oracle 调整表空间大小 (resize)

版权声明:欢迎加入Oracle 技术分享群:425614362 如果有不对的地方还请指正! https://blog.csdn.net/shiyu1157758655/article/details/84953401

有的时候为了解决磁盘空间不足等情况,需要把一些表空间大小resize一下,其实语句很简单,如下:

SQL> ALTER DATABASE
  2    TEMPFILE '/opt/database/ebs/db/data/temp12.dbf'
  3   RESIZE 4G;
ALTER DATABASE
*
ERROR at line 1:
ORA-03297: file contains used data beyond requested RESIZE value

如上:ora-03297 报错估计大家在resize的时候会经常遇到,那么如何判定resize 大小准确的大小呢,下面给出一个脚本,利用该脚本来生成resize语句:

相关脚本连接:https://support.oracle.com/epmos/faces/DocumentDisplay?_afrLoop=254440300234769&id=130866.1&_afrWindowMode=0&_adf.ctrl-state=b3zfmsxmq_4

具体如下:

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 */

<<check_free>>

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 <= c_file.file_min_size)
then

dbms_output.put_line('Tablespace: '||c_file.tablespace_name||' Datafile: '||c_file.file_name);
dbms_output.put_line('cannot be resized no free extents found');
dbms_output.put_line('Note: for some cases, dba_free_spaces data is not accurate, and this script does not work for such cases. You may want to manually check if the datafile is feasible to be resized');
dbms_output.put_line('.');

else

/* file needs minimal no of blocks which does vary over versions,
using safe value of 128 {+ initial_extent} */
if file_min_block < c_file.file_min_size
then
file_min_block := c_file.file_min_size;
end if;


dbms_output.put_line('Tablespace: '||c_file.tablespace_name||' Datafile: '||c_file.file_name);
dbms_output.put_line('current size: '||(c_file.blocks*c_file.block_size)/1024||'K'||' can be resized to: '||round((file_min_block*c_file.block_size)/1024)||'K (reduction of: '||round(((c_file.blocks-file_min_block)/c_file.blocks)*100,2)||' %)');


/* below is only true if recyclebin is on */
if recycle_bin
then
begin
sqlstr:='select distinct 1 from recyclebin$ where file#='||c_file.file_id;
execute immediate sqlstr into dummy;

if dummy > 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;
/

将上面的脚本保存到oracle_check_resize.sql,然后我们运行一下:

[orahec@db-hx-189-208 awr]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Tue Dec 11 11:26:15 2018

Copyright (c) 1982, 2013, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> spool oracle_check_resize.txt
SQL> @oracle_check_resize.sql

PL/SQL procedure successfully completed.

Tablespace: HEC_DATA Datafile: /opt/Oracle/hecdb/oradata/HEC/hecdata01.dbf
cannot be resized no free extents found
Note: for some cases, dba_free_spaces data is not accurate, and this script does
not work for such cases. You may want to manually check if the datafile is
feasible to be resized
.
Tablespace: HEC_DATA Datafile: /opt/Oracle/hecdb/oradata/HEC/hecdata02.dbf
cannot be resized no free extents found
Note: for some cases, dba_free_spaces data is not accurate, and this script does
not work for such cases. You may want to manually check if the datafile is
feasible to be resized
.
Tablespace: HEC_DATA Datafile: /opt/Oracle/hecdb/oradata/HEC/hecdata03.dbf
current size: 16777216K can be resized to: 14888960K (reduction of: 11.25 %)
SQL> alter database datafile '/opt/Oracle/hecdb/oradata/HEC/hecdata03.dbf'
resize 14888960K;
.
Tablespace: HEC_DATA Datafile: /opt/Oracle/hecdb/oradata/HEC/hecdata04.dbf
cannot be resized no free extents found
Note: for some cases, dba_free_spaces data is not accurate, and this script does
not work for such cases. You may want to manually check if the datafile is
feasible to be resized
.
Tablespace: SYSAUX Datafile: /opt/Oracle/hecdb/oradata/HEC/sysaux01.dbf
cannot be resized no free extents found
Note: for some cases, dba_free_spaces data is not accurate, and this script does
not work for such cases. You may want to manually check if the datafile is
feasible to be resized
.
Tablespace: SYSAUX Datafile: /opt/Oracle/hecdb/oradata/HEC/sysaux02.dbf
current size: 5242880K can be resized to: 190464K (reduction of: 96.37 %)
SQL> alter database datafile '/opt/Oracle/hecdb/oradata/HEC/sysaux02.dbf' resize
190464K;
.
Tablespace: SYSTEM Datafile: /opt/Oracle/hecdb/oradata/HEC/system01.dbf
cannot be resized no free extents found
Note: for some cases, dba_free_spaces data is not accurate, and this script does
not work for such cases. You may want to manually check if the datafile is
feasible to be resized
.
Tablespace: SYSTEM Datafile: /opt/Oracle/hecdb/oradata/HEC/system02.dbf
current size: 8007680K can be resized to: 8001536K (reduction of: .08 %)
SQL> alter database datafile '/opt/Oracle/hecdb/oradata/HEC/system02.dbf' resize
8001536K;
.
Tablespace: SYSTEM Datafile: /opt/Oracle/hecdb/oradata/HEC/system03.dbf
current size: 16777216K can be resized to: 1378304K (reduction of: 91.78 %)
SQL> alter database datafile '/opt/Oracle/hecdb/oradata/HEC/system03.dbf' resize
1378304K;
.
Tablespace: UNDOTBS1 Datafile: /opt/Oracle/hecdb/oradata/HEC/undotbs01.dbf
current size: 28385280K can be resized to: 24642624K (reduction of: 13.19 %)
SQL> alter database datafile '/opt/Oracle/hecdb/oradata/HEC/undotbs01.dbf'
resize 24642624K;
.
Tablespace: USERS Datafile: /opt/Oracle/hecdb/oradata/HEC/users01.dbf
current size: 5120K can be resized to: 1344K (reduction of: 73.75 %)
SQL> alter database datafile '/opt/Oracle/hecdb/oradata/HEC/users01.dbf' resize
1344K;
.

PL/SQL procedure successfully completed.

SQL> exit

猜你喜欢

转载自blog.csdn.net/shiyu1157758655/article/details/84953401