Enscribe is the native hierarchical database in HP NonStop (Tandem) servers

Tandem Computers

Tandem Computers, Inc. was the dominant manufacturer of fault-tolerant computer systems for ATM networks, banks, stock exchanges, telephone switching centers, and other similar commercial transaction processing applications requiring maximum uptime and zero data loss. The company was founded in...

. It supports the five file structures: unstructured, key-sequenced, entry-sequenced, relative and queue. Enscribe supports partitioned files which spans across multiple physical disks. It supports locking at file and record levels. The Guardian APIs or the utility FUP (File Utility Program) can be used to work with Enscribe files.

Many of the applications developed in HP NonStop servers (often critical ones) runs on Enscribe databases.