oracle 調整表空間大小 (resize)
阿新 • • 發佈：2018-12-11
有的時候為了解決磁碟空間不足等情況，需要把一些表空間大小resize一下，其實語句很簡單，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 報錯估計大家在resize的時候會經常遇到，那麼如何判定resize 大小準確的大小呢，下面給出一個指令碼，利用該指令碼來生成resize語句：
具體如下：
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; /
將上面的指令碼儲存到oracle_check_resize.sql,然後我們執行一下：
[[email protected] 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