This LNCS conference volume constitutes the proceedings of 29th International Symposium on Database Engineered Applications, IDEAS 2025, in Newcastle upon Tyne, UK, in July 2025. The 13 full papers and 6 short papers included in this book were carefully reviewed and selected from 30 submissions. They were organized in topical sections as follows: language and models; classification; distributed systems; query answering and education; and data mining.

This LNCS conference volume constitutes the proceedings of 29th International Symposium on Database Engineered Applications, IDEAS 2025, in Newcastle upon Tyne, UK, in July 2025. The 13 full papers and 6 short papers included in this book were carefully reviewed and selected from 30 submissions. They were organized in topical sections as follows: language and models; classification; distributed systems; query answering and education; and data mining.