Merge pull request #25779 from mariyaali/patch-6

Update create-materialized-view-as-select-transact-sql.md

Author: prmerger-automator[bot]

docs/t-sql/statements/create-materialized-view-as-select-transact-sql.md

@@ -4,7 +4,7 @@ description: CREATE MATERIALIZED VIEW AS SELECT (Transact-SQL)
 author: markingmyname
 ms.author: maghan
 ms.reviewer: xiaoyul
-ms.date: 07/20/2022
+ms.date: 01/25/2023
 ms.service: sql
 ms.subservice: data-warehouse
 ms.topic: reference
@@ -90,6 +90,7 @@ Distributes the rows based on the hash values of up to eight columns, allowing f
 > - To enable this preview feature, join the preview by changing the database's compatibility level to 9000 with this command. For more information on setting the database compatibility level, see [ALTER DATABSE SCOPED CONFIGURATION](./alter-database-scoped-configuration-transact-sql.md). For example: `DATABASE SCOPED CONFIGURATION SET DW_COMPATIBILITY_LEVEL = 9000;`
 > - To opt-out the preview, run this command to change the database's compatibility level to AUTO. For example: `ALTER DATABASE SCOPED CONFIGURATION SET DW_COMPATIBILITY_LEVEL = AUTO;` This will disable the multi-column distribution (MCD) feature (preview). Existing MCD materialized views will stay but become unreadable. 
 >     - To regain access to MCD materialized views, opt-in the preview again. 
+> - Preview features are meant for testing only and should not be used on production instances or production data. Please keep a copy of your test data if the data is important.
 
 #### *select_statement*   
 The SELECT list in the materialized view definition needs to meet at least one of these two criteria:
@@ -271,4 +272,4 @@ GO
 
 ## Next steps
 
-- [Performance tuning with Materialized View](/azure/sql-data-warehouse/performance-tuning-materialized-views)
+- [Performance tuning with Materialized View](/azure/sql-data-warehouse/performance-tuning-materialized-views)