oracle查询对象（表、索引）空间信息

对象的空间分配与空间利用情况，除了从各个方面的分析，如分析表，查询rowid等方法外，其实oracle提供了一个查询空间的包dbms_space，如果我们稍封装一下，将是非常好用的一个东西。

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)-- This procedure uses AUTHID CURRENT USER so it can query DBA_*   -- views using privileges from a ROLE and so it can be installed   -- once per database, instead of once per user who wanted to use it. AUTHID CURRENT_USER 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;  -- Inline procedure to print out numbers nicely formatted   -- with a simple label.   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  -- This query is executed dynamically in order to allow this procedure   -- to be created by a user who has access to DBA_SEGMENTS/TABLESPACES   -- via a role as is customary.   -- NOTE: at runtime, the invoker MUST have access to these two   -- views!   -- This query determines if the object is an ASSM object or not.   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 the object is in an ASSM tablespace, we must use this API   -- call to get space information; else we use the FREE_BLOCKS   -- API for the user managed segments.   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);      p('Free Blocks', l_free_blks);  END IF;  -- And then the unused space API call to get the rest of the   -- 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('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;

执行结果将如下所示：

SQL> exec show_space2('test_stevie');Free Blocks.............................               3Total Blocks............................              32Total Bytes.............................         262,144Total MBytes............................               0Unused Blocks...........................               0Unused Bytes............................               0Last Used Ext FileId....................              27Last Used Ext BlockId...................          41,617Last Used Block.........................               8PL/SQL procedure successfully completed