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\$1BCAST
STL\$1BCAST

Logs information about network activity during execution of query steps that broadcast data. Network traffic is captured by numbers of rows, bytes, and packets that are sent over the network during a given step on a given slice. The duration of the step is the difference between the logged start and end times.

To identify broadcast steps in a query, look for bcast labels in the SVL\$1QUERY\$1SUMMARY view or run the EXPLAIN command and then look for step attributes that include bcast.

STL\$1BCAST 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\$1BCAST 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
Table columns

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

### Sample queries
Sample queries

The following example returns broadcast information for the queries where there are one or more packets, and the difference between the start and end of the query was one second or more. 

```
select query, slice, step, rows, bytes, packets, datediff(seconds, starttime, endtime)
from stl_bcast
where packets>0 and datediff(seconds, starttime, endtime)>0;
```

```
 query | slice | step | rows | bytes | packets | date_diff
-------+-------+------+------+-------+---------+-----------
   453 |     2 |    5 |    1 |   264 |       1 |         1
   798 |     2 |    5 |    1 |   264 |       1 |         1
  1408 |     2 |    5 |    1 |   264 |       1 |         1
  2993 |     0 |    5 |    1 |   264 |       1 |         1
  5045 |     3 |    5 |    1 |   264 |       1 |         1
  8073 |     3 |    5 |    1 |   264 |       1 |         1
  8163 |     3 |    5 |    1 |   264 |       1 |         1
  9212 |     1 |    5 |    1 |   264 |       1 |         1
  9873 |     1 |    5 |    1 |   264 |       1 |         1
(9 rows)
```