1 Plan your installation

• Prerequisites to upgrade (upgrade only)
  You should be running Oracle Empirica Signal release 9.1 or later before upgrading to release 2025.4.01.
• Migrate the database (upgrade only)
  If you are migrating your database from Microsoft Windows to Linux, or upgrading from an earlier version of the Oracle Database to version 19c, back up your database first.
• Information to collect before you begin
  Before you begin, collect the following information about the setup of the database and application servers. You will need this information for the installation or upgrade.