慎用位图索引

/* Formatted on 2014/03/18 09:48 (Formatter Plus v4.8.8) */
SELECT   c.fee_type_desc, i.order_code, b.chn_name AS rexp_code_name,
         i.rexp_code,
         (CASE (SUBSTR ((f.order_name || '/' || f.SPECIFICATION),
                        LENGTH (f.order_name || '/' || f.SPECIFICATION),
                        LENGTH (f.order_name || '/' || f.SPECIFICATION)
                       )
               )
             WHEN '/'
                THEN SUBSTR ((f.order_name || '/' || f.SPECIFICATION),
                             0,
                               LENGTH ((f.order_name || '/' || f.SPECIFICATION
                                       )
                                      )
                             - 1
                            )
             ELSE (f.order_name || '/' || f.SPECIFICATION)
          END
         ) AS order_name,
         SUM (i.dosage_qty) AS dosage_qty, f.unit_code AS dosage_unit,
         i.own_price, SUM (i.tot_amt) AS tot_amt
    FROM icsi_ordd i, base_fee f, base_dictionary b, ins_fee_type c
   WHERE i.bill_no IN ('201401241636045510')
     AND i.hosp_area = '001'
     AND i.hosp_area = f.hosp_area
     AND i.order_code = f.order_code
     AND b.GROUP_ID = 'SYS_CHARGE'
     AND b.ID = i.rexp_code
     AND (i.setmain_flg = 'N' OR i.setmain_flg IS NULL)
     AND i.tot_amt <> 0
     AND f.inspay_type = c.fee_type_code(+)
     AND c.starline_flg(+) = 'N'
     AND c.plan_flg(+) = 'N'
     AND c.item_flg(+) = 'Y'
GROUP BY i.rexp_code,
         b.chn_name,
         i.order_code,
         c.fee_type_desc,
         (CASE (SUBSTR ((f.order_name || '/' || f.SPECIFICATION),
                        LENGTH (f.order_name || '/' || f.SPECIFICATION),
                        LENGTH (f.order_name || '/' || f.SPECIFICATION)
                       )
               )
             WHEN '/'
                THEN SUBSTR ((f.order_name || '/' || f.SPECIFICATION),
                             0,
                               LENGTH ((f.order_name || '/' || f.SPECIFICATION
                                       )
                                      )
                             - 1
                            )
             ELSE (f.order_name || '/' || f.SPECIFICATION)
          END
         ),
         f.unit_code,
         i.own_price
ORDER BY i.rexp_code, i.order_code
-----------------------------------------------------------------------------------------------
| Id  | Operation                        | Name               | Rows  | Bytes | Cost (%CPU)| Ti
-----------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT                 |                    |     1 |   137 |  1244   (1)| 00
|   1 |  SORT GROUP BY                   |                    |     1 |   137 |  1244   (1)| 00
|   2 |   NESTED LOOPS OUTER             |                    |     1 |   137 |  1243   (0)| 00
|   3 |    NESTED LOOPS                  |                    |     1 |   118 |  1242   (0)| 00
|   4 |     NESTED LOOPS                 |                    |     1 |    77 |  1241   (0)| 00
|   5 |      TABLE ACCESS BY INDEX ROWID | BASE_DICTIONARY    |     6 |   168 |     4   (0)| 00
|*  6 |       INDEX RANGE SCAN           | PK_BASE_DICTIONARY |     6 |       |     2   (0)| 00
|*  7 |      TABLE ACCESS BY INDEX ROWID | ICSI_ORDD          |     1 |    49 |  1241   (0)| 00
|   8 |       BITMAP CONVERSION TO ROWIDS|                    |       |       |            |
|*  9 |        BITMAP INDEX SINGLE VALUE | REXP_CODE          |       |       |            |
|  10 |     TABLE ACCESS BY INDEX ROWID  | BASE_FEE           |     1 |    41 |     1   (0)| 00
|* 11 |      INDEX UNIQUE SCAN           | BASE_FEE_PK        |     1 |       |     0   (0)| 00
|* 12 |    TABLE ACCESS BY INDEX ROWID   | INS_FEE_TYPE       |     1 |    19 |     1   (0)| 00
|* 13 |     INDEX UNIQUE SCAN            | PK_INS_FEE_TYPE    |     1 |       |     0   (0)| 00
-----------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   6 - access("B"."GROUP_ID"='SYS_CHARGE')
   7 - filter("I"."BILL_NO"='201401241636045510' AND "I"."TOT_AMT"<>0 AND
              ("I"."SETMAIN_FLG"='N' OR "I"."SETMAIN_FLG" IS NULL) AND "I"."HOSP_AREA"='001')
   9 - access("B"."ID"="I"."REXP_CODE")
  11 - access("F"."HOSP_AREA"='001' AND "I"."ORDER_CODE"="F"."ORDER_CODE")
  12 - filter("C"."ITEM_FLG"(+)='Y' AND "C"."PLAN_FLG"(+)='N' AND "C"."STARLINE_FLG"(+)='N')
  13 - access("F"."INSPAY_TYPE"="C"."FEE_TYPE_CODE"(+))

BITMAP
CREATE BITMAP INDEX BJCY.REXP_CODE ON BJCY.ICSI_ORDD

REXP_CODE是个注记 就是不同的状态代码 123  所以肯定有大量重复

干掉BITMAP 索引,创建组合索引

------------------------------------------------------------------------------------------------------
| Id  | Operation                       | Name               | Rows  | Bytes | Cost (%CPU)| Time     |
------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT                |                    |     1 |   137 |    45   (3)| 00:00:01 |
|   1 |  SORT GROUP BY                  |                    |     1 |   137 |    45   (3)| 00:00:01 |
|   2 |   NESTED LOOPS OUTER            |                    |     1 |   137 |    44   (0)| 00:00:01 |
|   3 |    NESTED LOOPS                 |                    |     1 |   118 |    43   (0)| 00:00:01 |
|   4 |     NESTED LOOPS                |                    |     1 |    77 |    42   (0)| 00:00:01 |
|   5 |      TABLE ACCESS BY INDEX ROWID| BASE_DICTIONARY    |     6 |   168 |     4   (0)| 00:00:01 |
|*  6 |       INDEX RANGE SCAN          | PK_BASE_DICTIONARY |     6 |       |     2   (0)| 00:00:01 |
|*  7 |      TABLE ACCESS BY INDEX ROWID| ICSI_ORDD          |     1 |    49 |    18   (0)| 00:00:01 |
|*  8 |       INDEX RANGE SCAN          | REXP_CODE2         |    19 |       |     4   (0)| 00:00:01 |
|   9 |     TABLE ACCESS BY INDEX ROWID | BASE_FEE           |     1 |    41 |     1   (0)| 00:00:01 |
|* 10 |      INDEX UNIQUE SCAN          | BASE_FEE_PK        |     1 |       |     0   (0)| 00:00:01 |
|* 11 |    TABLE ACCESS BY INDEX ROWID  | INS_FEE_TYPE       |     1 |    19 |     1   (0)| 00:00:01 |
|* 12 |     INDEX UNIQUE SCAN           | PK_INS_FEE_TYPE    |     1 |       |     0   (0)| 00:00:01 |
------------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   6 - access("B"."GROUP_ID"='SYS_CHARGE')
   7 - filter("I"."TOT_AMT"<>0 AND ("I"."SETMAIN_FLG"='N' OR "I"."SETMAIN_FLG" IS NULL))
   8 - access("I"."BILL_NO"='201401241636045510' AND "I"."HOSP_AREA"='001' AND
              "B"."ID"="I"."REXP_CODE")
       filter("I"."HOSP_AREA"='001' AND "B"."ID"="I"."REXP_CODE")
  10 - access("F"."HOSP_AREA"='001' AND "I"."ORDER_CODE"="F"."ORDER_CODE")
  11 - filter("C"."ITEM_FLG"(+)='Y' AND "C"."PLAN_FLG"(+)='N' AND "C"."STARLINE_FLG"(+)='N')
  12 - access("F"."INSPAY_TYPE"="C"."FEE_TYPE_CODE"(+))
这回走索引了