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Get data from Amazon S3

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In this article, you learn how to get data from Amazon S3 into either a new or existing table. Amazon S3 is an object storage service built to store and retrieve data.

For more information on Amazon S3, see What is Amazon S3?.

Prerequisites

Source

  1. On the lower ribbon of your KQL database, select Get Data.

    In the Get data window, the Source tab is selected.

  2. Select the data source from the available list. In this example, you're ingesting data from Amazon S3.

    Screenshot of get data window with source tab selected.

Configure

  1. Select a target table. If you want to ingest data into a new table, select +New table and enter a table name.

    Note

    Table names can be up to 1024 characters including spaces, alphanumeric, hyphens, and underscores. Special characters aren't supported.

  2. In the URI field, paste the connection string of a single bucket, or an individual object in the following format.

    Bucket: https://BucketName.s3.RegionName.amazonaws.com;AwsCredentials=AwsAccessID,AwsSecretKey

    Optionally, you can apply bucket filters to filter data according to a specific file extension.

    Screenshot of configure tab with new table entered and an Amazon S3 connection string pasted.

  3. Select Next.

Inspect

The Inspect tab opens with a preview of the data.

To complete the ingestion process, select Finish.

Screenshot of the inspect tab.

Optionally:

Edit columns

Note

  • For tabular formats (CSV, TSV, PSV), you can't map a column twice. To map to an existing column, first delete the new column.
  • You can't change an existing column type. If you try to map to a column having a different format, you may end up with empty columns.

The changes you can make in a table depend on the following parameters:

  • Table type is new or existing
  • Mapping type is new or existing
Table type Mapping type Available adjustments
New table New mapping Rename column, change data type, change data source, mapping transformation, add column, delete column
Existing table New mapping Add column (on which you can then change data type, rename, and update)
Existing table Existing mapping none

Screenshot of columns open for editing.

Mapping transformations

Some data format mappings (Parquet, JSON, and Avro) support simple ingest-time transformations. To apply mapping transformations, create or update a column in the Edit columns window.

Mapping transformations can be performed on a column of type string or datetime, with the source having data type int or long. Supported mapping transformations are:

  • DateTimeFromUnixSeconds
  • DateTimeFromUnixMilliseconds
  • DateTimeFromUnixMicroseconds
  • DateTimeFromUnixNanoseconds

Advanced options based on data type

Tabular (CSV, TSV, PSV):

  • If you're ingesting tabular formats in an existing table, you can select Advanced > Keep table schema. Tabular data doesn't necessarily include the column names that are used to map source data to the existing columns. When this option is checked, mapping is done by-order, and the table schema remains the same. If this option is unchecked, new columns are created for incoming data, regardless of data structure.

  • To use the first row as column names, select Advanced > First row is column header.

    Screenshot of advanced CSV options.

JSON:

  • To determine column division of JSON data, select Advanced > Nested levels, from 1 to 100.

  • If you select Advanced > Skip JSON lines with errors, the data is ingested in JSON format. If you leave this check box unselected, the data is ingested in multijson format.

    Screenshot of advanced JSON options.

Summary

In the Data preparation window, all three steps are marked with green check marks when data ingestion finishes successfully. You can select a card to query, drop the ingested data, or see a dashboard of your ingestion summary.

Screenshot of summary page with successful ingestion completed.

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