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 . This is a one-time step that
permanently unlocks the connection for you. See Adding connections to projects.
Data assets from files
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You can see previews of data assets from files if the following conditions are true:
The file is stored in IBM Cloud Object Storage. For preview of text or image files from an IBM Cloud Object Storage connection to work, the connection credentials must include an access key and a secret key. If you’re using an existing
Cloud Object Storage connection that doesn’t have these keys, edit the connection asset and add them. See IBM Cloud Object Storage connection.
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.
Structured data
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For structured data, the preview shows column names, a subset of columns and rows of data. The supported formats for structured data include relational data, CSV, TSV, Avro, Microsoft Excel documents, and partitioned Parquet data (for IBM
Cloud Object Storage and S3 connections). Microsoft Excel documents show the first sheet.
Assets from file based connections like Apache Kafka and Apache Cassandra are not supported.
Unstructured data
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Unstructured data files must be stored in IBM Cloud Object Storage to have previews.
For these unstructured data files, the preview shows the whole document: Text, JSON, HTML, PDF, and images. HTML files are supported in text format. Images stored in IBM Cloud Object Storage support JPG, JPEG, PNG, GIF, BMP, and BMP1.
For connected folder assets, the preview shows the files and subfolders, which you can also preview.
File extensions and mime types of previewed files
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These types of files that contain structured data have previews: