Question

如何在oracle 10g中设置sort_area_size以及应该是什么尺寸，因为我在单个表中有超过2.2m的行。请告诉我SORT_AREA_RETAINED_SIZE的建议大小

因为我的查询太慢，所以需要1个多小时才能完成。（大多）请建议我如何优化我的查询和调整数据库oracle 10g

感谢

使用查询

更新

查询

SELECT   A.TITLE,C.TOWN_VILL U_R,F.CODE TOWN_CODE,F.CITY_TOWN_MAKE,A.FRM,A.PRD_CODE,A.BR_CODE,A.SIZE_CODE ,B.PRICES, 
       A.PROJECT_YY,A.PROJECT_MM,d.province ,D.BR_CODE  BRANCH_CODE,D.STRATUM,L.LSM_GRP LSM, 
         SUM(GET_FRAC_FACTOR_ALL_PR_NEW(A.FRM,A.PRD_CODE,A.BR_CODE,A.SIZE_CODE,A.PROJECT_YY,A.PROJECT_MM,A.FRAC_CODE ,B.PRICES,A.QTY_USED,A.VERIF_CODE, A.PACKING_CODE, J.TYPE ,'R') )  
        * MAX(D.UNIVERSE) / MAX(E.SAMPLE)   /1000000   MARKET ,  D.UNIVERSE ,E.SAMPLE  
FROM A2_FOR_CPMARKETS  A, 
     BRAND  J, 
     PRICES B,CP_SAMPLE_ALL_MONTHS C ,
     CP_LSM L, 
     HOUSEHOLD_GL D, 
     SAMPLE_CP_ALL_MONTHS E , 
     City_Town_ALL F   
WHERE A.PRD_CODE = B.PRD_CODE 
AND A.BR_CODE = B.BR_CODE 
AND DECODE(A.SIZE_CODE,NULL,'L',A.SIZE_CODE) = B.SIZE_CODE -- for unbranded loose  
AND DECODE(B.VAR_CODE,'X','X',A.VAR_CODE) = B.VAR_CODE  
AND DECODE(B.COL_CODE,'X','X',A.COL_CODE) = B.COL_CODE  
AND DECODE(B.PACK_CODE,'X','X',A.PACKING_CODE) = B.PACK_CODE  
AND A.project_yy||A.project_MM BETWEEN B.START_DATE AND B.END_DATE  
AND A.PRD_CODE=J.PRD_CODE 
AND A.BR_CODE=J.BR_CODE 
AND A.FRM = C.FRM 
AND A.PROJECT_YY=L.YEAR 
AND A.frm=L.FORM_NO 
AND C.TOWN_VILL= D.U_R 
AND C.CLASS = D.CLASS 
AND D.TOWN=F.GRP 
AND D.TOWN = E.TOWN_CODE 
AND A.PROJECT_YY = E.PROJECT_YY 
AND A.PROJECT_MM = E.PROJECT_MM 
AND A.PROJECT_YY = C.PROJECT_YY 
AND A.PROJECT_MM = C.PROJECT_MM 
 -- FOR HOUSEJOLD_GL  
AND A.PROJECT_YY = D.YEAR 
AND A.PROJECT_MM = D.MONTH 


-- END HOUSEHOLD_GL  
AND C.TOWN_VILL = E.TOWN_VILL 
AND C.CLASS = E.CLASS 

AND C.TOWN_VILL = F.TOWN_VILL 
AND C.TOWN_CODE=F.CODE 

 AND (DECODE(e.PROJECT_YY,'1997','1','1998','1','1999','1','2000','1','2001','1','2002','1','2') = F.TYP ) 
GROUP BY A.TITLE,C.TOWN_VILL,F.CODE ,F.CITY_TOWN_MAKE,A.FRM,A.PRD_CODE,A.BR_CODE,A.SIZE_CODE ,B.PRICES, 
      A.PROJECT_YY,A.PROJECT_MM,d.province,D.BR_CODE ,D.STRATUM,L.LSM_GRP , 
      UNIVERSE ,E.SAMPLE

！[alt text] [1]

[1]：http://C：\ Documents and Settings \ Hussain \ My Documents \ My Pictures \ explain plan.jpg

Answer 1

点击此处查看SORT_AREA_SIZE的Oracle文档。您可以使用alter session set sort_area_size=10000命令为会话和alter system系统修改此命令。对于SORT_AREA_RETAINED_SIZE，它的方式相同。

您是否在结果集中获取了整个表（ 2.2 m行）？是否有某种排序操作？

查询执行不当可能还有其他一些原因。你能分享查询和解释计划吗？

Answer 2

当您使用DBMS_Xplan.Display方法运行查询的执行计划时，oracle将估计（通常非常合理地）执行它所需的临时表空间存储大小。

顺便说一下，2.2百万行可能与排序大小无关。聚合操作（如MAX和SUM）所需的内存与结果集的大小相关，而不是与源数据的大小相关。

提供存储在您电脑上的jpg文件的链接并不算是提供了执行计划，顺便说一句。

Answer 3

A.project_yy||A.project_MM BETWEEN B.START_DATE AND B.END_DATE

你知道我们在数据库中有DATE数据类型，对吗？使用不正确的数据类型使Oracle更难确定数据分布，谓词选择性和适当的查询计划

如何sort_area_size增加

使用查询

3 个答案: