oracle show_space脚本

show_space脚本打印数据库段的空间利用率信息:

createorreplaceprocedureshow_space

(p_segnameinvarchar2,

p_ownerinvarchar2defaultuser,

p_typeinvarchar2default'TABLE',

p_partitioninvarchar2defaultNULL)

--thisprocedureusesauthidcurrentusersoitcanqueryDBA_*

--viewsusingprivilegesfromaROLEandsoitcanbeinstalled

--onceperdatabase,insteadofonceperuserthatwantedtouseit

authidcurrent_user

as

l_free_blksnumber;

l_total_blocksnumber;

l_total_bytesnumber;

l_unused_blocksnumber;

l_unused_bytesnumber;

l_LastUsedExtFileIdnumber;

l_LastUsedExtBlockIdnumber;

l_LAST_USED_BLOCKnumber;

l_segment_space_mgmtvarchar2(255);

l_unformatted_blocksnumber;

l_unformatted_bytesnumber;

l_fs1_blocksnumber;l_fs1_bytesnumber;

l_fs2_blocksnumber;l_fs2_bytesnumber;

l_fs3_blocksnumber;l_fs3_bytesnumber;

l_fs4_blocksnumber;l_fs4_bytesnumber;

l_full_blocksnumber;l_full_bytesnumber;

--inlineproceduretoprintoutnumbersnicelyformatted

--withasimplelabel

procedurep(p_labelinvarchar2,p_numinnumber)

is

begin

dbms_output.put_line(rpad(p_label,40,'.')||

to_char(p_num,'999,999,999,999'));

end;

begin

--thisqueryisexecuteddynamicallyinordertoallowthisprocedure

--tobecreatedbyauserwhohasaccesstoDBA_SEGMENTS/TABLESPACES

--viaaroleasiscustomary.

--NOTE:atruntime,theinvokerMUSThaveaccesstothesetwo

--views!

--thisquerydeterminesiftheobjectisaASSMobjectornot

begin

executeimmediate

'selectts.segment_space_management

fromdba_segmentsseg,dba_tablespacests

whereseg.segment_name=:p_segname

and(:p_partitionisnullor

seg.partition_name=:p_partition)

andseg.owner=:p_owner

andseg.segment_type=:p_type

andseg.tablespace_name=ts.tablespace_name'

intol_segment_space_mgmt

usingp_segname,p_partition,p_partition,p_owner,p_type;

exception

whentoo_many_rowsthen

dbms_output.put_line

('Thismustbeapartitionedtable,usep_partition=>');

return;

end;

--iftheobjectisinanASSMtablespace,wemustusethisAPI

--calltogetspaceinformation,elseweusetheFREE_BLOCKS

--APIfortheusermanagedsegments

ifl_segment_space_mgmt='AUTO'

then

dbms_space.space_usage

(p_owner,p_segname,p_type,l_unformatted_blocks,

l_unformatted_bytes,l_fs1_blocks,l_fs1_bytes,

l_fs2_blocks,l_fs2_bytes,l_fs3_blocks,l_fs3_bytes,

l_fs4_blocks,l_fs4_bytes,l_full_blocks,l_full_bytes,p_partition);

p('UnformattedBlocks',l_unformatted_blocks);

p('FS1Blocks(0-25)',l_fs1_blocks);

p('FS2Blocks(25-50)',l_fs2_blocks);

p('FS3Blocks(50-75)',l_fs3_blocks);

p('FS4Blocks(75-100)',l_fs4_blocks);

p('FullBlocks',l_full_blocks);

else

dbms_space.free_blocks(

segment_owner=>p_owner,

segment_name=>p_segname,

segment_type=>p_type,

freelist_group_id=>0,

free_blks=>l_free_blks);

p('FreeBlocks',l_free_blks);

endif;

--andthentheunusedspaceAPIcalltogettherestofthe

--information

dbms_space.unused_space

(segment_owner=>p_owner,

segment_name=>p_segname,

segment_type=>p_type,

partition_name=>p_partition,

total_blocks=>l_total_blocks,

total_bytes=>l_total_bytes,

unused_blocks=>l_unused_blocks,

unused_bytes=>l_unused_bytes,

LAST_USED_EXTENT_FILE_ID=>l_LastUsedExtFileId,

LAST_USED_EXTENT_BLOCK_ID=>l_LastUsedExtBlockId,

LAST_USED_BLOCK=>l_LAST_USED_BLOCK);

p('TotalBlocks',l_total_blocks);

p('TotalBytes',l_total_bytes);

p('TotalMBytes',trunc(l_total_bytes/1024/1024));

p('UnusedBlocks',l_unused_blocks);

p('UnusedBytes',l_unused_bytes);

p('LastUsedExtFileId',l_LastUsedExtFileId);

p('LastUsedExtBlockId',l_LastUsedExtBlockId);

p('LastUsedBlock',l_LAST_USED_BLOCK);

end;

/

运行结果如下:

SQL>setserveroutputon

SQL>execshow_space('TOBJ')

UnformattedBlocks.....................	0

FS1Blocks(0-25)......................	0

FS2Blocks(25-50).....................	0

FS3Blocks(50-75).....................	0

FS4Blocks(75-100).....................	0

FullBlocks............................	196

TotalBlocks............................	256

TotalBytes.............................2,097,152

TotalMBytes............................	2

UnusedBlocks...........................	48

UnusedBytes............................	393,216

LastUsedExtFileId....................	4

LastUsedExtBlockId...................	57,856

LastUsedBlock.........................	80

PL/SQLproceduresuccessfullycompleted.

unformattedblocks:为表分配位于高水位线之下的但未用的块数.把未格式化和未用的块加在一起,就是已为表分配但是从未保存的assm对象数据块的总块数.

FS1-FS4:包含数据的格式化块.项名后面的数字区间表示各块的空闲度,0-25表示空闲度为0-25%的块数

Fullblocks:已满的块数,不能再对这些块执行插入.

Totalblocks,bytes:为段分配的总共块数和字节数

Unusedblocks,bytes:表示未用的空间所占的比例.这些块已经分配给所查看的段,但是目前在段的高水位之上

LastUsedExtFileid:包含最后一个区块的文件的文件ID

LastUsedExtBlockId:最后一个区段开始处的块ID,这是最后使用的文件中的块ID

LastUsedBlocks:最后一个区段中最后一个块的偏移量