Virtuoso: What happens when I get 'Checkpoint removed ** MB of remapped pages, leaving * MB' - sparql

Question

I am loading freebase files into virtuoso. I have 88 folders. Every folder contains 4 files. I divided the files such way because I only have 8 GB of RAM.
#!/bin/bash
for i in {1..88}
do
isql 1111 dba dba exec="ld_dir('/data/data/${i}', '*.nt', 'http://freebase.com');"
isql 1111 dba dba exec="rdf_loader_run();"
isql 1111 dba dba exec="checkpoint;"
isql 1111 dba dba exec="commit WORK;"
isql 1111 dba dba exec="checkpoint;"
isql 1111 dba dba exec="delete from DB.DBA.load_list;"
done
Virtuoso.ini
# each buffer caches a 8K page of data and occupies approx. 8700 bytes of memory
# it's suggested to set this value to 65 % of ram for a db only server
# so if you have 32 GB of ram: 32*1000^3*0.65/8700 = 2390804
# default is 2000 which will use 16 MB ram
[Database]
MaxCheckpointRemap = 150000 (I have 8GB of RAM)
[TempDatabase]
MaxCheckpointRemap = 2000
NumberOfBuffers = 170000
MaxDirtyBuffers = 130000
Message
Checkpoint removed 628 MB of remapped pages, leaving 31 MB. Duration 31.21 s. To save this time, increase MaxCheckpointRemap and/or set Unremap quota to 0 in ini file.
Question
Why am I getting this message? and does it affect the loading process and building of the database?
update
#!/bin/bash
#clear list
isql 1111 dba dba exec="delete from DB.DBA.load_list;"
#load data
isql 1111 dba dba exec="ld_dir('/data/data, '*.gz', 'http://freebase.com');"
isql 1111 dba dba exec="set isolation='uncommitted';"
isql 1111 dba dba exec="rdf_loader_run();"
#checkpoint
isql 1111 dba dba exec="checkpoint;"
isql 1111 dba dba exec="commit WORK;"
isql 1111 dba dba exec="checkpoint;"
virtuoso.ini
MaxCheckpointRemap = 150000 (8GB RAM)
# Uncomment next two lines if there is 4 GB system memory free
NumberOfBuffers = 340000
MaxDirtyBuffers = 250000
# I have 6 cores
ThreadsPerQuery = 4
AsyncQueueMaxThreads = 10
#NO THREADS LEFT IN THE QUEUE
ThreadCleanupInterval = 0
ThreadThreshold = 0
#check point every 30 minutes.
CheckpointInterval = 30

Answer 1

It's best explained in the virtuoso docs, but in short:
The MaxCheckpointRemap parameter in the virtuoso.ini file controls how
many pages may be stored on a page other than their logical page.
This means that increasing the parameter will save you work (and time) on a checkpoint but reduces the data locality feature (data that is inserted together is saved close together).