OPERATOR_HISTORY_TABLE

OPERATOR_HISTORY_TABLE displays records about operators of completed jobs. Data is dumped from the kernel to this system catalog, as described in Table 1.

**Table 1** OPERATOR_HISTORY_TABLE columns
Name	Type	Description
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 the plan node ID.
start_time	timestamp with time zone	Time when the operator starts to process the first data record.
duration	bigint	Total execution time of the operator (unit: ms).
query_dop	integer	DOP of the operator.
estimated_rows	bigint	Number of rows estimated by the optimizer.
tuple_processed	bigint	Number of elements returned by the operator.
min_peak_memory	integer	Minimum peak memory used by the operator on all DNs (unit: MB).
max_peak_memory	integer	Maximum peak memory used by the operator on all DNs (unit: MB).
average_peak_memory	integer	Average peak memory used by the operator on all DNs (unit: MB).
memory_skew_percent	integer	Memory usage skew of the operator among each DN.
min_spill_size	integer	Minimum spilled data among all DNs when a spill occurs (unit: MB; default value: 0).
max_spill_size	integer	Maximum spilled data among all DNs when a spill occurs (unit: MB; default value: 0).
average_spill_size	integer	Average spilled data among all DNs when a spill occurs (unit: MB; default value: 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 (unit: ms).
max_cpu_time	bigint	Maximum execution time of the operator on all DNs (unit: ms).
total_cpu_time	bigint	Total execution time of the operator on all DNs (unit: 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