[amibroker] multiple db as solutionfor slowness

[murthysuresh]

my charts were running slower in 1 minute resolution vs 5 minutes. it turns out 
that the culprit was the no of quotes that it was using. so i want to have 
multiple db each spanning 6 months each. any suggestions on how to export the 
data from the current db limiting each export with a start and end date of data.
for eg. 1 jan 2008-1 june 2008
1 june 2008- 1jan 2009