Greetings,

I am using Apache Jena 3.7.0 now and encounter the following issue so I would 
like to know how to solve it.

Background:

  *   We created our own sparql endpoint for using apache jena.
  *   Sometimes we need to clear data store and restore from new ttl file.
  *   For performance, we are using ram disk for TDB instead of SSD with our 
own reason.
  *   We thought that we have big enough memory for TDB

Issue

  *   Our application was just down because of full of ram disk
  *   Back then, we repeated to restore from new ttl files
  *   The number of TTL is 1.5 millions and file size is around 250MB
  *   Ramdisk size is 4 GB (first time when we restore it, ram disk used under 
1 GB)

Investigating

  *   I think nodes.dat is real data and looks like SPO.dat, POS.dat, OSP.dat 
looked didn't remove old data that I removed in my application.

Question

  *   Is there any way to keep same size between real data and TDB?
  *   We are using for removal with "Model.removeAll()" and "TDB.sync()"

Thanks
Daniel

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