函数使得索引列失效 - 数据库编程

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3 PK_ACC_POS_INT_TBL 155658 33777720 33777720 1 1 33777447 27-SEP-11
3 ACC_POS_INT_10DIG_IDX 160247 32850596 32850596 1 1 32763921 27-SEP-11
3.尝试在BUSINESS_DATE列上创建索引

SQL> create index I_ACC_POS_INT_TBL_BS_DT on ACC_POS_INT_TBL(BUSINESS_DATE) tablespace tbs_tmp nologging;

Index created.

SQL> @Idx_Stat
Enter value for input_table_name: ACC_POS_INT_TBL
old 11: WHERE table_name = upper('&input_table_name')
new 11: WHERE table_name = upper('ACC_POS_INT_TBL')
Enter value for input_owner: goex_admin
old 12: AND owner = upper('&input_owner')
new 12: AND owner = upper('goex_admin')

BLEV IDX_NAME LF_BLKS DST_KEYS NUM_ROWS LF_PER_KEY DAT_BLK_PER_KEY CLUS_FCT LST_ANLY
---- ------------------------------ ---------- ---------- ---------- ---------- --------------- ---------- ---------
2 I_ACC_POS_INT_TBL_BS_DT 93761 908 33659855 103 506 460007 30-SEP-11
3 PK_ACC_POS_INT_TBL 155658 33777720 33777720 1 1 33777447 27-SEP-11
3 ACC_POS_INT_10DIG_IDX 160247 32850596 32850596 1 1 32763921 27-SEP-11
建立索引后聚簇因子较小，差不多接近表上块的数量

4.使用新创建索引后的执行计划

Execution Plan
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Plan hash value: 2183566226

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| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
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函数使得索引列失效(六)