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Asset contents or previews

Asset contents or previews

In projects and other workspaces, you can see a preview of data assets that contain relational data.

Requirements and restrictions

You can view the contents or previews of assets under the following conditions and restrictions.

You can view the preview or contents of assets in these workspaces:
  • Projects
  • Deployment spaces

Types of assets
  • Data assets from files
  • Connected data assets
  • Models
  • Notebooks

Required permissions
To see the asset contents or preview, these conditions must be true:
  • You have any collaborator role in the workspace.
Restrictions for data assets
Additional requirements apply to connected data assets and data assets from files. See Requirements for data assets.
Previews are not available for data assets that were added as managed assets by using the Watson Data API.

Previews of data assets

The previews of data assets show a view of the data.

You can see when the data in the preview was last fetched and refresh the preview data by clicking the refresh icon.

Requirements for data assets

The additional requirements for viewing previews of data assets depend on whether the data is accessed through a connection or from a file.

Connected data assets
You can see previews of data assets that are accessed through a connection if all these conditions are true:
  • You have access to the data asset and its associated connection. See Requirements and restrictions.

  • The data asset contains structured data. Structured data resides in fixed fields within a record or file, for example, relational database data or spreadsheets.

  • You have credentials for the connection:

    • For connections with shared credentials, the username in the connection details has access to the object at the data source.
    • For connections with personal credentials, you must enter your personal credentials when you see a key icon (the key symbol for private connections). This is a one-time step that permanently unlocks the connection for you. See Adding connections to projects.
Data assets from files
You can see previews of data assets from files if the following conditions are true:

Preview information for data assets

For structured data, the preview displays a limited number of rows and columns:

  • The number of rows in the preview is limited to 1,000.
  • The amount of data is limited to 800 KB. The more columns the data asset has, the fewer rows that appear in the preview.

Previews show different information for different types of data assets and files:

Supported types: Relational data, CSV, TSV, Avro, partitioned data, and Parquet (projects).
Not supported: Assets from file based connections like Apache Kafka and Apache Cassandra.
The preview shows column names, data types, and a subset of columns and rows of data.
Supported: Text, JSON, HTML, PDF, images, and Microsoft Excel documents. Unstructured data files must be stored in IBM Cloud Object Storage.
The preview shows the whole document. HTML files are supported in text format. Images stored in IBM Cloud Object Storage support JPG, JPEG, PNG, GIF, BMP, and BMP1. Microsoft Excel document previews show the first sheet.
Connected folder assets
The preview shows the files and subfolders, which you can also preview.

File extensions and mime types of previewed files

These types of files that contain structured data have previews:

Structured data files
Extension Mime type
CSV text/csv
CSV1 application/csv
JSON application/json
TXT text/plain
XLSX application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
XLS application/vnd.ms-excel
XLSM application/vnd.ms-excel.sheet.macroEnabled.12

These types of image files have previews:
Image files
Extension Mime type
BMP image/bmp
GIF image/gif
JPG image/jpeg
JPEG image/jpeg
PNG image/png

These types of document files have previews:
Document files
Extension Mime type
HTML text/html
PDF application/pdf
TXT text/plain

Learn more

Parent topic: Asset types and properties

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