Decoder/Concetrator Core database space may underuitlized due to default percent value change in recent versions.

[SravanKoneti1]

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

https://community.rsa.com/docs/DOC-83215
https://community.rsa.com/docs/DOC-53023

When correcting this settings, Please use reconfig percent=95 update=1 parameters. This may help to use 95% utilization as recommended.

Reference:https://community.rsa.com/community/products/netwitness/blog/2017/04/26/how-to-prevent-stopping-capture-on-a-default-settings-log-decoder-due-to-less-metadb-size 

[ScottMoore1]

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.