Oracle and Access are both RDBMS's (Relational Database Management Systems).
Consequently they both use tables which have 'keys' to retrieve rows, and use 'foreign keys' to other tables to 'relate'...
The decibel scale is a logarithmic scale where each change in three dB represents a power factor change of two. (3 dB is power times two, 6 dB is power times four, 9 dB is power times 8, etc....