drop table tablesize

create table tablesize( phone int)

create table tablesize( phone text)

create table tablesize( phone char(30))

create table tablesize( phone varchar(3000))

create index i_table_size_phone on tablesize(phone)

insert into tablesize values('1111')

insert into tablesize values(1111)

 

select pg_size_pretty(pg_relation_size('tablesize'))--表达小，不包含索引和toast

 

select pg_size_pretty(pg_relation_size('i_table_size_phone'))--索引大小

select pg_size_pretty(pg_total_relation_size('tablesize')); --表达小包含toast，和索引大小

 

select pg_size_pretty(pg_table_size('tablesize'))--表达小，包含toast大小

 

 

select oid from pg_database where datname = 'test'

 

select pg_relation_filepath('tablesize');

 

select pg_column_size('phone')

--查看表大小和索引大小

select relname,pg_size_pretty(pg_relation_size(oid)) from pg_class where relname like '%t1%' order by relname;

 

select oid,relfilenode,relname from pg_class where relfilenode = '20221126'

select oid,relfilenode,relname from pg_class where relfilenode = '20221113'

 

pg查看表膨胀：

查看表膨胀（对所有表产进行膨胀率排序）

 

SQL文如下：

 

SELECT

schemaname||'.'||relname as table_name,

pg_size_pretty(pg_relation_size(schemaname||'.'||relname)) as table_size,

n_dead_tup,

n_live_tup,

round(n_dead_tup * 100 / (n_live_tup + n_dead_tup),2) AS dead_tup_ratio

FROM

pg_stat_all_tables

WHERE

n_dead_tup >= 1000

ORDER BY dead_tup_ratio DESC

LIMIT 10;