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Merge pull request #9217 from freqtrade/frog-dataformat-docs-1

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Update data-download.md
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@ -154,13 +154,13 @@ freqtrade download-data --exchange binance --pairs ETH/USDT XRP/USDT BTC/USDT --
Freqtrade currently supports the following data-formats:
* `feather` - a dataformat based on Apache Arrow
* `json` - plain "text" json files
* `jsongz` - a gzip-zipped version of json files
* `hdf5` - a high performance datastore
* `feather` - a dataformat based on Apache Arrow
* `parquet` - columnar datastore (OHLCV only)
By default, OHLCV data is stored as `json` data, while trades data is stored as `jsongz` data.
By default, both OHLCV data and trades data are stored in the `feather` format.
This can be changed via the `--data-format-ohlcv` and `--data-format-trades` command line arguments respectively.
To persist this change, you should also add the following snippet to your configuration, so you don't have to insert the above arguments each time:
@ -203,15 +203,15 @@ time freqtrade list-data --show-timerange --data-format-ohlcv <dataformat>
| Format | Size | timing |
|------------|-------------|-------------|
| `feather` | 72Mb | 3.5s |
| `json` | 149Mb | 25.6s |
| `jsongz` | 39Mb | 27s |
| `hdf5` | 145Mb | 3.9s |
| `feather` | 72Mb | 3.5s |
| `parquet` | 83Mb | 3.8s |
Size has been taken from the BTC/USDT 1m spot combination for the timerange specified above.
To have a best performance/size mix, we recommend the use of either feather or parquet.
To have a best performance/size mix, we recommend using the default feather format, or parquet.
### Pairs file