Updated on 2024-11-05 GMT+08:00

PGXC_WLM_OPERATOR_HISTORY

PGXC_WLM_OPERATOR_HISTORY displays the operator information of completed jobs executed on all CNs. This view is used to query data from GaussDB(DWS). Data in the database is cleared 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

Name

Type

Description

nodename

text

Name of the CN where the statement is executed.

queryid

bigint

Internal query_id used for statement execution.

pid

bigint

ID of the backend thread.

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

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. Default value: 0.

max_spill_size

integer

Maximum spilled data among all DNs when a spill occurs. The unit is MB. Default value: 0.

average_spill_size

integer

Average spilled data among all DNs when a spill occurs. The unit is 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. 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:

  1. Sort/SetOp/HashAgg/HashJoin spill
  2. Spill file size large than 256MB
  3. Broadcast size large than 100MB
  4. Early spill
  5. Spill times is greater than 3
  6. Spill on memory adaptive
  7. Hash table conflict