Oracle索引质量分析(二)
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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;
4、相关参考