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://aws.amazon.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/). 

# STL\$1STREAM\$1SEGS
<a name="r_STL_STREAM_SEGS"></a>

Lists the relationship between streams and concurrent segments.

Streams in this context are Amazon Redshift streams. This system view doesn't pertain to [Streaming ingestion to a materialized view](materialized-view-streaming-ingestion.md).

STL\$1STREAM\$1SEGS 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).

**Note**  
STL\$1STREAM\$1SEGS only contains queries run on main provisioned clusters. It doesn't contain queries run on concurrency scaling clusters or on serverless namespaces. To access explain plans for queries run on both main clusters, concurrency scaling clusters, and serverless namespaces, we recommend that you use the SYS monitoring view [SYS\$1QUERY\$1DETAIL](SYS_QUERY_DETAIL.md) . The data in the SYS monitoring view is formatted to be easier to use and understand.

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

[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/redshift/latest/dg/r_STL_STREAM_SEGS.html)

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

To view the relationship between streams and concurrent segments for the most recent query, type the following query: 

```
select *
from stl_stream_segs
where query = pg_last_query_id();

 query | stream | segment
-------+--------+---------
    10 |      1 |       2
    10 |      0 |       0
    10 |      2 |       4
    10 |      1 |       3
    10 |      0 |       1
(5 rows)
```