If database connect strings change, then you can modify the database login credentials that are stored in the wallet.
To modify database login credentials in a wallet, enter the following command at the command line:
mkstore -wrl <wallet_location> -modifyCredential <dbase_alias>
<oracleusername> <password>
wallet_location is the path to the directory where the wallet is located.
The db_alias is a new or different alias you want to use to identify the database. It can be a TNS alias you use to specify the database in the tnsnames.ora file or any service name you use to identify the database on an Oracle network. The username and password are the new or different database login credentials.