# Prerequisites for the XStream mode

Before configuring CDC using XStream mode in Talend Studio, the administrator of the Oracle database should do the following:

1. [Activate the archive log mode in Oracle XStream mode](https://help.qlik.com/talend/en-US/studio-user-guide/8.0/activate-archive-log-mode-in-oracle-xstream-mode);

2. [Open all PDBs for a CDB in Oracle](https://help.qlik.com/talend/en-US/studio-user-guide/8.0/open-all-pdbs-for-cdb-in-oracle);

3. [Configure an XStream administrator](https://help.qlik.com/talend/en-US/studio-user-guide/8.0/configure-xstream-administrator).

### In this section

* [Activate the archive log mode in Oracle XStream mode](https://help.qlik.com/talend/en-US/studio-user-guide/8.0-R2024-07/activate-archive-log-mode-in-oracle-xstream-mode)
* [Open all PDBs for a CDB in Oracle](https://help.qlik.com/talend/en-US/studio-user-guide/8.0-R2024-07/open-all-pdbs-for-cdb-in-oracle)
* [Configure an XStream administrator](https://help.qlik.com/talend/en-US/studio-user-guide/8.0-R2024-07/configure-xstream-administrator)