Start of change

Database monitor view 3000 - Table Scan

Create View QQQ3000 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,
          QQTLN as System_Table_Schema, 
          QQTFN as System_Table_Name, 
          QQTMN as Member_Name, 
          QQPTLN as System_Base_Table_Schema, 
          QQPTFN as System_Base_Table_Name, 
          QQPTMN as Base_Member_Name, 
          QQTOTR as Table_Total_Rows, 
          QQREST as Estimated_Rows_Selected, 
          QQAJN as Estimated_Join_Rows, 
          QQEPT as Estimated_Processing_Time, 
          QQJNP as Join_Position, 
          QQI1 as DataSpace_Number,
          QQC21 as Join_Method, 
          QQC22 as Join_Type,
          QQC23 as Join_Operator,
          QQI2 as Index_Advised_Columns_Count,
          QQDSS as DataSpace_Selection, 
          QQIDXA as Index_Advised, 
          QQRCOD as Reason_Code, 
          QQIDXD as Index_Advised_Columns, 
          QVQTBL as Table_Name, 
          QVQLIB as Table_Schema, 
          QVPTBL as Base_Table_Name, 
          QVPLIB as Base_Table_Schema, 
          QVBNDY as Bound, 
          QVRCNT as Unique_Refresh_Counter, 
          QVJFANO as Join_Fanout,  
          QVFILES as Join_Table_Count, 
          QVPARPF as Parallel_Prefetch, 
          QVPARPL as Parallel_PreLoad, 
          QVPARD as Parallel_Degree_Requested, 
          QVPARU as Parallel_Degree_Used, 
          QVPARRC as Parallel_Degree_Reason_Code, 
          QVCTIM as Estimated_Cumulative_Time, 
          QQC11 as Skip_Sequential_Table_Scan, 
          QQI3 as Table_Size, 
          QVC3001 as DataSpace_Selection_Columns, 
          QQC14 as Derived_Column_Selection, 
          QVC3002 as Derived_Column_Selection_Columns, 
          QQC18 as Read_Trigger, 
          QVP157 as UDTF_Cardinality, 
          QVC1281 as UDTF_Specific_Name, 
          QVC1282 as UDTF_Specific_Schema,
          QVP154 as Pool_Size,
          QVP155 as Pool_Id,
          QQC13 as MQT_Replacement
  
   FROM   UserLib/DBMONTABLE
   WHERE  QQRID=3000)
Table 1. QQQ3000 - Table Scan
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 Unique subselect number
SubSelect_Nested_Level QQQDTL Subselect nested level
Materialized_View_Subselect_Number QQMATN Materialized view subselect number
Materialized_View_Nested_Level QQMATL Materialized view nested level
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
System_Table_Schema QQTLN Schema of table queried
System_Table_Name QQTFN Name of table queried
Member_Name QQTMN Member name of table queried
System_Base_Table_Schema QQPTLN Schema name of base table
System_Base_Table_Name QQPTFN Name of base table for table queried
Base_Member_Name QQPTMN Member name of base table
Table_Total_Rows QQTOTR Total rows in table
Estimated_Rows_Selected QQREST Estimated number of rows selected
Estimated_Join_Rows QQAJN Estimated number of joined rows
Estimated_Processing_Time QQEPT Estimated processing time, in seconds
Join_Position QQJNP Join position - when available
DataSpace_Number QQI1 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
Index_Advised_Columns_Count QQI2 Number of advised columns that use index scan-key positioning
DataSpace_Selection QQDSS Dataspace selection
  • Y - Yes
  • N - No
Index_Advised QQIDXA Index advised
  • Y - Yes
  • N - No
Reason_Code QQRCOD Reason code
  • T1 - No indexes exist.
  • T2 - Indexes exist, but none can be used.
  • T3 - Optimizer chose table scan over available indexes.
Index_Advised_Columns QQIDXD Columns for the index advised
Table_Name QVQTBL Queried table, long name
Table_Schema QVQLIB Schema of queried table, long name
Base_Table_Name QVPTBL Base table, long name
Base_Table_Schema QVPLIB Schema of base table, long name
Bound QVBNDY I/O or CPU bound. Possible values are:
  • I - I/O bound
  • C - CPU bound
Unique_Refresh_Counter QVRCNT Unique refresh counter
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
Parallel_Prefetch QVPARPF Parallel Prefetch (Y/N)
Parallel_PreLoad QVPARPL Parallel Preload (Y/N)
Parallel_Degree_Requested QVPARD Parallel degree requested
Parallel_Degree_Used QVPARU Parallel degree used
Parallel_Degree_Reason_Code QVPARRC Reason parallel processing was limited
Estimated_Cumulative_Time QVCTIM Estimated cumulative time, in seconds
Skip_Sequential_Table_Scan QQC11 Skip sequential table scan (Y/N)
Table_Size QQI3 Size of table being queried
DataSpace_Selection_Columns QVC3001 Columns used for dataspace selection
Derived_Column_Selection QQC14 Derived column selection (Y/N)
Derived_Column_Selection_Columns QVC3002 Columns used for derived column selection
Read_Trigger QQC18 Read Trigger (Y/N)
UDTF_Cardinality QVP157 User-defined table function Cardinality
UDTF_Specific_Name QVC1281 User-defined table function specific name
UDTF_Specific_Schema QVC1282 User-defined table function specific schema
Pool_Size QVP154 Pool size
Pool_Id QVP155 Pool id
MQT_Replacement QQC13 Materialized Query Table replaced queried table (Y/N)
Parent topic: Optional database monitor SQL view format
End of change