Database monitor view 3027 - Subquery Merge

Displays the SQL logical view format for database monitor QQQ3027.


Create View QQQ3027 as 
  (SELECT QQRID as Row_ID, 
          QQTIME as Time_Created, 
          QQJFLD as Join_Column, 
          QQRDBN as Relational_Database_Name, 
          QQSYS as System_Name, 
          QQJOB as Job_Name, 
          QQUSER as Job_User, 
          QQJNUM as Job_Number, 
          QQI9 as Thread_ID, 
          QQUCNT as Unique_Count, 
          QQUDEF as User_Defined, 
          QQQDTN as Unique_SubSelect_Number, 
          QQQDTL as SubSelect_Nested_Level, 
          QQMATN as Materialized_View_Subselect_Number, 
          QQMATL as Materialized_View_Nested_Level, 
          QVP15E as Materialized_View_Union_Level, 
          QVP15A as Decomposed_Subselect_Number, 
          QVP15B as Total_Number_Decomposed_SubSelects, 
          QVP15C as Decomposed_SubSelect_Reason_Code, 
          QVP15D as Starting_Decomposed_SubSelect, 
          QVRCNT as Unique_Refresh_Counter, 
          QVPARPF as Parallel_Prefetch, 
          QVPARPL as Parallel_PreLoad, 
          QVPARD as Parallel_Degree_Requested, 
          QVPARU as Parallel_Degree_Used, 
          QVPARRC as Parallel_Degree_Reason_Code, 
          QQEPT as Estimated_Processing_Time, 
          QVCTIM as Estimated_Cumulative_Time, 
          QQREST as Estimated_Rows_Selected, 
          QQAJN as Estimated_Join_Rows, 
          QQJNP as Join_Position, 
          QQI1 as DataSpace_Number, 
          QQC21 as Join_Method, 
          QQC22 as Join_Type, 
          QQC23 as Join_Operator, 
          QVJFANO as Join_Fanout, 
          QVFILES as Join_Table_Count, 
          QVP151 as Subselect_Number_of_Inner_Subquery, 
          QVP152 as Subselect_Level_of_Inner_Subquery, 
          QVP153 as Materialized_View_Subselect_Number_of_Inner, 
          QVP154 as Materialized_View_Nested_Level_of_Inner, 
          QVP155 as Materialized_View_Union_Level_of_Inner, 
          QQC101 as Subquery_Operator, 
          QVC21 as Subquery_Type, 
          QQC11 as Has_Correlated_Columns, 
          QVC3001 as Correlated_Columns, 
          QQSMINTF as Plan_Iteration_Number 
   FROM   UserLib/DBMONTable 
   WHERE  QQRID=3027)

Table 1. QQQ3027 - Subquery Merge
View Column Name	Table Column Name	Description
Row_ID	QQRID	Row identification
Time_Created	QQTIME	Time row was created
Join_Column	QQJFLD	Join column (unique per job)
Relational_Database_Name	QQRDBN	Relational database name
System_Name	QQSYS	System name
Job_Name	QQJOB	Job name
Job_User	QQUSER	Job user
Job_Number	QQJNUM	Job number
Thread_ID	QQI9	Thread identifier
Unique_Count	QQUCNT	Unique count (unique per query)
User_Defined	QQUDEF	User defined column
Unique_SubSelect_Number	QQQDTN	Subselect number for outer subquery
SubSelect_Nested_Level	QQQDTL	Subselect level for outer subquery
Materialized_View_Subselect_Number	QQMATN	Materialized view subselect number for outer subquery
Materialized_View_Nested_Level	QQMATL	Materialized view subselect level for outer subquery
Materialized_View_Union_Level	QVP15E	Materialized view union level
Decomposed_Subselect_Number	QVP15A	Decomposed query subselect number, unique across all decomposed subselects
Total_Number_Decomposed_SubSelects	QVP15B	Total number of decomposed subselects
Decomposed_SubSelect_Reason_Code	QVP15C	Decomposed query subselect reason code
Starting_Decomposed_SubSelect	QVP15D	Decomposed query subselect number for the first decomposed subselect
Unique_Refresh_Counter	QVRCNT	Unique refresh counter
Parallel_Prefetch	QVPARPF	Parallel Prefetch (Y/N)
Parallel_PreLoad	QVPARPL	Parallel Preload (index used)
Parallel_Degree_Requested	QVPARD	Parallel degree requested (index used)
Parallel_Degree_Used	QVPARU	Parallel degree used (index used)
Parallel_Degree_Reason_Code	QVPARRC	Reason parallel processing was limited (index used)
Estimated_Processing_Time	QQEPT	Estimated processing time, in seconds
Estimated_Cumulative_Time	QVCTIM	Estimated cumulative time, in seconds
Estimated_Rows_Selected	QQREST	Estimated rows selected
Estimated_Join_Rows	QQAJN	Estimated number of joined rows
Join_Position	QQJNP	Join position - when available
DataSpace_Number	QQI6	Dataspace number
Join_Method	QQC21	Join method - when available NL - Nested loop MF - Nested loop with selection HJ - Hash join
Join_Type	QQC22	Join type - when available IN - Inner join PO - Left partial outer join EX - Exception join
Join_Operator	QQC23	Join operator - when available EQ - Equal NE - Not equal GT - Greater than GE - Greater than or equal LT - Less than LE - Less than or equal CP - Cartesian product
Join_Fanout	QVJFANO	Join fan out. Possible values are: N - Normal join situation where fanout is allowed and each matching row of the join fanout is returned. D - Distinct fanout. Join fanout is allowed however none of the join fanout rows are returned. U - Unique fanout. Join fanout is not allowed. Error situation if join fanout occurs.
Join_Table_Count	QVFILES	Number of tables joined
Subselect_Number_of_Inner_Subquery	QVP151	Subselect number for inner subquery
Subselect_Level_of_Inner_Subquery	QVP152	Subselect level for inner subquery
Materialized_View_Subselect_Number _of_Inner	QVP153	Materialized view subselect number for inner subquery
Materialized_View_Nested_Level_of_Inner	QVP154	Materialized view subselect level for inner subquery
Materialized_View_Union_Level_of_Inner	QVP155	Materialized view union level for inner subquery
Subquery_Operator	QQC101	Subquery operator. Possible values are: EQ - Equal NE - Not Equal LT - Less Than or Equal LT - Less Than GE - Greater Than or Equal GT - Greater Than IN LIKE EXISTS NOT - Can precede IN, LIKE or EXISTS
Subquery_Type	QVC21	Subquery type. Possible values are: SQ - Subquery SS - Scalar subselect SU - Set Update
Has_Correlated_Columns	QQC11	Correlated columns exist (Y/N)
Correlated_Columns	QVC3001	List of correlated columns with corresponding QDT number
Plan_Iteration_Number	QQSMINTF	AQP Plan iteration number, original optimization = 1