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saratur
2011-01-27 15:49:17
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What is the exact behaviour of a Downloader for the four combinations of check/uncheck for
"remove old data"
and
"replace same data" ?
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QuantShare
2011-01-28 05:04:38
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Imagine your are downloading EOD data for Google:
"remove old data" instructs the application to remove Google EOD data before adding the new data
"replace same data" instructs the application to replace data for the same dates
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saratur
2011-01-28 05:23:08
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Sorry I am not clear on what exactly this means.
- "replace same data" - this would be for the start to end dates, correct?
- "remove old data" - if this relates to the start to end date range it seems this will be same as replace; so is it removing all the data for GOOG, including for dates outside of the range?
- what happens when none of these tow boxes is checked? does updates only dates where there was no earlier data?
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QuantShare
2011-01-28 06:10:30
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Best Answer
Example:
Current Goog data: (In the database)
01/01/2010;601.2;601.3
02/01/2010;601.2;601.3
Downloaded Goog data: (From the Internet)
02/01/2010;601.2;601.4
03/01/2010;601.2;601.3
If "remove old data" is checked then the application removes all Goog data before adding the new data (Including data outside the range).
If "replace same data" is checked then the first line (02/01/2010) will be updated (because it already exists) and (03/01/2010) will be added
Result:
01/01/2010;601.2;601.3
02/01/2010;601.2;601.4
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Joshua Laferriere
2019-07-30 21:50:32
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will it always replace data or only if there is an updated #?
What if I want to keep my downloads to a minimum. I don't understand if it's cleaning bad data or simply re-acquiring the same data.
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QuantShare
2019-07-31 11:16:39
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It will always replace data if same date/time is detected.
It will not remove any other data unless "remove old data" is selected and in this case, all the data is removed first then only the new data will appear.
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