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ECS 3.6.2 Data Access Guide

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Object Tagging

Object Tagging allows you to categorize the objects by assigning tags to the individual objects. A single object can have multiple tags that are associated with it, enabling multidimensional categorization.

A tag could describe some sort of sensitive information like a health record, or you can tag an object. to a certain product that can be categorized as confidential. Tagging is a subresource of an object that has a life-cycle, integrated with object operations. You can add tags to new objects when you upload them, or add tags to existing objects. It is acceptable to use tags to label objects containing confidential data, such as Personally Identifiable Information (PII) or Protected Health Information (PHI). The tags must not contain any confidential information, as tags can be viewed without having the read permission to an object.
WARNING: Object Tagging does not support file system-enabled buckets with S3 protocol.

Two parameters are available in ECS Object Tagging:

Tag
A tag is a key-value pair where both the key and the value are represented as a string.
Tag set
A set of tags associated with an object. Tags that are associated with an object must have unique tag keys. You can associate up to 10 tags with an object. However, the additional storage overhead is about 4 kb in UTF-8 and sixteen kb in UTF-32.
NOTE:
  • A single tag would require about 384 bytes on disk if stored in UTF-8 encoding or about 1.5 kb if stored as UTF-32.
  • Allowed characters are letters, numbers, and spaces representable in UTF-8, and the following characters: + - = . _ : / @
  • A tag key can be up to 128 Unicode characters in length, and tag values can be up to 256 Unicode characters in length.
  • The key and values are case-sensitive.
  • Object Tagging API support is available from ECS 3.5 and later versions. For more information about Object Tagging APIs, see Manage Object Tagging.

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