Preliminary results, float data only, no deletions:

MySQL with default driver configuration:
401MB database (100% data file utilization) and 16.75 minutes

with rewriteBatchedStatements=true:
401MB database (100% data file utilization) and 201 seconds (3.35 minutes)

RealDB:
200MB database, 49.31% utilization, 126 seconds (2.1 minutes)

Derby:
1.06GB database, 3857 seconds (64.28 minutes)

AData 2GB SD card "Turbo 150X"
# dd if=sdbackup.bin of=/dev/sdc bs=4096
499328+0 records in
499328+0 records out
2045247488 bytes (2.0 GB) copied, 328.377 s, 6.2 MB/s

386140+0 records out
1581629440 bytes (1.6 GB) copied, 82.5909 s, 19.2 MB/s
# kill -USR1 $pid
499328+0 records in
499328+0 records out
2045247488 bytes (2.0 GB) copied, 110.978 s, 18.4 MB/s

partitions:
1 0.5G unformatted
2 1.5G fat32

Sandisk 4GB CF Card "15 MB/sec"
Really old generic brand USB card reader "ALLIN1"
# dd if=sdbackup.bin of=/dev/sdc bs=4096 count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 7.23612 s, 5.7 MB/s

# dd if=/dev/sdc of=/dev/null bs=4096 count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 6.03095 s, 6.8 MB/s

partitions:
1 0.5G unformatted
2 3.5G fat32
