Query Optimization for Oracle从多个视图中选择单行

Question

我有多个表ACCOUNT_ID的键，我建立了多个视图来为每个CUSTOMER计算各种值。

现在，我试图遍历这种关系：

编辑：给定一个svc_mrt_id，可以在CUS_SERVICE中标识account_id，然后使用account_id，可以检索各种统计信息。

我试过这个查询

SELECT * FROM (
    SELECT * 
    FROM CUS_SERVICE s 
    LEFT JOIN CUSTOMER c ON s.account_id = c.account_id
    LEFT JOIN V_STCLOSE_5_CURRENT_BALANCE cb ON cb.stat_account_id = s.account_id
    LEFT JOIN V_STATUS_ALL sa ON sa.account_id = s.account_id
    LEFT JOIN V_NEXT_POOL_DATE pd ON pd.pool_donor = s.account_id
) WHERE svc_mrt_id = ?;


Query plan:
SELECT (245709)
    HASH JOIN (245078)
        HASH JOIN (628)
            NESTED LOOPS
                TABLE CUS_SERVICE (1)
                VIEW V_STATUS_ALL (626)
            VIEW V_STATUS_ALL (626)
/* This one is the culprit, should be (4317) if pushed predicates */
        VIEW V_STCLOSE_5_CURRENT_BALANCE (245078)
            HASH JOIN(232729)
                MAT_VIEW ACCESS(4)
                VIEW (232670)
/* Not pushing this predicate further is completely wrong */
/* Filtering here will generate large intermediate result set for only one row*/
/* Should be pushed to base table to generate only that one row required */
                    FILTER PREDICATES t1.ACCOUNT_ID = s.ACCOUNT_ID

现在，当两个视图与表CUS_SERVICE结合在一起时，谓词现在仅被推送到V_STATUS_ALL，而不被推送到V_STCLOSE_5_CURRENT_BALANCE

有谁知道是否有可能解决此问题，或者有其他替代方法吗？

更多信息：

编辑：2013/12/26 19:13 GMT + 8经过一些进一步的测试，我隔离了两个不兼容的视图。 结果如下：

SELECT * FROM (
    SELECT sa.account_id
    FROM V_STCLOSE_5_CURRENT_BALANCE cb
    LEFT JOIN V_STATUS_ALL sa ON sa.account_id = cb.stat_account_id
) WHERE account_id = ?;
/* COST = 4323 */

SELECT * FROM (
    SELECT s.svc_mrt_id
    FROM CUS_SERVICE s 
    LEFT JOIN V_STCLOSE_5_CURRENT_BALANCE cb ON cb.stat_account_id = s.account_id
) WHERE svc_mrt_id = ?;
/* COST = 4322, looks right */

SELECT * FROM (
    SELECT s.svc_mrt_id
    FROM CUS_SERVICE s
    LEFT JOIN V_STATUS_ALL sa ON sa.account_id = s.account_id
) WHERE svc_mrt_id = ?;
/* COST ~ 2045 */

SELECT * FROM (
    SELECT s.svc_mrt_id
    FROM CUS_SERVICE s
    LEFT JOIN V_STCLOSE_5_CURRENT_BALANCE cb ON cb.stat_account_id = s.account_id
    LEFT JOIN V_STATUS_ALL sa ON sa.account_id = s.account_id
) WHERE svc_mrt_id = ?;
/* cost ~ 232729, something strange happened about this 3-Table join combination */

对于视图查询：

/*IV_STCLOSE_1_1_T*/
/*IV_STCLOSE_1_2_T*/
/*IV_STCLOSE_2_1_T*/
/*These are materialized view for the bill day related logic,
basically calculate the open and close dates for each customer each month,
and is only refreshed once per day*/


/*IV_STCLOSE_2_2_T*/
/*This filter some unnecessary, outdated transaction records*/
/*As each customer may have only 20/3M transaction records required for calculation,
the query must push select of account_id up to here to be most selective*/
SELECT ACCOUNT_ID, POINT_DATE, POINT
FROM history_point 
WHERE point_date >= ( 
    SELECT MIN(open_date) 
    FROM IV_STCLOSE_2_1_t
)

/*IV_STCLOSE_3_T*/
/*This sum points within each month*/
SELECT p0.account_id, p0.open_date, p0.close_date,
COALESCE(SUM(DECODE(SIGN(p.point),-1,p.point)),0) AS point_used,
COALESCE(SUM(DECODE(SIGN(p.point),1,p.point)),0) AS point_earned 
FROM iv_stclose_2_1_t p0 
LEFT JOIN iv_stclose_2_2_t p
ON p.account_id = p0.account_id 
AND p.point_date >=  p0.open_date 
AND p.point_date < p0.close_date + INTERVAL '1' DAY
GROUP BY p0.account_id, p0.open_date, p0.close_date


/*IV_STCLOSE_4_T*/
/*This sums each month's point earned and used for the open and close balance*/
SELECT v.account_id AS STAT_ACCOUNT_ID, v.open_date, v.close_date, 
v.close_balance + t1.open_balance AS open_balance,
t1.point_earned AS point_earn, t1.point_used,
v.close_balance + t1.open_balance + t1.point_earned + t1.point_used AS close_balance
FROM IV_STCLOSE_2_1_T v
LEFT JOIN (
    SELECT v1.account_id, v1.open_date, v1.point_earned, v1.point_used,
    COALESCE(sum(v2.point_used + v2.point_earned),0) AS OPEN_BALANCE
    FROM IV_STCLOSE_3_T v1 
    LEFT JOIN IV_STCLOSE_3_T v2 
    ON v1.account_id = v2.account_id 
    AND v1.OPEN_DATE > v2.OPEN_DATE
    GROUP BY v1.account_id, v1.open_date, v1.point_earned, v1.point_used
) t1
ON v.account_id = t1.account_id 
AND v.OPEN_DATE = t1.OPEN_DATE


/*V_STCLOSE_5_CURRENT_BALANCE*/
/*This select the most recent balance*/
SELECT v.STAT_ACCOUNT_ID,v.OPEN_DATE,v.CLOSE_DATE,
v.OPEN_BALANCE,v.POINT_EARN,v.POINT_USED,v.CLOSE_BALANCE 
FROM IV_STCLOSE_4_T v 
WHERE MONTHS_BETWEEN(TRUNC(SYSDATE), v.OPEN_DATE) < 1

Answer 1

尝试添加索引提示，以便优化器将使用该特定索引。 您也可以尝试按连接表的顺序列出表，然后添加/ * +有序* /提示。