Home > Storage > Data Storage Essentials > AppSync > Dell AppSync: Integration with Oracle Database Server > Discovery failure or status displayed as offline
This section provides information about how to troubleshoot certain issues that customers may encounter when using AppSync with Oracle.
For automatic discovery of Oracle databases, several Oracle queries are run at the start of the copy. Whenever AppSync operations fail with Oracle SQL errors, it is important to get the results of those queries.
sqlplus / as sysdba
select * from dba_data_files;select instance_name, status, database_status from v$instance;