Amazon Redshift will no longer support the creation of new Python UDFs starting Patch 198. Existing Python UDFs will continue to function until June 30, 2026. For more information, see the [ blog post ](https://amazonaws-china.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/). 

# STL\$1WLM\$1QUERY
<a name="r_STL_WLM_QUERY"></a>

Contains a record of each attempted execution of a query in a service class handled by WLM.

STL\$1WLM\$1QUERY 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](cm_chap_system-tables.md#c_visibility-of-data).

Some or all of the data in this table can also be found in the SYS monitoring view [SYS\$1QUERY\$1HISTORY](SYS_QUERY_HISTORY.md). The data in the SYS monitoring view is formatted to be easier to use and understand. We recommend that you use the SYS monitoring view for your queries.

## Table columns
<a name="r_STL_WLM_QUERY-table-columns"></a>

[\[See the AWS documentation website for more details\]](http://docs.amazonaws.cn/en_us/redshift/latest/dg/r_STL_WLM_QUERY.html)

## Sample queries
<a name="r_STL_WLM_QUERY-sample-queries"></a>

 **View average query Time in queues and executing** 

The following queries display the current configuration for service classes greater than 4. For a list of service class IDs, see [WLM service class IDs](cm-c-wlm-system-tables-and-views.md#wlm-service-class-ids).

The following query returns the average time (in microseconds) that each query spent in query queues and executing for each service class. 

```
select service_class as svc_class, count(*),
avg(datediff(microseconds, queue_start_time, queue_end_time)) as avg_queue_time,
avg(datediff(microseconds, exec_start_time, exec_end_time )) as avg_exec_time
from stl_wlm_query
where service_class > 4
group by service_class
order by service_class;
```

This query returns the following sample output: 

```
 svc_class | count | avg_queue_time | avg_exec_time
-----------+-------+----------------+---------------
         5 | 20103 |              0 |         80415
         5 |  3421 |          34015 |        234015
         6 |    42 |              0 |        944266
         7 |   196 |           6439 |       1364399
(4 rows)
```

 **View maximum query time in queues and executing** 

The following query returns the maximum amount of time (in microseconds) that a query spent in any query queue and executing for each service class.

```
select service_class as svc_class, count(*),
max(datediff(microseconds, queue_start_time, queue_end_time)) as max_queue_time,
max(datediff(microseconds, exec_start_time, exec_end_time )) as max_exec_time
from stl_wlm_query
where svc_class > 5  
group by service_class
order by service_class;
```

```
 svc_class | count | max_queue_time | max_exec_time
-----------+-------+----------------+---------------
         6 |    42 |              0 |       3775896
         7 |   197 |          37947 |      16379473
(4 rows)
```