Turns an IP address back into a host name. These records live in reverse lookup zones.
Also called pointer.
Read more: Microsoft Learn
In the Ultra Transcenders books
Each book explains PTR in context, with comparison tables and the common traps.
Terms in this definition
- LOOKUP
Inside a visual calculation, this DAX function retrieves a value from the visual matrix using whatever filters you supply, and works out any you omit from the context it is evaluated in.
Related terms
- Data asset
In Azure Machine Learning, a versioned, named pointer to a storage location (
uri_file,uri_folderormltable) that behaves like a bookmark, leaving the data where it is rather than copying it. - Datastore
A named pointer in the workspace to Blob, Azure Files or ADLS Gen2 storage that keeps the connection details, so code never needs to carry storage keys itself.
- Git LFS
Git Large File Storage, an extension that keeps small pointer files in the repository while big binaries live elsewhere, and offers locking for files that cannot be diffed. Azure Repos supports it at no charge, but not over SSH.
- OneLake shortcut
A pointer in Microsoft Fabric that surfaces external data inside OneLake without making a copy.
- Row-overflow storage
Once a row would exceed 8,060 bytes, variable-length columns are pushed off-row and a 24-byte pointer takes their place in the main record; reading those columns then costs extra I/O.