分析索引质量脚本

--script name: idx_quality.sql     --Author : Leshami  --Blog: http://blog.csdn.net/leshami   
--index quality retrieval  
SET LINESIZE 145  
SET PAGESIZE 1000  
SET VERIFY OFF  
  
CLEAR COMPUTES  
CLEAR BREAKS  
  
BREAK ON table_name ON num_rows ON blocks  
  
COLUMN owner FORMAT a14 HEADING ‘Index owner‘  
COLUMN table_name FORMAT a25 HEADING ‘Table‘  
COLUMN index_name FORMAT a25 HEADING ‘Index‘  
COLUMN num_rows FORMAT 999G999G990 HEADING ‘Table|Rows‘  
COLUMN MB FORMAT 9G990 HEADING ‘Index|Size MB‘  
COLUMN blocks HEADING ‘Table|Blocks‘  
COLUMN num_blocks FORMAT 9G990 HEADING ‘Data|Blocks‘  
COLUMN avg_data_blocks_per_key FORMAT 999G990 HEADING ‘Data Blks|per Key‘  
COLUMN avg_leaf_blocks_per_key FORMAT 999G990 HEADING ‘Leaf Blks|per Key‘  
COLUMN clustering_factor FORMAT 999G999G990 HEADING ‘Clust|Factor‘  
COLUMN Index_Quality FORMAT A13 HEADING ‘Index|Quality‘  
  
--SPOOL index_quality  
  
  SELECT i.table_name,  
         t.num_rows,  
         t.blocks,  
         i.index_name,  
         o.bytes / 1048576 mb,  
         i.avg_data_blocks_per_key,  
         i.avg_leaf_blocks_per_key,  
         i.clustering_factor,  
         CASE  
            WHEN NVL (i.clustering_factor, 0) = 0 THEN ‘0-No Stats‘  
            WHEN NVL (t.num_rows, 0) = 0 THEN ‘0-No Stats‘  
            WHEN (ROUND (i.clustering_factor / t.num_rows * 100)) < 6 THEN ‘5-Excellent‘  
            WHEN (ROUND (i.clustering_factor / t.num_rows * 100)) BETWEEN 7 AND 11 THEN ‘4-Very Good‘  
            WHEN (ROUND (i.clustering_factor / t.num_rows * 100)) BETWEEN 12 AND 15 THEN ‘2-Good‘  
            WHEN (ROUND (i.clustering_factor / t.num_rows * 100)) BETWEEN 16 AND 25 THEN ‘2-Fair‘  
            ELSE ‘1-Poor‘  
         END  
            index_quality  
    FROM dba_indexes i, dba_segments o, dba_tables t  
   WHERE   
     --    i.index_name LIKE UPPER (‘%&&1%‘) AND  
         i.owner = t.owner  
         AND i.table_name = t.table_name  
         AND i.owner = o.owner  
         AND i.index_name = o.segment_name  
         AND t.owner = UPPER(‘&input_owner‘)  
         AND t.table_name LIKE UPPER(‘%&input_tbname%‘)  
ORDER BY table_name,  
         num_rows,  
         blocks,  
         index_quality DESC;  
  
--SPOOL OFF;  
  
===========================================================================================  
--script name: idx_info.sql   
--get the index column information by specified table  
set linesize 180  
col cl_nam format a20  
col table_name format a25  
col cl_pos format 9  
col idx_typ format a15  
SELECT b.table_name,  
           a.index_name,  
           a.column_name     cl_nam,  
           a.column_position cl_pos,  
           b.status,  
           b.index_type      idx_typ,  
           a.descend         dscd  
FROM   dba_ind_columns a, dba_indexes b  
WHERE  a.index_name = b.index_name  
           AND owner = upper(‘&owner‘)  
           AND a.table_name LIKE upper(‘%&table_name%‘)  
ORDER  BY 2, 4;