这句为什么执行特别慢
SQL> select sum ( charges ) from inp_bill_detail where performed_by ='34' and rcpt_no >= '90031714' and rcpt_no <= '90032590' and item_class ='A' and ordered_by ='21' ;

Elapsed: 00:00:24.38

Execution Plan
----------------------  
Plan hash value: 4038433501  
   
--------------------------------------------------  
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |  
--------------------------------------------------  
| 0 | SELECT STATEMENT | | 1 | 33 | 49972 (3)| 00:10:00 |  
| 1 | SORT AGGREGATE | | 1 | 33 | | |  
|* 2 | TABLE ACCESS FULL| INP_BILL_DETAIL | 1 | 33 | 49972 (3)| 00:10:00 |  
--------------------------------------------------  
   
Predicate Information (identified by operation id):  
---------------------------------------------------  
   
  2 - filter("PERFORMED_BY"='34' AND "ITEM_CLASS"='A' AND "ORDERED_BY"='21'  
  AND "RCPT_NO">='90031714' AND "RCPT_NO"<='90032590')  
   
Note  
-----  
  - dynamic sampling used for this statement  


Statistics
----------------------  
  0 recursive calls  
  0 db block gets  
  219060 consistent gets  
  208771 physical reads  
  0 redo size  
  417 bytes sent via SQL*Net to client  
  396 bytes received via SQL*Net from client  
  2 SQL*Net roundtrips to/from client  
  0 sorts (memory)  
  0 sorts (disk)  
  1 rows processed

------解决方案--------------------
1.重新收集一下该表（inp_bill_detail ）的统计信息：

analyze table inp_bill_detail compute statistics;