Question

你能否对可能造成的问题提出任何想法8.2是否有大量的“字节”？提前谢谢。

   8.2 INDEX UNIQUE SCAN S_ORG_EXT_P1 -T146208  (Cost = 1 Rows = 9390061 Bytes = 112680732 )Acc=>"A1"."ROW_ID"="A4"."PR_DEPT_OU_ID"

完整的解释计划

 SELECT STATEMENT    Cost =37 (Cost = 37 Rows =  Bytes =  )
1.1 NESTED LOOPS     (Cost = 37 Rows = 1 Bytes = 361 )
 2.1 NESTED LOOPS     (Cost = 34 Rows = 1 Bytes = 317 )
  3.1 NESTED LOOPS     (Cost = 32 Rows = 1 Bytes = 273 )
   4.1 NESTED LOOPS     (Cost = 21 Rows = 1 Bytes = 245 )
    5.1 NESTED LOOPS     (Cost = 19 Rows = 1 Bytes = 201 )
     6.1 NESTED LOOPS     (Cost = 8 Rows = 1 Bytes = 179 )
      7.1 NESTED LOOPS     (Cost = 5 Rows = 1 Bytes = 135 )
       8.1 NESTED LOOPS     (Cost = 4 Rows = 1 Bytes = 123 )
        9.1 TABLE ACCESS BY INDEX ROWID S_OPTY -T203229  (Cost = 3 Rows = 1 Bytes = 29 ) Fil => "A4"."PR_DEPT_OU_ID" IS NOT NULL
         10.1 INDEX UNIQUE SCAN S_OPTY_P1 -T203252  (Cost = 2 Rows = 1 Bytes =  )Acc=>"A4"."ROW_ID"=:V1
        9.2 TABLE ACCESS BY INDEX ROWID S_SALES_METHOD -T134134  (Cost = 1 Rows = 327 Bytes = 30738 )
         10.1 INDEX UNIQUE SCAN S_SALES_METHOD_P1 -T143711  (Cost = 0 Rows = 1 Bytes =  )Acc=>"A5"."ROW_ID"="A4"."SALES_METHOD_ID"
       8.2 INDEX UNIQUE SCAN S_ORG_EXT_P1 -T146208  (Cost = 1 Rows = 9390061 Bytes = 112680732 )Acc=>"A1"."ROW_ID"="A4"."PR_DEPT_OU_ID"
      7.2 INDEX RANGE SCAN S_ORG_EXT_XM_BUCS1 -T246873  (Cost = 3 Rows = 1 Bytes = 44 )Acc=>"A2"."PAR_ROW_ID"="A1"."ROW_ID" AND "A2"."TYPE"='ACCOUNT_TIER' Fil => ("A2"."ATTRIB_03" IS NOT NULL AND "A2"."ATTRIB_04" IS NOT NULL)
     6.2 TABLE ACCESS BY INDEX ROWID S_POS_SKILL_IT -T133800  (Cost = 11 Rows = 10 Bytes = 220 )
      7.1 INDEX RANGE SCAN S_POS_SKILL_IT_F2 -T246871  (Cost = 2 Rows = 10 Bytes =  )Acc=>"A9"."LO_CHAR1"="A5"."NAME"
    5.2 TABLE ACCESS BY INDEX ROWID S_POS_SKILL -T133799  (Cost = 2 Rows = 1 Bytes = 44 ) Fil => "A7"."ASGN_IT_TYPE_NAME"='HPQ Opportunity Sales Method'
     6.1 INDEX UNIQUE SCAN S_POS_SKILL_P1 -T142149  (Cost = 1 Rows = 1 Bytes =  )Acc=>"A7"."ROW_ID"="A9"."POSTN_SKILL_ID"
   4.2 TABLE ACCESS BY INDEX ROWID S_POS_SKILL_IT -T133800  (Cost = 11 Rows = 1 Bytes = 28 ) Fil => ("A8"."LO_CHAR3" IS NOT NULL AND "A8"."LO_CHAR2" IS NOT NULL AND "A8"."LO_CHAR2"="A2"."ATTRIB_04")
    5.1 INDEX RANGE SCAN S_POS_SKILL_IT_F2 -T246871  (Cost = 2 Rows = 10 Bytes =  )Acc=>"A8"."LO_CHAR1"="A2"."ATTRIB_03"
  3.2 TABLE ACCESS BY INDEX ROWID S_POS_SKILL -T133799  (Cost = 2 Rows = 1 Bytes = 44 ) Fil => ("A6"."ASGN_IT_TYPE_NAME"='HPQ BU Tier BUCS' AND "A6"."POSTN_ID"="A7"."POSTN_ID")
   4.1 INDEX UNIQUE SCAN S_POS_SKILL_P1 -T142149  (Cost = 1 Rows = 1 Bytes =  )Acc=>"A6"."ROW_ID"="A8"."POSTN_SKILL_ID"
 2.2 INDEX RANGE SCAN S_ORG_EXT_XM_BUCS1 -T246873  (Cost = 3 Rows = 1 Bytes = 44 )Acc=>"A3"."PAR_ROW_ID"="A1"."ROW_ID" AND "A3"."TYPE"='BU_CUSTOMER_SEGMENT' AND "A8"."LO_CHAR3"."A3"."ATTR Fil" => ("A3"."ATTRIB_03" IS NOT NULL AND "A3"."ATTRIB_04" IS NOT NULL)

Answer 1

它正在对超过900万行进行索引扫描，其中每行只有12个字节。

因此，导致大量字节的行数很多。如果您不希望它访问所有数据，您应该尝试避免索引扫描。

SQL调优 - 解释计划中的大量“字节”

1 个答案: