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document the --clear flag for imports

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Travis Turner 2018-10-22 17:05:18 -05:00
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docs/administration.md
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@ -82,6 +82,18 @@ For example, importing a file with the following contents will result in columns
<p>Note that you must first create a field. View <a href="../api-reference/#create-field">Create Field</a> for more details. The `-e` flag can create the necessary schema when using a field of type "set".</p>
</div>
#### Clearing Data via Import
By using the `--clear` flag with the import command, Pilosa will clear the values provided in the import payload.
For example, importing a file with the following contents along with the `--clear` flag will result in data being cleared from row 0, column 9; row 1, columns 2 and 8; and row 3, column 12. Clearing a value that doesn't exists is allowed.
```
0,9
1,2
1,8
3,12
```
#### Exporting
Exporting data to csv can be performed on a live instance of Pilosa. You need to specify the index and the field. The API also expects the shard number, but the `pilosa export` sub command will export all shards within a field. The data will be in csv format `Row,Column` and sorted by column.