Oracle 11g 查詢需要將近 30 分鍾才能完成，但在 SQL Server 中大約需要 5 分鍾

Question

我需要生成使用預付費用戶的詳細報告。

基本上我有2張桌子。 TBL_USER 和 TBL_PREPAID_DETAILS

tbl_user 只列出用戶，而 tbl_prepaid_details 將包含所有預付費信息，如借方、貸方、余額、總充值。

報告將是這樣產生的：-

FULLNAME USER_ID NEW_BALANCE CREATED DEPOSIT DEBIT TOTAL_DEPOSIT
USER1 1 250 21/05/2011 500 250 1000
USER2 2 250 21/05/2011 500 250 1000
USER3 3 250 21/05/2011 500 250 1000
USER4 4 250 21/05/2011 500 250 1000

在此之前，我使用 SQL 服務器作為數據庫，但在 2012/2013 年我們需要從 SQL 服務器遷移到 Oracle 11g。

從之前的 sql 查詢 (SQL Server)，我得出了以下查詢 (Oracle 11g)。 我可以得到結果，但花了將近 30 分鍾才完成，而在 SQL 服務器中只花了大約 5 分鍾。 它只有 500+ 用戶

是我錯過了什么嗎？？ 是否有任何簡化版本可以加快流程？

SELECT DISTINCT A.FULLNAME AS NAME,
                A.USER_ID AS ID,
                B.NAME,

  (SELECT T.NEW_BAL
   FROM
     (SELECT NEW_BAL,
             USER_ID
      FROM TBL_PREPAID_DETAILS
      WHERE DATE_INSERT BETWEEN '01/01/2010' AND '14/11/2012'
      ORDER BY PREPAID_DETAIL_ID DESC) T
   WHERE T.USER_ID = A.USER_ID
     AND ROWNUM = 1) AS NEW_BALANCE,

  (SELECT T2.DATE_INSERT
   FROM
     (SELECT DATE_INSERT,
             USER_ID
      FROM TBL_PREPAID_DETAILS
      WHERE DATE_INSERT BETWEEN '01/01/2010' AND '14/11/2012'
      ORDER BY DATE_INSERT DESC)T2
   WHERE T2.USER_ID = A.USER_ID
     AND ROWNUM = 1) AS DATE_INSERT,

  (SELECT T3.PREV_BAL
   FROM
     (SELECT PREV_BAL,
             USER_ID
      FROM TBL_PREPAID_DETAILS
      WHERE DATE_INSERT BETWEEN '01/01/2010' AND '14/11/2012'
      ORDER BY PREPAID_DETAIL_ID ASC)T3
   WHERE T3.USER_ID = A.USER_ID
     AND ROWNUM = 1) AS DEPOSIT,

  (SELECT SUM(T4.CREDIT)
   FROM
     (SELECT CREDIT,
             USER_ID
      FROM TBL_PREPAID_DETAILS
      WHERE DATE_INSERT BETWEEN '01/01/2010' AND '14/11/2012'
      ORDER BY PREPAID_DETAIL_ID ASC)T4
   WHERE T4.USER_ID = A.USER_ID
     AND ROWNUM = 1) AS DEBIT,

  (SELECT SUM(T5.DEBIT + T5.PREV_BAL)
   FROM
     (SELECT DEBIT,
             PREV_BAL,
             USER_ID
      FROM TBL_PREPAID_DETAILS
      WHERE DATE_INSERT BETWEEN '01/01/2010' AND '14/11/2012'
      ORDER BY PREPAID_DETAIL_ID ASC)T5
   WHERE T5.USER_ID = A.USER_ID
     AND ROWNUM = 1) AS TOTAL_DEPOSIT
FROM TBL_USER A
LEFT JOIN TBL_PREPAID_DETAILS C ON A.USER_ID = C.USER_ID
LEFT JOIN TBL_ORGANIZATION_INFO B ON A.ORGANIZATION_ID = B.ORGANIZATION_ID
WHERE C.DATE_INSERT BETWEEN '01/01/2010' AND '14/11/2012'
  AND (A.USER_ID NOT IN ('xxx',
                         'xxx',
                         'xxx'))
GROUP BY A.FULLNAME,
         A.USER_ID,
         C.DATE_INSERT,
         B.NAME
ORDER BY A.FULLNAME;

Answer 1

請查看此頁面以獲取有關 Oracle Tuning 的一般概述幫助。 整體 Oracle 調優頁面

Oracle 提供了大量工具來調整性能，包括可以添加哪些索引來改進特定查詢。 當我遇到運行緩慢的查詢時，這是我做的第一件事。 在您的情況下，我會考慮對您的查詢運行解釋計划並查看 Oracle 的建議。 這是有關運行解釋計划的文檔。 Oracle 解釋計划