重设数据文件大小sql语句

set verify off

column file_name format a50 word_wrapped

column smallest format 999,990 heading "Smallest|Size|Poss."

column currsize format 999,990 heading "Current|Size"

column savings format 999,990 heading "Poss.|Savings"

break on report

compute sum of savings on report

 

column value new_val blksize

select value from v$parameter where name = 'db_block_size'

/ 

 

select file_name,

       ceil( (nvl(hwm,1)*&&blksize)/1024/1024 ) smallest,

       ceil( blocks*&&blksize/1024/1024) currsize,

       ceil( blocks*&&blksize/1024/1024) -

       ceil( (nvl(hwm,1)*&&blksize)/1024/1024 ) savings

from dba_data_files a,

     ( select file_id, max(block_id+blocks-1) hwm

         from dba_extents

        group by file_id ) b

where a.file_id = b.file_id(+)

/ 

 

column cmd format a120 word_wrapped

 

select 'alter database datafile '''||file_name||''' resize ' ||

       ceil( (nvl(hwm,1)*&&blksize)/1024/1024 ) || 'm;' cmd

from dba_data_files a,

     ( select file_id, max(block_id+blocks-1) hwm

         from dba_extents

        group by file_id ) b

where a.file_id = b.file_id(+)

  and ceil( blocks*&&blksize/1024/1024) -

      ceil( (nvl(hwm,1)*&&blksize)/1024/1024 ) > 0;