If you are using Embedded Search, the database that is used determines whether you need to run an additional system with search technology parallel to the SAP system.
Whether you need an additional system with separate search technology to run Embedded Search depends on the database that you are using to store your business data in your SAP system.
The following variants are possible:
You are using SAP HANA as the database. If you store your business data in SAP HANA, you do not require any additional search technology to use Embedded Search. Embedded Search enables direct search access to your business data stored in the tables in SAP HANA.
Variant 2: TREX/BWA-based
You are using one of the databases listed in the PAM for SAP Business Suite, but not SAP HANA. In this scenario, you need to connect an additional search technology. This can be either the standalone engine Search and Classification (TREX) or SAP NetWeaver Business Warehouse Accelerator (BWA).