# Babelfish limitations
<a name="babelfish-limitations"></a>

 The following limitations currently apply to Babelfish for Aurora PostgreSQL: 
+  Babelfish doesn't support the following Aurora features: 
  + AWS Identity and Access Management
  + Database Activity Streams (DAS)
  + RDS Data API with Aurora PostgreSQL Serverless v2 and provisioned
  + RDS Proxy with RDS for SQL Server
  + Salted challenge response authentication mechanism (SCRAM)
  + Query editor
  + Zero-ETL integrations
+  Babelfish doesn't provide the following client driver API support: 
  +  API requests with the connection attributes related to Microsoft Distributed Transaction Coordinator (MSDTC) aren't supported. These include XA calls by the SQLServerXAResource class in the SQL server JDBC driver. 
+ Babelfish currently doesn't support the following Aurora PostgreSQL extensions:
  + `bloom`
  + `btree_gin`
  + `btree_gist`
  + `citext`
  + `cube`
  + `hstore`
  + `hypopg`
  + Logical replication using `pglogical`
  + `ltree`
  + `pgcrypto`
  + Query plan management using `apg_plan_mgmt`

  To learn more about PostgreSQL extensions, see [Working with extensions and foreign data wrappers](Appendix.PostgreSQL.CommonDBATasks.md).
+ The open source [jTDS driver](https://github.com/milesibastos/jTDS/) that is designed as an alternative to the Microsoft JDBC driver is not supported.