[amibroker] Database/preference setting questions

["itmwh" <toxutao@xxxxxxxx>]

Hi, I have two questions regarding setting of Amibroker:

1--In database setting 

In the control of "number of bars to load", if I fill in 30,000 bars, 
and my data source is Interactive Brokers,it is Ok for my day-to-day 
trading, but when I do researchs afterwards,  will this number (30000)  
make it impossible for me to backtest on a symbol with 70,000 bars ?  
And what is the general suggestion for deciding how big a number I 
should fill in this database setting window ? 

2--In preference setting

In "Data" tab,  "In-memory cache (max. MegaBytes) ",   what is the 
general suggestion for deciding how big a number I should fill in here ?


Kind Regards/ itmwh



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