pg_global
(2 rows)

david=# select pg_tablespace_size(\'pg_default\');                
 pg_tablespace_size 
--------------------
        28381579760
(1 row)

david=# select pg_size_pretty(pg_tablespace_size(\'pg_default\'));
 pg_size_pretty 
----------------
 26 GB
(1 row)

david=# 
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另一种查看方法:

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david=# select pg_tablespace_size(\'pg_default\')/1024/1024 as "SIZE M";     
 SIZE M 
--------
  27066
(1 row)

david=# select pg_tablespace_size(\'pg_default\')/1024/1024/1024 as "SIZE G"; 
 SIZE G 
--------
     26
(1 row)

david=#