选择与表值函数连接中的 Oracle 标量函数

Question

我有一个执行不佳的查询。查询的一个方面是在表值函数上使用交叉联接，老实说，我是在模仿我在函数上使用 CROSS APPLY 以避免使用标量函数调用的 TSQL 行为。这是 Oracle 中的不良行为吗？

我遇到的主要问题是 Oracle Tuning Advisor 不会解析我的查询，因此我还无法研究索引优化。通常我不会发布这么多代码，但我怀疑可能导致问题的是我的查询而不是表优化。

statistics se表确实是唯一一个拥有超过4,000,000条记录的表。任何人都可以建议删除公然不良的 Oracle 行为吗？或者，如果一切看起来都很好，那么它是获得一些索引调整建议的好工具吗？ Oracle Enterprise Manager 不会解析此查询以提供任何建议。

从跟踪中捕获并格式化的附加性能信息 通过 TKPROF

Parse: Count(1) | CPU(0.04) | Elapsed(0.04) | Disk(0) | Query(852) | Current(0) | Rows(0)

Execute: Count(1) | CPU(0.00) | Elapsed(0.00) | Disk(0) | Query(0) | Current(0) | Rows(0)

Fetch: Count(1) | CPU(9.64) | Elapsed(14.50) | Disk(34578) | Query(35610) | Current(4) | Rows(4)

Misses in library cache during parse: 1 Optimizer mode: ALL_ROWS Parsing user id: 1165

Rows Row Source Operation

---

  4  HASH JOIN OUTER (cr=38069 pr=34578 pw=0 time=19208475 us)
  2   COLLECTION ITERATOR PICKLER FETCH REPORT_INTERVAL_SEQUENCE_UDF (cr=97 pr=0 >                                                                    pw=0 time=13766 us)
  4   VIEW  (cr=37972 pr=34578 pw=0 time=19194353 us)
  4    HASH GROUP BY (cr=37972 pr=34578 pw=0 time=19194329 us)  

60650 FILTER (cr=37972 pr=34578 pw=0 time=19673947 us)
60650 NESTED LOOPS (cr=37972 pr=34578 pw=0 time=19431329 us)
60650 HASH JOIN (cr=37941 pr=34578 pw=0 time=5294908 us) 4 COLLECTION ITERATOR PICKLER FETCH REPORT_MACHINEINFO_GETT_UDF (cr=2331 pr=0 pw=0 time=212033 us)
60650 TABLE ACCESS FULL ELS_STATISTIC_ENTRY (cr=35610 pr=34578 pw=0 time=4416705 us)
60650 COLLECTION ITERATOR PICKLER FETCH REPORT_INTERVAL_GETT_UDF (cr=31 pr=0 > pw=0 time=13372794 us)

SELECT
         TimeInterval,
         stats.During,
         stats.Name,
         stats.cnt
    FROM
        TABLE (GET_INTERVAL_SEQUENCE_UDF(
                                         TO_TIMESTAMP ('07/15/2011','mm/dd/yyyy')
                                        ,TO_TIMESTAMP ('07/20/2011','mm/dd/yyyy')
                                        ,2)) dtRange
    LEFT JOIN
    (
         SELECT
              i.During
              , mi.Name
              , SUM (CAST (VALUE_NUMERIC AS INT)) cnt

         FROM
              statistics se
         JOIN TABLE (Get_Context_Info_udf ()) mi 
              ON (se.Context_ID = mi.Context_ID)
         CROSS JOIN TABLE (Interval_GetT (se.EntryDate, 2)) i
         WHERE
              StatisticTypeID = HEXTORAW ('6CF933B091AE46FEA7F56BE96308190F') 
              AND EntryDate < TO_TIMESTAMP ('07/20/2011','mm/dd/yyyy') 
              AND EntryDate > TO_TIMESTAMP ('07/15/2011', 'mm/dd/yyyy')
         GROUP BY
             i.During
             , mi.Name
    ) stats ON dtRange.TimeInterval = stats.TimeInterval


The following are for reference in the aforementioned query.


CREATE OR REPLACE FUNCTION Interval_GetT(datestamp IN timestamp,  timeInterval IN int) 
RETURN TReportIntervalList AS vResult TReportIntervalList;
BEGIN
     SELECT TReportInterval(
                            CASE timeInterval 
                            WHEN 1 THEN TO_CHAR(datestamp, 'YYYY-MM-DD HH24') 
                            WHEN 2 THEN TO_CHAR(datestamp, 'YYYY-MM-DD')
                            WHEN 3 THEN TO_CHAR(datestamp, 'YYYY-WW')
                            END
                           ) 
     BULK COLLECT INTO vResult                                       
     FROM Dual WHERE ROWNUM = 1;

     RETURN vResult;
END;



CREATE OR REPLACE FUNCTION GET_INTERVAL_SEQUENCE_UDF(
      startTime IN timestamp,
      endTime IN timestamp,
      inputInterval IN int)
      RETURN t_interval_list_table   AS  intervalList t_interval_list_table := t_interval_list_table();
    BEGIN

    SELECT 
         CASE inputInterval
         WHEN 1 THEN (t_interval(REPORT_Interval_Get_udf((startTime + ((ROWNUM-1) * 1/24)), inputInterval))) --Hour
         WHEN 2 THEN (t_interval(REPORT_Interval_Get_udf((startTime + (ROWNUM-1)), inputInterval))) --Day
         WHEN 3 THEN (t_interval(REPORT_Interval_Get_udf((startTime + ((ROWNUM-1)*7)), inputInterval))) --Week
            END 
          BULK COLLECT INTO intervalList
          FROM dual CONNECT BY LEVEL <= (CASE inputInterval 
                                          WHEN 1 THEN CAST(CEIL(((TRUNC(endTime, 'HH') - TRUNC(startTime, 'HH')) * 24)) AS INT)
                                          WHEN 2 THEN CAST(TRUNC(endTime, 'DD') - TRUNC(startTime, 'DD') AS INT)
                                          WHEN 3 THEN CAST(CEIL(((TRUNC(endTime, 'DD') - TRUNC(startTime, 'DD')) )/7) AS INT)
                                       END);
      RETURN intervalList; 

    END GET_INTERVAL_SEQUENCE_UDF;


CREATE OR REPLACE FUNCTION      Get_Context_Info_udf
    RETURN TTRFRMENGMACHINEINFOLIST AS vResult TTRFRMENGMACHINEINFOLIST;
    BEGIN    
        SELECT TTrfrmEngMachineInfo(ch.Context_ID, mac.Name)
        BULK COLLECT INTO vResult   
        FROM
            a ch  
        INNER JOIN
            b cxm  ON ch.CONTX_MACHINE_ID = cxm.CONTX_MACHINE_ID   
        INNER JOIN
            c mac ON cxm.MACHINE_ID = mac.MACHINE_ID   
        INNER JOIN
            d ic  ON mac.MACHINE_ID = ic.MACHINE_ID  
        WHERE 
            ic.ONFIGURABLE_ENTITY_ID =  HEXTORAW(Format_Guid_udf('11111111-FAE9-47A1-91A9-60A53E9660FE'))
            AND mac.IS_DELETED = 'N'
            AND ic.IS_DELETED = 'N';

        RETURN vResult; 
     END;

Answer 1

您可以按照 this OTN thread 中的建议调查时间花费在何处以及 Oracle 选择的执行计划。

问候，
罗布。