federated search; cross-database search
A search that queries multiple databases or data sources simultaneously and aggregates the results. Common in enterprise and library systems.
This system has a federated search function.
Using federated search, you can look through multiple databases at once.
統合検索 often implies a unified index built from multiple sources, while 横串検索 emphasizes searching across separate systems in real time.
Compound of 横串 (horizontal skewer, metaphorically 'cross-cutting') and 検索 (search). The term likens searching across separate databases to skewering items horizontally.