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Amazon Redshift
Database Developer Guide (API Version 2012-12-01)

STV_WLM_QUERY_TASK_STATE

Contains the current state of service class query tasks.

STV_WLM_QUERY_TASK_STATE is visible to all users. Superusers can see all rows; regular users can see only their own data. For more information, see Visibility of Data in System Tables and Views.

Table Columns

Column Name Data Type Description
service_class integer ID for the service class. Service classes are defined in the WLM configuration.
task integer ID used to track a query through the workload manager. Can be associated with multiple query IDs. If a query is restarted, the query is assigned a new query ID but not a new task ID.
query integer Query ID. If a query is restarted, the query is assigned a new query ID but not a new task ID.
slot_count integer Number of WLM query slots.
start_time timestamp Time that the query began executing.
exec_time bigint Number of microseconds that the query has been executing.

Sample Query

Service classes 1 - 4 are used internally by Amazon Redshift, and service class 5 is reserved for the dedicated superuser queue. The following query displays the current state of queries in service classes greater than 4, which are the superuser queue and the WLM query queues.

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select * from stv_wlm_query_task_state where service_class > 4;

This query returns the following sample output:

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service_class | task | query | start_time | exec_time --------------+------+-------+----------------------------+----------- 5 | 466 | 491 | 2010-10-06 13:29:23.063787 | 357618748 (1 row)

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