Topic: What DB to select?
Is 50 the text information (csv - a format). For acceleration of reversal I overtook it in binary files (fulfilling conversions from the text in the necessary data types), receiving 33 . As a result speed of reading increased in 50/33 times, i.e. a bottleneck is not necessity to strain the processor for conversion from the text, but only operation with a hard disk.
In a binary format the data stores all fields (in structures), and all fields are read also. Therefore there was a thought to use a DB, not to read superfluous fields (and conversion from DB sampling in the necessary objects most likely as well as in the previous case practically will not decelerate operation).
What DB advise at similar volume? Whether approach for this purpose dbf - files (or they too are read entirely)? While criterion one - maximum speed.