175

如何列出PostgreSQL 数据库的所有表并按大小排序

4

11 回答 11

231
select table_name, pg_relation_size(quote_ident(table_name))
from information_schema.tables
where table_schema = 'public'
order by 2

如果您有多个模式,这将向您显示模式中所有表的大小public,您可能希望使用:

select table_schema, table_name, pg_relation_size('"'||table_schema||'"."'||table_name||'"')
from information_schema.tables
order by 3

SQLFiddle 示例:http ://sqlfiddle.com/#!15/13157/3

手册中所有对象大小函数的列表。

于 2014-02-12T20:07:49.390 回答
132

这将向您显示架构名称、表名、大小和大小(排序所需)。

SELECT
  schema_name,
  relname,
  pg_size_pretty(table_size) AS size,
  table_size

FROM (
       SELECT
         pg_catalog.pg_namespace.nspname           AS schema_name,
         relname,
         pg_relation_size(pg_catalog.pg_class.oid) AS table_size

       FROM pg_catalog.pg_class
         JOIN pg_catalog.pg_namespace ON relnamespace = pg_catalog.pg_namespace.oid
     ) t
WHERE schema_name NOT LIKE 'pg_%'
ORDER BY table_size DESC;

我基于PostgreSQL 数据库中具有大小(相对和绝对)的架构列表中的解决方案构建它

于 2014-02-12T20:19:22.020 回答
43

这会更清楚。

pg_size_pretty(<numeric_value>)- 将字节数转换为人类可读的格式。

pg_database_size(<db_name>)- 以字节为单位获取数据库大小。

pg_total_relation_size(<relation_name>)- 获取表的总大小及其索引(以字节为单位)。

pg_relation_size(<relation_name>)- 以字节为单位获取关系(表/索引)大小。

pg_index_size(<relation_name>)- 获取关系的索引大小(以字节为单位)。

current_database()- 获取正在执行此查询的当前使用的数据库。

询问:

select current_database() as database,
       pg_size_pretty(total_database_size) as total_database_size,
       schema_name,
       table_name,
       pg_size_pretty(total_table_size) as total_table_size,
       pg_size_pretty(table_size) as table_size,
       pg_size_pretty(index_size) as index_size
       from ( select table_name,
                table_schema as schema_name,
                pg_database_size(current_database()) as total_database_size,
                pg_total_relation_size(table_name) as total_table_size,
                pg_relation_size(table_name) as table_size,
                pg_indexes_size(table_name) as index_size
                from information_schema.tables
                where table_schema=current_schema() and table_name like 'table_%'
                order by total_table_size
            ) as sizes;

结果:

 database  | total_database_size | schema_name | table_name | total_table_size | table_size | index_size
-----------+---------------------+-------------+------------+------------------+------------+------------
 vigneshdb | 1586 MB             | corpdata    | table_aaa  | 16 kB            | 0 bytes    | 8192 bytes
 vigneshdb | 1586 MB             | corpdata    | table_bbb  | 24 kB            | 0 bytes    | 16 kB
 vigneshdb | 1586 MB             | corpdata    | table_ccc  | 640 kB           | 112 kB     | 488 kB
 vigneshdb | 1586 MB             | corpdata    | table_ddd  | 9760 kB          | 3152 kB    | 6568 kB
 vigneshdb | 1586 MB             | corpdata    | table_eee  | 1120 MB          | 311 MB     | 808 MB

人性化格式以byteskBMBGB和表示TB

byteskB- 开始于10240 bytes

bytesto MB- 从10485248 bytes= 10239.5 kB~开始10 MB

bytesto GB- 从10736893952 bytes= 10239.5 MB~开始10 BG

bytesto TB- 从10994579406848 bytes= 10239.5 GB~开始10 TB

所有单位转换从10 + <unit>.

供参考 - Postgres 官方文档

于 2018-10-08T16:44:42.970 回答
19
SELECT
   relname as "Table",
   pg_size_pretty(pg_total_relation_size(relid)) As "Size",
   pg_size_pretty(pg_total_relation_size(relid) - pg_relation_size(relid)) as "External Size"
   FROM pg_catalog.pg_statio_user_tables ORDER BY pg_total_relation_size(relid) DESC;

取自这里https://wiki-bsse.ethz.ch/display/ITDOC/Check+size+of+tables+and+objects+in+PostgreSQL+database

于 2017-03-10T14:11:24.283 回答
15

我需要找出哪些表使用的空间最多。

根据其他答案,我使用了该查询:

select table_name, pg_size_pretty( pg_relation_size(quote_ident(table_name)) )
from information_schema.tables
where table_schema = 'public'
order by pg_relation_size(quote_ident(table_name)) desc

我得到以下结果:

table_name              pg_size_pretty
--------------------------------------
trade_binance           96 GB
closs_v2_binance_stash  46 GB
closs_bitfinex_stash    5725 MB
trade_bitfinex          5112 MB
...
api_requests            0 bytes
trade_huobi             0 bytes

我应该买一个更大的SSD。

于 2019-11-18T14:06:58.203 回答
11

我喜欢下面的陈述:

SELECT 
  table_name, 
  pg_size_pretty( pg_total_relation_size(quote_ident(table_name))), 
  pg_total_relation_size(quote_ident(table_name))
FROM 
  information_schema.tables
WHERE 
  table_schema = 'public'
ORDER BY 
  pg_total_relation_size(quote_ident(table_name)) DESC

您可以以漂亮的格式查看总尺寸,但它的排序也正确。

于 2020-10-30T11:43:27.973 回答
5
select table_name,n_live_tup, pg_size_pretty(pg_relation_size(table_name))
from information_schema.tables
inner join pg_stat_user_tables  on table_name=relname
where table_schema = 'public'
order by 2 desc

另一种选择

于 2015-04-27T01:38:22.130 回答
5
SELECT nspname || '.' || relname AS "relation",
    pg_size_pretty(pg_total_relation_size(C.oid)) AS "total_size"
  FROM pg_class C
  LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
  WHERE nspname NOT IN ('pg_catalog', 'information_schema')
    AND C.relkind <> 'i'
    AND nspname !~ '^pg_toast'
  ORDER BY pg_total_relation_size(C.oid) DESC
  ;

信用: https ://makandracards.com/makandra/52141-postgresql-how-to-show-table-sizes

于 2021-06-21T12:46:15.143 回答
2
 select uv.a tablename, pg_size_pretty(uv.b) sizepretty 
 from (select tb.tablename a, pg_table_size('schemaname.'||tb.tablename::text) b 
        from pg_tables tb 
        where tb.schemaname ilike 'schemaname' 
        order by 2 desc
       ) uv
于 2016-01-12T06:00:55.460 回答
2
select table_name, pg_size_pretty(pg_total_relation_size(quote_ident(table_name)))
from information_schema.tables
where table_schema = 'public'
order by pg_total_relation_size(quote_ident(table_name));

pg_total_relation_size将包括索引和表的大小。如果您只想要表格大小,那就pg_relation_size足够了。

于 2020-11-18T10:16:59.487 回答
1

如果您正在寻找总的细分,toast 和 index 大小使用这个:

SELECT *, pg_size_pretty(total_bytes) AS total
, pg_size_pretty(index_bytes) AS INDEX
, pg_size_pretty(toast_bytes) AS toast
, pg_size_pretty(table_bytes) AS TABLE
FROM (
SELECT *, total_bytes-index_bytes-COALESCE(toast_bytes,0) AS table_bytes 
FROM (
  SELECT c.oid,nspname AS table_schema, relname AS TABLE_NAME
          , c.reltuples AS row_estimate
          , pg_total_relation_size(c.oid) AS total_bytes
          , pg_indexes_size(c.oid) AS index_bytes
          , pg_total_relation_size(reltoastrelid) AS toast_bytes
      FROM pg_class c
      LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
      WHERE relkind = 'r'
  ) a
) a ORDER BY total_bytes DESC;
于 2021-11-24T23:09:44.413 回答