为什么看不到我的架构大小 [英] why cant see my schema size
问题描述
如果您用Google搜索 postgresql表大小,则会得到此查询。
但未在结果中显示:
为什么 app
模式未显示在结果中?
我尝试第二个 查询 ,还限制了空结果。
从information_schema.tables
中选择table_name,pg_relation_size(table_name)
,其中table_schema ='app'
订单2
不幸的是,甚至psql命令l ine工具不会显示架构中所有对象的总大小。所有命令,例如用于数据库的 \l +或用于表的 \dt +,都以 +形式显示。
从pg_class中选择可能是最好的选择,但不仅针对 r进行过滤-模式还包含索引和其他对象。
If you google for "postgresql table size" you get this nice query. https://wiki.postgresql.org/wiki/Disk_Usage
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;
I have a schema app
:
But doesnt show in the result:
Why app
schema doesnt show in the result?
I try a second query, and also returm empty result.
select table_name, pg_relation_size(table_name)
from information_schema.tables
where table_schema = 'app'
order by 2
Unfortunately even psql command line tool does not show total size of all objects in schema. All commands like "\l+" for databases or "\dt+" for tables show in "+" form also total size. Only "\dn+" for schemas does not show size.
Select from pg_class is probably the best but do not filter only for "r" - schemas contain also indexes and other objects.
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