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It's possible that during a MultiCharts operation that the Internet connection and/or connection to a real-time data provider from your PC is lost. In such situations the missing data can be backfilled by MultiCharts:*On [[Tick, Minute and Daily Data|tick based and minute based]] charts, the gaps are backfilled at once after the connection is restored.*On [[Tick, Minute and Daily Data|minute based]] charts, the gaps are not backfilled at once. The gaps are backfilled during a next historical data request (copy/paste chart, close/open workspace).
'''“Backfilled at once” means that after a physical connection recovery:'''
* A reconnection event is determined (a corresponding message appears in QuoteManager Event Log);
* Missing data is requested from the data vendor's historical data servers;
* Missing bars appear on the chart;
* Realtime bars appear after backfilled bars;
* The studies are not recalculated, they are calculated the regular way on the backfilled bars;
* Orders If there are any orders generated on the backfilled data and if the auto trading is enabled - they are not sent to the broker.
'''Backfilling Availability.'''
Data vendors list (realtime only/historical only data vendors are not listed):
* BarChart - Available
* CQG - Available
* TradeStation - Not Available *
* WeBank - Not Available *
'''*Not Available''' means that the data vendor provides historical data but does not provide the ability to determine a yconnection the connection loss/reconnection event through its API. Such data vendors are being contacted for clarifications.
[[Category:FAQHelp]]