Oracle查看对象空间使用情况show_space

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本文介绍了一个由Tom大神撰写的Oracle数据库工具，用于查看特定对象的空间使用情况，包括总块数、总字节数、未使用的块数、最后使用的扩展文件ID等信息。通过演示代码及实例，展示了如何利用该工具获取数据库对象的空间利用率。

tom大神写了一个用于查看Oracle数据库对象空间使用情况。
下面演示一下如何使用：

–工具源码

CREATE OR REPLACE PROCEDURE show_space(p_segname   IN VARCHAR2,
                                       p_owner     IN VARCHAR2 DEFAULT USER,
                                       p_type      IN VARCHAR2 DEFAULT 'TABLE',
                                       p_partition IN VARCHAR2 DEFAULT NULL) AS
  l_free_blks          NUMBER;
  l_total_blocks       NUMBER;
  l_total_bytes        NUMBER;
  l_unused_blocks      NUMBER;
  l_unused_bytes       NUMBER;
  l_lastusedextfileid  NUMBER;
  l_lastusedextblockid NUMBER;
  l_last_used_block    NUMBER;
  l_segment_space_mgmt VARCHAR2(255);
  l_unformatted_blocks NUMBER;
  l_unformatted_bytes  NUMBER;
  l_fs1_blocks         NUMBER;
  l_fs1_bytes          NUMBER;
  l_fs2_blocks         NUMBER;
  l_fs2_bytes          NUMBER;
  l_fs3_blocks         NUMBER;
  l_fs3_bytes          NUMBER;
  l_fs4_blocks         NUMBER;
  l_fs4_bytes          NUMBER;
  l_full_blocks        NUMBER;
  l_full_bytes         NUMBER;

  PROCEDURE p(p_label IN VARCHAR2,
              p_num   IN NUMBER) IS
  BEGIN
    dbms_output.put_line(rpad(p_label, 40, '.') ||
                         to_char(p_num, '999,999,999,999'));
  END;
BEGIN
  EXECUTE IMMEDIATE 'select ts.segment_space_management from dba_segments seg,dba_tablespaces ts where seg.segment_name = :p_segname and (:p_partition is null or seg.partition_name = :p_partition) and seg.owner = :p_owner and seg.tablespace_name=ts.tablespace_name'
    INTO l_segment_space_mgmt
    USING p_segname, p_partition, p_partition, p_owner;

  --     exception
  --             when too_many_rows
  --             then
  --             dbms_output.put_line('This must be a partitioned table,use p_partition => ');
  --             return;
  --     end;

  IF l_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('Unformatted Blocks  ', l_unformatted_blocks);
    p('FS1 Blocks (0-25)   ', l_fs1_blocks);
    p('FS2 Blocks (25-50)  ', l_fs2_blocks);
    p('FS3 Blocks (50-75)  ', l_fs3_blocks);
    p('FS4 Blocks (75-100) ', l_fs4_blocks);
    p('Full Blocks         ', 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);
  END IF;

  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('Total Blocks ', l_total_blocks);
  p('Total Bytes  ', l_total_bytes);    
  p('Total MBytes ', trunc(l_total_bytes / 1024 / 1024));
  p('Unused Blocks', l_unused_blocks);
  p('Unused Bytes ', l_unused_bytes);
  p('Last Used Ext FileId', l_lastusedextfileid);
  p('Last Used Ext BlockId', l_lastusedextblockid);
  p('Last Used Block', l_last_used_block);
END;

–用法演示

create table test_space
AS
select * from dba_tables;
/

SYS@orcl> exec show_space('TEST_SPACE');

Total Blocks ……………………… 112
Total Bytes ……………………… 917,504
Total MBytes ……………………… 0
Unused Blocks……………………… 3
Unused Bytes ……………………… 24,576
Last Used Ext FileId……………….. 1
Last Used Ext BlockId………………. 115,608
Last Used Block……………………. 5

PL/SQL 过程已成功完成。

SYS@orcl> delete from test_space;

已删除3044行。

SYS@orcl> commit;

提交完成。

SYS@orcl> exec show_space('TEST_SPACE');

PL/SQL 过程已成功完成。

SYS@orcl> truncate table test_space;

表被截断。

SYS@orcl> exec show_space(‘TEST_SPACE’);
Total Blocks ……………………… 8
Total Bytes ……………………… 65,536
Total MBytes ……………………… 0
Unused Blocks……………………… 7
Unused Bytes ……………………… 57,344
Last Used Ext FileId……………….. 1
Last Used Ext BlockId………………. 101,872
Last Used Block……………………. 1

PL/SQL 过程已成功完成。