# Checking your data after the update of the time zone file
<a name="Appendix.Oracle.Options.Timezone-file-autoupgrade.checking"></a>

We recommend that you check your data after you update the time zone file. During the prepare step, RDS for Oracle automatically creates the following tables:
+ `rdsadmin.rds_dst_affected_tables` – Lists the tables that contain data affected by the update
+ `rdsadmin.rds_dst_error_table` – Lists the errors generated during the update

These tables are independent of any tables that you create in the prepare window. To see the results of the update, query the tables as follows.

```
SELECT * FROM rdsadmin.rds_dst_affected_tables;
SELECT * FROM rdsadmin.rds_dst_error_table;
```

For more information about the schema for the affected data and error tables, see [FIND\$1AFFECTED\$1TABLES Procedure](https://docs.oracle.com/en/database/oracle/oracle-database/19/arpls/DBMS_DST.html#GUID-1F977505-671C-4D5B-8570-86956F136199) in the Oracle documentation.