PGXC_WLM_OPERATOR_HISTORY

PGXC_WLM_OPERATOR_HISTORY displays operator information when a job is finished on all CNs. This view is used to query data from DWS, and the data in the database is cleared periodically every 3 minutes.

Only the system administrator or the preset role gs_role_read_all_stats can access this view. For details about columns in the view, see Table 1.

**Table 1** GS_WLM_OPERATOR_INFO columns
Column	Type	Description
nodename	Text	Name of the CN where the statement is executed
queryid	Bigint	Internal query_id used for statement execution
pid	Bigint	Backend thread ID
plan_node_id	Integer	plan_node_id of the execution plan of a query
plan_node_name	Text	Name of the operator corresponding to plan_node_id
start_time	Timestamp with time zone	Time when an operator starts to process the first data record
duration	Bigint	Total execution time of an operator. The unit is ms.
query_dop	Integer	Degree of parallelism (DOP) of the current operator
estimated_rows	Bigint	Number of rows estimated by the optimizer
tuple_processed	Bigint	Number of elements returned by the current operator
min_peak_memory	Integer	Minimum peak memory used by the current operator on all DNs. The unit is MB.
max_peak_memory	Integer	Maximum peak memory used by the current operator on all DNs. The unit is MB.
average_peak_memory	Integer	Average peak memory used by the current operator on all DNs. The unit is MB.
memory_skew_percent	Integer	Memory usage skew of the current operator among DNs
min_spill_size	Integer	Minimum spilled data among all DNs when a spill occurs. The unit is MB. The default value is 0.
max_spill_size	Integer	Maximum spilled data among all DNs when a spill occurs. The unit is MB. The default value is 0.
average_spill_size	Integer	Average spilled data among all DNs when a spill occurs. The unit is MB. The default value is 0.
spill_skew_percent	Integer	DN spill skew when a spill occurs
min_cpu_time	Bigint	Minimum execution time of the operator on all DNs. The unit is ms.
max_cpu_time	Bigint	Maximum execution time of the operator on all DNs. The unit is ms.
total_cpu_time	Bigint	Total execution time of the operator on all DNs. The unit is ms.
cpu_skew_percent	Integer	Skew of the execution time among DNs.
warning	Text	Warning. The following warnings are displayed: Sort/SetOp/HashAgg/HashJoin spill Spill file size large than 256MB Broadcast size large than 100MB Early spill Spill times is greater than 3 Spill on memory adaptive Hash table conflict