Reclaim Oracle Database free space

 

Reclaim Oracle Database free space

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 a75 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 

/