REM Script is meant for Oracle version 9 and higher
REM -----------------------------------------------
set serveroutput on
exec dbms_output.enable(1000000);
declare
cursor c_dbfile is
select f.tablespace_name,f.file_name,f.file_id,f.blocks,t.block_size
,decode(t.allocation_type,'UNIFORM',t.initial_extent/t.block_size,0) uni_extent
,decode(t.allocation_type,'UNIFORM',(128+(t.initial_extent/t.block_size)),128) file_min_size
from dba_data_files f,
dba_tablespaces t
where f.tablespace_name = t.tablespace_name
and t.status = 'ONLINE'
order by f.tablespace_name,f.file_id;
cursor c_freespace(v_file_id in number) is
select block_id, block_id+blocks max_block
from dba_free_space
where file_id = v_file_id
order by block_id desc;
/* variables to check settings/values */
dummy number;
checkval varchar2(10);
block_correction1 number;
block_correction2 number;
/* running variable to show (possible) end-of-file */
file_min_block number;
/* variables to check if recycle_bin is on and if extent as checked is in ... */
recycle_bin boolean:=false;
extent_in_recycle_bin boolean;
/* exception handler needed for non-existing tables note:344940.1 */
sqlstr varchar2(100);
table_does_not_exist exception;
pragma exception_init(table_does_not_exist,-942);
/* variable to spot space wastage in datafile of uniform tablespace */
space_wastage number;
begin
/* recyclebin is present in Oracle 10.2 and higher and might contain extent as checked */
begin
select value into checkval from v$parameter where name = 'recyclebin';
if checkval = 'on'
then
recycle_bin := true;
end if;
exception
when no_data_found
then
recycle_bin := false;
end;
/* main loop */
for c_file in c_dbfile
loop
/* initialization of loop variables */
dummy :=0;
extent_in_recycle_bin := false;
file_min_block := c_file.blocks;
begin
space_wastage:=0; /* reset for every file check */
for c_free in c_freespace(c_file.file_id)
loop
/* if blocks is an uneven value there is a need to correct
with -1 to compare with end-of-file which is even */
block_correction1 := (0-mod(c_free.max_block,2));
block_correction2 := (0-mod(c_file.blocks,2));
if file_min_block+block_correction2 = c_free.max_block+block_correction1
then
/* free extent is at end so file can be resized */
file_min_block := c_free.block_id;
/* Uniform sized tablespace check if space at end of file
is less then uniform extent size */
elsif (c_file.uni_extent !=0) and ((c_file.blocks - c_free.max_block) < c_file.uni_extent)
then
/* uniform tablespace which has a wastage of space in datafile
due to fact that space at end of file is smaller than uniform extent size */
space_wastage:=c_file.blocks - c_free.max_block;
file_min_block := c_free.block_id;
else
/* no more free extent at end of file, file cannot be further resized */
exit check_free;
end if;
end loop;
end;
/* check if file can be resized, minimal size of file 128 {+ initial_extent} blocks */
if (file_min_block = c_file.blocks) or (c_file.blocks 0
then
dbms_output.put_line('Extents found in recyclebin for above file/tablespace');
dbms_output.put_line('Implying that purge of recyclebin might be needed in order to resize');
dbms_output.put_line('SQL> purge tablespace '||c_file.tablespace_name||';');
end if;
exception
when no_data_found
then null;
when table_does_not_exist
then null;
end;
end if;
dbms_output.put_line('SQL> alter database datafile '''||c_file.file_name||''' resize '||round((file_min_block*c_file.block_size)/1024)||'K;');
if space_wastage!=0
then
dbms_output.put_line('Datafile belongs to uniform sized tablespace and is not optimally sized.');
dbms_output.put_line('Size of datafile is not a multiple of NN*uniform_extent_size + overhead');
dbms_output.put_line('Space that cannot be used (space wastage): '||round((space_wastage*c_file.block_size)/1024)||'K');
dbms_output.put_line('For optimal usage of space in file either resize OR increase to: '||round(((c_file.blocks+(c_file.uni_extent-space_wastage))*c_file.block_size)/1024)||'K');
end if;
dbms_output.put_line('.');
end if;
end loop;
end;
/
-------------------------------------------------------------------------------------
输出结果类似
Tablespace: TEST Datafile: +DG1/test01.dbf
current size: 11264K can be resized to: 4096K (reduction of: 63.64 %)
Extents found in recyclebin for above file/tablespace
Implying that purge of recyclebin might be needed in order to resize
SQL> purge tablespace TEST;
SQL> alter database datafile '+DG1/test01.dbf' resize 4096K;
Datafile belongs to uniform sized tablespace and is not optimally sized.
Size of datafile is not a multiple of NN*uniform_extent_size + overhead
Space that cannot be used (space wastage): 1024K
For optimal usage of space in file either resize OR increase to: 13312K
.
Tablespace: TEST Datafile: +DG2/test02.dbf
current size: 10240K can be resized to: 4096K (reduction of: 60 %)
SQL> alter database datafile '+DG2/test02.dbf' resize 4096K;
.
Tablespace: UNDOTBS1 Datafile: /oradata/v1122/undotbs01.dbf
current size: 660480K can be resized to: 103424K (reduction of: 84.34 %)
SQL> alter database datafile '/oradata/v1122/undotbs01.dbf' resize 103424K;
.
Tablespace: USERS Datafile: /oradata/v1122/users01.dbf
cannot be resized no free extents found
