如何找到Postgres / PostgreSQL表及其索引的磁盘大小

我是从Oracle来的Pos​​tgres，正在寻找一种方法来查找表和索引的大小bytes/MB/GB/etc，甚至更好的是所有表的大小。在Oracle中，我有一个讨厌的长查询，它查看了user_lobs和user_segments并给出了答案。

我假设在Postgres中可以在information_schema表中使用某些东西，但是我看不到哪里。

尝试使用数据库对象大小函数。一个例子：

SELECT pg_size_pretty(pg_total_relation_size('"<schema>"."<table>"'));

对于所有表，类似以下内容：

SELECT
    table_schema || '.' || table_name AS table_full_name,
    pg_size_pretty(pg_total_relation_size('"' || table_schema || '"."' || table_name || '"')) AS size
FROM information_schema.tables
ORDER BY
    pg_total_relation_size('"' || table_schema || '"."' || table_name || '"') DESC;

编辑：这是@phord提交的查询，为方便起见：

SELECT
    table_name,
    pg_size_pretty(table_size) AS table_size,
    pg_size_pretty(indexes_size) AS indexes_size,
    pg_size_pretty(total_size) AS total_size
FROM (
    SELECT
        table_name,
        pg_table_size(table_name) AS table_size,
        pg_indexes_size(table_name) AS indexes_size,
        pg_total_relation_size(table_name) AS total_size
    FROM (
        SELECT ('"' || table_schema || '"."' || table_name || '"') AS table_name
        FROM information_schema.tables
    ) AS all_tables
    ORDER BY total_size DESC
) AS pretty_sizes;

我对其进行了少许修改，pg_table_size()以包括元数据并增加大小。

显示数据库大小：

\l+

例如

=> \l+
 berbatik_prd_commerce    | berbatik_prd     | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                       | 19 MB   | pg_default | 
 berbatik_stg_commerce    | berbatik_stg     | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                       | 8633 kB | pg_default | 
 bursasajadah_prd         | bursasajadah_prd | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                       | 1122 MB | pg_default | 

显示表格大小：

\d+

例如

=> \d+
 public | tuneeca_prd | table | tomcat | 8192 bytes | 
 public | tuneeca_stg | table | tomcat | 1464 kB    | 

仅适用于psql。

（@zkutch的答案摘要。）

如果数据库名称为snort，则以下语句为其指定大小：

psql -c "\l+ snort" | awk -F "|" '{print $7}'

这：（索引大小/使用情况统计）

SELECT
    t.tablename,
    indexname,
    c.reltuples AS num_rows,
    pg_size_pretty(pg_relation_size(quote_ident(t.tablename)::text)) AS table_size,
    pg_size_pretty(pg_relation_size(quote_ident(indexrelname)::text)) AS index_size,
    CASE WHEN indisunique THEN 'Y'
       ELSE 'N'
    END AS UNIQUE,
    idx_scan AS number_of_scans,
    idx_tup_read AS tuples_read,
    idx_tup_fetch AS tuples_fetched
FROM pg_tables t
LEFT OUTER JOIN pg_class c ON t.tablename=c.relname
LEFT OUTER JOIN
    ( SELECT c.relname AS ctablename, ipg.relname AS indexname, x.indnatts AS number_of_columns, idx_scan, idx_tup_read, idx_tup_fetch, indexrelname, indisunique FROM pg_index x
           JOIN pg_class c ON c.oid = x.indrelid
           JOIN pg_class ipg ON ipg.oid = x.indexrelid
           JOIN pg_stat_all_indexes psai ON x.indexrelid = psai.indexrelid )
    AS foo
    ON t.tablename = foo.ctablename
WHERE t.schemaname='public'
ORDER BY 1,2;

PostgreSQL表具有三个组成部分：表本身，表上的任何索引以及潜在的TOAST数据。在http://wiki.postgresql.org/wiki/Disk_Usage上有几个示例展示了如何将可用信息滑动和切块

仅出于信息方面，我从@aib获得了出色的答案，并对其进行了一些修改：

• 仅从“公共”模式中获取表
• 还显示物化视图数据和索引大小

在实例化视图上，我们可以使用索引来同时刷新实例化视图，这允许在更新时使用它们。

好吧，我的查询将是以下内容：

SELECT
    table_name,
    pg_size_pretty(table_size) AS table_size,
    pg_size_pretty(indexes_size) AS indexes_size,
    pg_size_pretty(total_size) AS total_size
FROM (
    SELECT
        table_name,
        pg_table_size(table_name) AS table_size,
        pg_indexes_size(table_name) AS indexes_size,
        pg_total_relation_size(table_name) AS total_size
    FROM (
        -- tables from 'public'
        SELECT table_name
        FROM information_schema.tables
        where table_schema = 'public' and table_type = 'BASE TABLE'
        union
        -- materialized views
        SELECT oid::regclass::text as table_name
        FROM pg_class
        WHERE relkind = 'm'
        order by table_name
    ) AS all_tables
    -- ORDER BY total_size DESC
    order by table_name
) AS pretty_sizes

以下查询将为您服务

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
LIMIT 20;

看到此链接：https : //wiki.postgresql.org/wiki/Disk_Usage

检查此Wiki。 https://wiki.postgresql.org/wiki/Disk_Usage

SELECT *，pg_size_pretty（total_bytes）作为总数
    ，pg_size_pretty（index_bytes）作为索引
    ，pg_size_pretty（toast_bytes）AS吐司
    ，pg_size_pretty（table_bytes）如表
  来自（
  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
          从pg_class c
          左联接pg_namespace n ON n.oid = c.relnamespace
          在哪里relkind ='r'
  ） 一个
） 一个

尝试使用以下脚本查找所有表大小：

SELECT
    table_schema || '.' || table_name AS TableName,
    pg_size_pretty(pg_total_relation_size('"' || table_schema || '"."' || table_name || '"')) AS TableSize
FROM information_schema.tables
ORDER BY
    pg_total_relation_size('"' || table_schema || '"."' || table_name || '"') DESC

有关在PostgreSQL中查找大小的其他不同脚本，请访问以下URL：http : //www.dbrnd.com/2015/05/how-to-find-size-of-database-and-table-in-postgresql/