Two Virtual System Tables (VSTs) exist to record activity for LOB actions. These tables are _LobStat and _UserLobStat.

The size and base of the _LobStat and _UserLobStat VSTs are controlled by four startup parameters: -baselob, -lobrangesize, -baseuserlob, -userlobrangesize. The -base*lob startup parameters are modifiable at runtime by changing the value in the _DbParams VST corresponding to the parameter.