我的桌子有100万条记录。我想从表中只获取非活动用户。查询执行需要10分钟以上。即使我是 使用索引。 STATUS只有两个值Y或N.所以我创建了该列的位图索引。
EXPLAIN PLAN FOR
SELECT CUSTOMER NAME,MOBILE NUMBER,ACCOUNT NUMBER,CUSTOMER ID,REGISTARTION DATE from REGISTRATION where STATUS='N';
Plan hash value: 2615581521
---------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop |
---------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 960K| 66M| 9880 (1)| 00:01:59 | | |
| 1 | PARTITION RANGE ALL | | 960K| 66M| 9880 (1)| 00:01:59 | 1 |1048575|
| 2 | PARTITION HASH ALL | | 960K| 66M| 9880 (1)| 00:01:59 | 1 | 4 |
| 3 | TABLE ACCESS BY LOCAL INDEX ROWID| REGISTRATION | 960K| 66M| 9880 (1)| 00:01:59 | 1 |1048575|
| 4 | BITMAP CONVERSION TO ROWIDS | | | | | | | |
|* 5 | BITMAP INDEX SINGLE VALUE | IDX_REGISTRATION_7 | | | | | 1 |1048575|
---------------------------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
5 - access("STATUS"='N')
Note
-----
- dynamic sampling used for this statement (level=11)
-----------------------------------------------------------------------------------------------------------------------------------------------------
如何提高上述查询的性能？