Decoder/Concetrator Core database space may underuitlized due to default percent value change in recent versions.
In earlier versions, Core database (packetdb/sessiondb/metabd and indexdb) settings were corrected by reconfig update=1 parameters to bring 95% space utilization. However, the latest versions will not bring the to 95% with this parameters. Since default percent was reduced from 95 to 90 percent now.
This is from recent 10.6.4.2: default percent=90
In earlier versions:default percent=95
When correcting this settings, Please use reconfig percent=95 update=1 parameters. This may help to use 95% utilization as recommended.
The index should use 90%, which is what you are seeing in the help. The other databases (session, meta, packet) are 95%. I would not change the index to anything higher than 90%. These defaults have not changed.