SingleStore DB

mv_tasks

The mv_tasks view in the information_schema database is a detailed profile of all currently running tasks on all nodes of the cluster.

It holds a row per running task. Each row reports the profiling statistics of the task, as collected between the time it began and the current time.

mv_tasks may only be queried while connected to an aggregator node.

We recommend against extensive use of this table. It will hide the performance impact of short-lived but frequent tasks, and exaggerate the impact of long-lived tasks.

Column name

Description

node_id

An ID equal to id in the row of mv_nodes describing the node on which the task is running.

activity_type

The type of the task’s activity.

activity_name

An ID shared by all instances of the task’s activity. This ID is often human-readable, but does not include the query text for query tasks.

aggregator_activity_name

The aggregator_activity_name of the task’s activity.

database_name

The name of the database associated with the task’s activity, or NULL if none could be assigned.

partition_id

The unique ID of the database partition associated with the task’s activity, or NULL if none could be assigned.

raw_task_name

The full name associated with the task, or NULL if none could be assigned. In particular, this will hold the raw query text for query tasks. It differs from query_text in mv_nodes because it is fully parameterized. Note that this column is only available in mv_tasks.

EXTENDED STATISTICS

This view contains all extended statistics columns.