To reduce unwanted data from being logged in the database, disable data collection for individual data loaders.
For EGO data loaders, edit EGO_TOP/perf/conf/plc/plc_ego.xml.
For Symphony data loaders, edit EGO_TOP/perf/conf/plc/plc_soam.xml.
<DataLoader Name="egodynamicresloader" ... Enable="true" .../>
<DataLoader Name="egodynamicresloader" ... Enable="false" ... />