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[amibroker] Is database limited by the number of bars in database setting?



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it's a intraday 1 minute database with IB datafeed, the number of bars 
in database setting is 30,000, I noticed that the database is limited 
to 30000 bars no matter how long I have accumulated data, my purpose is 
to accumulate more than six months data for backtesting, but seems I 
keep loosing old data as time goes by.

what is the solution? should I make the number of bars bigger, say 
500,000? will it affect the performance of AB for my intraday trading?

thanks




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