Oracle : check possible resize value for a datafile

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SCRIPT TO CALCUTE POSSIBLE RESIZE VALUE

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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(+)

/



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_temp_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

/





select ‘alter database tempfile ”’ || file_name || ”’ resize ‘ ||

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

from dba_temp_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

/