PostgreSQL列表和订单表的大小

如何列出 PostgreSQL数据库的所有表并按大小排序？

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

public如果您具有多个架构，则可能会使用以下图表来显示架构中所有表的大小：

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

手册中所有对象尺寸功能的列表。

这将显示架构名称，表名称，漂亮大小和大小（需要排序）。

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）大小的模式列表的解决方案来构建此数据库

这将更加清楚。

pg_size_pretty(<numeric_value>) -将字节数转换为可读格式。

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

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

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

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。

查询：

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

人性化的格式表示bytes，kB，MB，GB，和TB。

bytes至kB-从10240 bytes

bytes至MB-从10485248 bytes= 10239.5 kB〜开始10 MB

bytes至GB-从10736893952 bytes= 10239.5 MB〜开始10 BG

bytes至TB-从10994579406848 bytes= 10239.5 GB〜开始10 TB

所有单位转换均始于10 + <unit>。

供参考-Postgres官方文档

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;

从此处获取https://wiki-bsse.ethz.ch/display/ITDOC/Check+size+of+tables+and+objects+in+PostgreSQL+database

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

我需要查找哪些表使用最多的空间。

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。

 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