分享一个脚本，PostgreSQL 查看表段大小（包含分区表）及条目数_pgsql查看每个分片的大小

分享一个脚本，PostgreSQL 查看表段大小（包含分区表）及条目数

select * from  
(select t.relname, (case when r.relkind = 'p' then 'Y' else 'N' end) as partition_YN,
    --pg_size_pretty(pg_relation_size(relid)) as "table_size", 
    pg_relation_size(relid)/1024/1024 as "size_Mb", 
    to_char(r.reltuples,'999999999999999999999') as "table_cnt"
from pg_stat_user_tables t
inner join pg_namespace n 
  on t.schemaname = n.nspname
inner join pg_class r 
    on r.relname = t.relname
    and r.relnamespace = n.oid 
    and r.oid not in (select inhrelid from pg_inherits where inhparent in (select partrelid from pg_partitioned_table))  --排除分区
where t.schemaname='mapr'

union all --查看分区表大小

select t1.relname as parent_tab, (case when t1.relkind = 'p' then 'Y' else 'N' end) as partition_YN,
	sum(pg_table_size(c.oid))/1024/1024 as  "size_Mb", --i.inhparent ,
  to_char(sum(c.reltuples),'999999999999999999999') as "table_cnt"
FROM pg_class t1
join pg_inherits i 
  on t1.oid = i.inhparent
join pg_catalog.pg_class c  --for partition
  on c.oid = i.inhrelid 
where t1.relnamespace = (select oid from pg_namespace where nspname = 'mapr')
  and t1.relkind IN ('r','p')
group by t1.relname,i.inhparent ,t1.relkind 
) tt
order by 3 desc ;
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效果如下：