db2 - 如何检查表在 DB2 中使用了多少空间

Question

DB2 中是否有一种方法可以识别一个表正在消耗分配给底层表空间的总空间的多少。”

谢谢

Answer 1

DB2 查询以检查表大小

select 
   a.CARD*(sum(b.AVGCOLLEN)+10)/1024/1024 as Tablesize_in_MB 
from 
   syscat.tables as a, syscat.columns as b 
where 
   a.TABNAME = b.TABNAME and b.TABNAME = 'TABLE_NAME' group by a.CARD

数据大小

select 
  char(date(t.stats_time))||' '||char(time(t.stats_time)) as statstime 
  ,substr(t.tabschema,1,8)||'.'||substr(t.tabname,1,24) as tabname 
  ,card as rows_per_table 
  ,decimal(float(t.npages)/ ( 1024 / (b.pagesize/1024)),9,2) as used_mb 
  ,decimal(float(t.fpages)/ ( 1024 / (b.pagesize/1024)),9,2) as allocated_mb 
from 
  syscat.tables t , syscat.tablespaces b 
where t.tbspace=b.tbspace 
order by 5 desc with ur

索引大小

select 
  rtrim(substr(i.tabschema,1,8))||'.'||rtrim(substr( i.tabname, 1,24)) as tabname 
 ,decimal(sum(i.nleaf)/( 1024 / (b.pagesize/1024)),12,2) as indx_used_per_table_mb 
from 
   syscat.indexes i, syscat.tables t , syscat.tablespaces b 
where 
   i.tabschema is not null and i.tabname=t.tabname 
   and i.tabschema=t.tabschema and t.tbspace=b.tbspace 
group by 
   i.tabname,i.tabschema, b.pagesize order by 2 desc with ur