Unique IDs in Amazon QLDB - Amazon Quantum Ledger Database (Amazon QLDB)
PropertiesUsageExamples

Unique IDs in Amazon QLDB

Important

End of support notice: Existing customers will be able to use Amazon QLDB until end of support on 07/31/2025. For more details, see Migrate an Amazon QLDB Ledger to Amazon Aurora PostgreSQL.

This section describes the properties and usage guidelines of system-assigned unique identifiers in Amazon QLDB. It also provides some examples of QLDB unique IDs.

Properties

All system-assigned IDs in QLDB are universally unique identifiers (UUID). Each ID has the following properties:

  • 128-bit UUID number

  • Represented in Base62-encoded text

  • Fixed length alphanumeric string of 22 characters (for example: 3Qv67yjXEwB9SjmvkuG6Cp)

Usage

When using QLDB unique IDs in your application, note the following guidelines:

Do

  • Treat the ID as a string.

Don't

  • Try to decode the string.

  • Ascribe semantic meaning to the string (such as deriving a time component).

  • Sort the strings in a semantic order.

Examples

The following attributes are some examples of unique IDs in QLDB:

  • Document ID

  • Index ID

  • Strand ID

  • Table ID

  • Transaction ID