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/). 

# Creating, altering, and deleting users
<a name="r_Users-creatingaltering-and-deleting-users"></a>

Database users are global across a data warehouse cluster (and not for each individual database). 
+  To create a user, use the [CREATE USER](r_CREATE_USER.md) command. 
+  To create a superuser, use the [CREATE USER](r_CREATE_USER.md) command with the CREATEUSER option. 
+ To remove an existing user, use the [DROP USER](r_DROP_USER.md) command. 
+ To change a user, for example changing a password, use the [ALTER USER](r_ALTER_USER.md) command. 
+ To view a list of users, query the PG\$1USER catalog table.

  ```
  select * from pg_user;
  
    usename   | usesysid | usecreatedb | usesuper | usecatupd |  passwd  | valuntil | useconfig
  ------------+----------+-------------+----------+-----------+----------+----------+-----------
   rdsdb      |        1 | t           | t        | t         | ******** |          |
   masteruser |      100 | t           | t        | f         | ******** |          |
   dwuser     |      101 | f           | f        | f         | ******** |          |
   simpleuser |      102 | f           | f        | f         | ******** |          |
   poweruser  |      103 | f           | t        | f         | ******** |          |
   dbuser     |      104 | t           | f        | f         | ******** |          |
  (6 rows)
  ```