Ques: 1). What distinguishes a ledger database from other databases?
Since data may be overwritten or deleted in traditional databases, developers utilise strategies like audit tables and audit trails to help trace the history of the data. These strategies may be effective, but they call for specialised expertise, can be challenging to scale, and place the burden of data accuracy on the application developer. Since data in Amazon QLDB is written to an append-only journal, the developer has access to the complete data history. Additionally, the information in your ledger may be trusted because it is immutable and verifiable in the journal of Amazon QLDB.
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Ques: 2). Amazon Quantum Ledger Database: What Is It?
A comprehensive and cryptographically verifiable history of all modifications made to your application data is provided by the Amazon Quantum Ledger Database (QLDB), a specifically designed ledger database.
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Ques: 3). How fast can I anticipate Amazon QLDB to operate?
Compared to ledgers in typical blockchain systems, Amazon QLDB can process two to three times as many transactions. Due to the decentralised nature of blockchain systems, a majority of network participants must agree that a transaction is genuine before it can be carried out. However, QLDB's centralised architecture enables its transactions to be carried out without the need for multi-party consensus.
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Ques: 4). How robust is Amazon QLDB?
The ledger of Amazon QLDB is spread over several AZs with various copies in each AZ. When an availability zone fails, we maintain redundancy within the region and guarantee complete recovery. QLDB is strongly durable since a write is only recognised after being committed to a durable storage over many AZs.
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Ques: 5). What are QLDB Streams' ordering policies and delivery guarantees?
The Amazon QLDB Streaming feature offers a delivery
guarantee of at least once. A minimum of once is streamed to Amazon Kinesis for
each control, block summary, and revision details record that a QLDB Stream
creates from the journal. Customers will need deduplication logic on the
application layer if the application requires it since duplicate records may
occasionally emerge in the Kinesis stream. There are no promises regarding the
sequence in which prior blocks and changes will be released in the Kinesis
stream.
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Ques: 6). Is Amazon Quantum Ledger Database a blockchain or distributed ledger service?
There is no blockchain or distributed ledger system called Amazon QLDB. Blockchain and distributed ledger technologies are primarily used to address the issue of multi-party, decentralised systems that cannot be owned by a single body and in which the participants may not always have complete trust in one another. The QLDB ledger database, on the other hand, was created specifically for clients who needed to keep a comprehensive and verifiable history of data changes in a programme they owned. Along with the comfort, scalability, and simplicity of a fully maintained AWS database, Amazon QLDB delivers history, immutability, and verifiability. A blockchain solution can be suitable if your application demands decentralisation and includes several unreliable parties. Amazon QLDB is an excellent choice if your application needs a full and verifiable history of all application data changes but does not involve numerous, unreliable parties.
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Ques: 7). Does Amazon QLDB provide replication between regions?
As of right present, Amazon QLDB does not enable cross-region replication. Customers can export the contents of the QLDB journal to an S3 bucket using the export to S3 capability of QLDB. Cross-region replication may be set for the S3 buckets.
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Ques: 8). Does Amazon Virtual Private Cloud (Amazon VPC) allow the use of Amazon QLDB?
AWS Private Link and Amazon QLDB are linked. The ability to securely link a VPC to approved AWS services powered by PrivateLink without the need for an internet gateway, NAT device, VPN connection, or an AWS Direct Connect connection is provided by the ability for customers to build a VPC endpoint.
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Ques: 9). What are QLDB Streams' ordering policies and delivery guarantees?
The Amazon QLDB Streaming feature offers a delivery guarantee of at least once. A minimum of once is streamed to Amazon Kinesis for each control, block summary, and revision details record that a QLDB Stream creates from the journal. Customers will need deduplication logic on the application layer if the application requires it since duplicate records may occasionally emerge in the Kinesis stream. There are no promises regarding the sequence in which prior blocks and changes will be released in the Kinesis stream.
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Ques: 10). How do customers get started using Amazon QLDB Streaming Capability?
1/ Create an Amazon Kinesis Data Stream (KDS): Customers create a KDS stream either by using Amazon Kinesis console or AWS SDK. They can also use an existing stream.
2/ Create an Amazon QLDB Stream: Customers create an Amazon QLDB Stream using Amazon QLDB console or AWS SDK. The following key aspects need to be configured for creating the stream:
Amazon QLDB Ledger name
Target KDS stream
IAM role that Amazon QLDB will assume, which has permissions to write the KDS stream
Start time, that specifies the clock time from which to start streaming
End time, that specifies the clock time to end streaming. Omitting this optional parameter implies a continuous stream.
3/ Consume the KDS Stream: Customers can write Kinesis applications using Kinesis services, such as Kinesis Data Firehose and Kinesis Data Analytics, to consume and process the stream. Customers can also use AWS Lambda to consume the Kinesis Data Stream records.
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Ques: 11). How does Amazon QLDB handle authentication?
The same authentication process is used by Amazon QLDB and other AWS services. The method demands that HTTP requests have a request signature appended (header or query string). Other request data and the AWS credentials are used to calculate the signature (Access Key ID and Secret Access Key).
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Ques: 12). Can I create a backup or snapshot of my ledger?
As of right moment, Amazon QLDB does not provide a backup and restore functionality. Currently, there is a facility for exporting to S3. You may export the contents of your QLDB journal to S3 using this feature.
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Ques: 13). What information ought to be kept in a ledger database?
System-of-record applications, in which data quality, completeness, and verifiability are crucial, are a logical fit for Amazon QLDB's characteristics. An application built on Amazon QLDB, for instance, would have access to the whole history of changes, such as movement between carriers and across borders, for querying and analysis in the supply chain and logistics domain. System-of-record programmes in finance keep track of important data, such debit and credit transactions. Banks may utilise QLDB to quickly retain a permanent and comprehensive record of all financial transactions rather than developing sophisticated record keeping features within their application.
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Ques: 14). How can I test out Amazon QLDB?
Given that there are no servers to manage or capacity to deploy, getting started with Amazon QLDB is simple. The AWS Management Console, AWS Command Line Interface (CLI), an AWS CloudFormation template, or QLDB API calls may all be used to construct a new ledger in a matter of minutes.
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Ques: 15). Describe PartiQL. How is it supported by Amazon QLDB?
You may use PartiQL, a new open standard query language that offers SQL-compatible access to QLDB's document-oriented data architecture that incorporates semi-structured and nested data while being independent of any specific data source, to access and edit your data using Amazon QLDB.
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Ques: 16). What type of functionality is supported by Amazon QLDB?
Amazon QLDB offers a comprehensive and verifiable history of application data updates, as well as ACID-compliant transactions, a versatile document data type, and an API that is similar to SQL. Additionally, QLDB is completely managed and expands automatically to match the demands of your application without the need for provisioning.
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Ques: 17). How does Amazon QLDB's high availability function?
A very available service is Amazon QLDB. By default, a region's availability zones duplicate several copies of your QLDB ledger. So, even in the event of a zone failure, QLDB may still be used.
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Ques: 18). Where can I access Amazon QLDB in AWS?
With more regions in the way, Amazon QLDB is now accessible in the following AWS regions: US East (North Virginia, Ohio), US West (Oregon), Europe (Ireland, Frankfurt), and Asia Pacific (Singapore, Sydney, Seoul, and Tokyo).
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Ques: 19). How scalable is Amazon QLDB?
You won't need to worry about setting read and write limitations or allocating capacity while using Amazon QLDB. Your ledger and tables are defined, and QLDB scales itself automatically to meet your application's needs.
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Ques: 20). How does Amazon QLDB handle encryption?
All data, both in transit and at rest, is encrypted by default. Currently, customer controlled CMKs are not supported by Amazon QLDB (Customer Master Keys). Customer data is encrypted using AWS-owned keys by Amazon QLDB.
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