Using DAB caching for UDS/SQL

Software caching (DAB) is useful for database operation. For reasons of data safety, it is essential to avoid write-buffering or write/read-buffering in volatile cache media (main memory, expanded memory).

This applies both to the database files and the session and logging files. The UDS/SQL safety concept (see section “The UDS/SQL recovery concept”) assumes that if a write operation is logically concluded then it is also physically concluded and will therefore survive a system crash, for example due to a power failure.

For a detailed description of DAB caching, see the manual "DAB (BS2000)".