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Questions tagged [amazon-qldb]

Amazon Quantum Ledger Database (Amazon QLDB) is a fully managed ledger database owned by a central trusted authority that provides a transparent, immutable, and cryptographically verifiable transaction log of all of your application changes. Amazon QLDB tracks all application data changes and maintains a complete and verifiable history of changes over time.

What Is Amazon QLDB? - Amazon Quantum Ledger Database (Amazon QLDB)

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Amazon QLDB have any scaling/performance limits?

The main Amazon QLDB page says QLDB is also serverless, so it automatically scales to support the demands of your application. However, even products like DynamoDB—with practically unbounded automatic scaling—have some scaling limits. (For…
Matthew Pope
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How to get/compute CommitDigest when committing a transaction in AWS QLDB?

I've been reading through the docs trying to figure out how to commit a transaction in QLDB, and in order to do so, a CommitDigest is required, and the docs describe it as: Specifies the commit digest for the transaction to commit. For every active…
Mike Richards
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Pagination in QLDB

I noticed QLDB does not support LIMIT or SKIP query parameters required to implement basic pagination. Is this going to be supported in the future or is there some other way to implement pagination in QLDB?
Alko
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Limit statement in PartiQL - Get Last row

How do I use Limit in PartiQL? What I need is the last 3 rows from the table of Amazon QLDB which uses PartiQL Syntax for querying. Something like SELECT * FROM Accounts where AddedBy = 'admin@demo.com' LIMIT 3
Malik Hanzala
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QLDB high latency of ~5000ms

I am using the "aws-sdk:^2.576.0" and "amazon-qldb-driver-nodejs:0.1.0-preview.2", and following the node-sdk's sample code for qldb. I am calling the node-sdk functions via the REST APIs exposed. So for the read table operation, i.e., SELECT *…
PrashantNagawade
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Extracting "data" from Amazon Ion file

Has anyone worked with the Amazon Quantum Ledger Database (QLDB) Amazon ion files? If so, do you know how to extract the "data" part to formulate tables? Maybe use python to scrape the data? I am trying to get the "data" information from these files…
Nosiphiwe Duma
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QLDB unique field

I want to create a unique field in QLDB. I tried to use UNIQUE, but get: unexpected token found, KEYWORD : unique; Unexpected token following CREATE
Alko
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Find the history of Deleted Data in QLDB

I have created Vehicle Table In the Ledger and added some vehicles in QLDB and I deleted the vehicle data.Now I am not able to fetch the metadata id because user table and committed table will have only non-deleted latest version of application…
Sanjeev Kumar
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Key differences between Amazon Managed Blockchain and Quantum Ledger Database (QLDB)?

What are the key differences between Amazon Managed Blockchain and Amazon QLDB ? Under which scenarios is it advisable to use which service for distributed ledgers and when ? How can the performance vary between the two services in terms of no of…
asing177
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How to verify a document from QLDB in Node.js?

I'm trying to verify a document from QLDB using nodejs. I have been following the Java verification example as much as I can, but I'm unable to calculate the same digest as stored on the ledger. This is the code I have come up with. I query the…
Alko
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How to mock AWS QLDB in Node js

I want to do Jest test cases on QLDB to be covered my code lines as much I can. is there any way to do QLDB mock with our code covered ( Jest )
Hanoj B
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How to get records in descending order in QLDB?

Select * from Transactions where id='123' I am trying to get transactions in descending order . But order by is not working here .
Aman Mate
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Using GROUP BY in AWS QLDB / Partiql

I have the following table in my AWS QLDB table: INSERT INTO Testing << { 'MyId': 1, 'MyList': [ 'Item1', 'Item2', 'Item3'] }, { 'MyId': 2, 'MyList': [ 'Item2', 'Item3', 'Item4'] }, { 'MyId': 3, 'MyList': [ 'Item4', 'Item5',…
David
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QLDB query via Lambda

I'm trying to access AWS QLDB via API gateway and a Lambda expression but can't find any documentation on it, can anyone tell me if this is possible? The plan is for an open API so that it is language agnostic but all I can find is reference to…
10PinT
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Can we archive the AWS QLDB data, as every business have limitations on amount of history that can be stored

I was looking at AWS QLDB service to store the audit trail history of changes that were made to our application, so that it can be immutable. But, at the end it is a database & we can't just keep on adding data (storing such large amount of data is…
Srujal Kachhela
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