CCI 2019 - Come ottimizzare i propri workload su Azurewalk2talk srl
Spostare i propri workload su Azure può sembrare la strada più rapida per migliorare la disponibilità dei propri servizi e ridurne il costo, ma chi ha intrapreso questa scelta ha dovuto fronteggiare una realtà non sempre in linea con le aspettative.
Eppure, cambiando le regole del gioco, è possibile raggiungere questi obiettivi. In questa sessione, frutto dell’esperienza di cinque anni di lavoro con workload in produzione su Azure, scopriremo come sia possibile raggiungere gli obiettivi di disponibilità ed economicità sfruttando tutti gli strumenti che Microsoft Azure mette a disposizione.
By Daniele Grandini
Using event sourcing (backed by Azure table storage) as a persistence mechanism to store durable state for azure functions and using Event Grid to communicate between them
When it comes to managing the security of your AWS environment, traditional, on-premise, perimeter-only tactics must evolve to be environment-aware, data-centric, and automated wherever possible.
Speed of detection and agility in recovery are your new challenges and AWS Config, Cloudwatch, and Lambda are your new allies that help address them.
Learn about high-speed security incident response and recovery at the push of a button perhaps. This talk provides an overview with detailed examples of configuration management, event notification, and automatic execution to rapidly detect and react to potential security concerns within your AWS environment.
Speaker: Don Bailey, Principal Security Engineer, Amazon Web Services & Joshua Du Lac, Senior Security Consultant, Amazon Web Services
Azure Day Rome Reloaded 2019 - Reactive Systems with Event Gridazuredayit
Event Grid Può essere usato in modo estremamente pervasivo e versatile per costruire architetture serverless reattive, ad esempio nel mondo IoT delle Smart Things, a costo “quasi zero”. Con Event GRid è possibile creare sistemi potenzialmente giganteschi (e impossibili da ricreare on premises), che si autogovernano, espandono (e cambiano!!!) sulla base delle logiche di campo.
Azure IoT - A Practical Entry to New RetailDaniel Li
New Retail is in fact a paramount horizontal integration to connect consumers to manufacturers of highly personalized products. It's firstly brought up by Alibaba and is rapidly put in actions in tier 1 retailers. How retailers, retail device manufacturers to take practical actions to embrace the sea change. The presentation offers the hint with Azure IoT
CCI 2019 - Come ottimizzare i propri workload su Azurewalk2talk srl
Spostare i propri workload su Azure può sembrare la strada più rapida per migliorare la disponibilità dei propri servizi e ridurne il costo, ma chi ha intrapreso questa scelta ha dovuto fronteggiare una realtà non sempre in linea con le aspettative.
Eppure, cambiando le regole del gioco, è possibile raggiungere questi obiettivi. In questa sessione, frutto dell’esperienza di cinque anni di lavoro con workload in produzione su Azure, scopriremo come sia possibile raggiungere gli obiettivi di disponibilità ed economicità sfruttando tutti gli strumenti che Microsoft Azure mette a disposizione.
By Daniele Grandini
Using event sourcing (backed by Azure table storage) as a persistence mechanism to store durable state for azure functions and using Event Grid to communicate between them
When it comes to managing the security of your AWS environment, traditional, on-premise, perimeter-only tactics must evolve to be environment-aware, data-centric, and automated wherever possible.
Speed of detection and agility in recovery are your new challenges and AWS Config, Cloudwatch, and Lambda are your new allies that help address them.
Learn about high-speed security incident response and recovery at the push of a button perhaps. This talk provides an overview with detailed examples of configuration management, event notification, and automatic execution to rapidly detect and react to potential security concerns within your AWS environment.
Speaker: Don Bailey, Principal Security Engineer, Amazon Web Services & Joshua Du Lac, Senior Security Consultant, Amazon Web Services
Azure Day Rome Reloaded 2019 - Reactive Systems with Event Gridazuredayit
Event Grid Può essere usato in modo estremamente pervasivo e versatile per costruire architetture serverless reattive, ad esempio nel mondo IoT delle Smart Things, a costo “quasi zero”. Con Event GRid è possibile creare sistemi potenzialmente giganteschi (e impossibili da ricreare on premises), che si autogovernano, espandono (e cambiano!!!) sulla base delle logiche di campo.
Azure IoT - A Practical Entry to New RetailDaniel Li
New Retail is in fact a paramount horizontal integration to connect consumers to manufacturers of highly personalized products. It's firstly brought up by Alibaba and is rapidly put in actions in tier 1 retailers. How retailers, retail device manufacturers to take practical actions to embrace the sea change. The presentation offers the hint with Azure IoT
Power Platform24: Essential Azure for Dynamics 365 ProfessionalsAli Khan
As many of the solutions developed in D365 are hybrid (multiple first-party apps, use Power Apps app, PCF etc) and integration is becoming more pervasive (thanks to 100s of connectors), I talked about “Essential Azure for Dynamics 365 professionals” in #Power24 event last week. Here is the video and accompanying slide deck.
We looked at a few problem statements (common challenges in D365 projects) and how Azure products can help in an easy and often no-code-low-code way.
Key takeaways (if you haven’t worked on Azure before) is that:
> Azure is big (highly likely you will find a product-fit for any problem you are looking for)
> Azure is approachable
> Azure provides no-code solutions too!
Write retrogames in the web and add something more with AzureMarco Parenzan
Mi piacciono i retrogames, sin da quando ho iniziato a usare i computer con il mio amato Commodore 64 negli anni ottanta. Così nel mio (poco) tempo libero cerco di reimplementare, non come sviluppatore professionista, i giochi più semplici e coinvolgenti con cui ho giocato, portandoli sul web con JavaScript e Phaser.io. Quindi voglio condividere la mia esperienza.
Poi, dato che lavoro con Azure e i giochi diventano delle Web App, cerco di evolvere i giochi aggiungendo alcune nuove e moderne funzionalità, così per sperimentare un po' i vari servizi di Azure, soprattutto quelli che normalmente uso meno.
Experts Live Norway - Azure Infrastructure SecurityTom Janetscheck
In today's cloud era, admins struggle to keep their IT infrastructures safe. Cloud security is joint responsibility and what we need is a new approach!
In this session, you will learn how to securely deploy and maintain Azure infrastructure solutions, why automation is essential, what network security and encryption options you have, and how access control can prevent you from having sleepless nights.
We will successfully attack an Azure environment live on stage, dive deep into Azure Security Center, and see how we can use it to ultimately secure IT infrastructures on premises, hybrid, and on Azure.
AWS re:Invent 2016: Automating Security Event Response, from Idea to Code to ...Amazon Web Services
With security-relevant services such as AWS Config, VPC Flow Logs, Amazon CloudWatch Events, and AWS Lambda, you now have the ability to programmatically wrangle security events that may occur within your AWS environment, including prevention, detection, response, and remediation. This session covers the process of automating security event response with various AWS building blocks, taking several ideas from drawing board to code, and gaining confidence in your coverage by proactively testing security monitoring and response effectiveness before anyone else does.
How Level Infinite Implemented CQRS and Event Sourcing on Top of Apache Pulsa...ScyllaDB
A use-case study of why Tencent uses ScyllaDB as the state store of our Proxima Beta gaming platform's service architecture. How we leverage multi-datacenter replication for global data distribution and governance, as well as time window compaction strategy (TWCS) to power a distributed queue-like event store specialized to our scenario.
The systems administrator role is perhaps one of the oldest in computer technology. However in this modern cloud computing world some of them will evolve into Cloud Administrators. As for those admins? It could be a case of how more things change, the more they stay the same. In their new role as an Azure Administrator they will be responsible for implementing, monitoring and maintaining Azure resources and use a complete new skill set. In this session you will learn 7 habits every new Azure admin must have. You will not only learn about Azure Cost Management, and Azure Governance, but also which tools you can use to connect securely to your Azure resources. So join us in this session to learn some tips, tricks and things you should keep in mind in this new job role.
This Cloud Computing presentation will help you understand why Cloud Computing has become so popular, what is Cloud Computing, types of Cloud Computing, Cloud providers, the lifecycle of a Cloud Computing solution and finally a demo on AWS EC2 and AWS S3. With the increased importance of Cloud Computing, qualified Cloud solutions architects and engineers are in great demand. Organizations have moved to cloud platforms for better scalability, mobility, and security. In simple words, cloud computing is the use of a network of remote servers hosted on the internet to store, manage and process data rather than a local server. With the increased importance of Cloud Computing, qualified Cloud solutions architects and engineers are in great demand. This presentation explains to you why we need cloud computing and why it has got so much importance in the current market.
Below topics are explained in this Cloud Computing presentation:
1. Why cloud computing?
2. What is cloud computing?
3. Types of cloud computing?
4. Cloud providers
5. The lifecycle of a cloud computing solution
6. Cloud computing with AWS
7. Demo - AWS EC2 and AWS S3
Simplilearn’s Cloud Architect Master’s Program will build your Amazon Web Services (AWS) and Microsoft Azure cloud expertise from the ground up. You’ll learn to master the architectural principles and services of two of the top cloud platforms, design and deploy highly scalable, fault-tolerant applications and develop skills to transform yourself into an AWS and Azure cloud architect.
Why become a Cloud Architect?
With the increasing focus on cloud computing and infrastructure over the last several years, cloud architects are in great demand worldwide. Many organizations have moved to cloud platforms for better scalability, mobility, and security, and cloud solutions architects are among the highest paid professionals in the IT industry.
According to a study by Goldman Sachs, cloud computing is one of the top three initiatives planned by IT executives as they make cloud infrastructure an integral part of their organizations. According to Forbes, enterprise IT architects with cloud computing expertise are earning a median salary of $137,957.
Learn more at: https://www.simplilearn.com
Good Bye Credentials in Code, Welcome Azure Managed IdentitiesKasun Kodagoda
This presentation was conducted at the Global Azure Bootcamp 2019 - Sri Lanka as part of the Developer Track . It describe what is Managed Identities for Azure Resources and dives in to details about the types of Managed Identities, How they work behind the scenes, and a demonstrations of using Managed Identities with Azure App Service and Azure Key Vault
Quali vantaggi ci da Azure? Dal punto di vista dello sviluppo software, uno di questi è certamente la varietà dei servizi di gestione dei dati. Questo ci permette di cominciare a non essere SQL centrici ma utilizzare il servizio giusto per il problema giusto fino ad applicare una strategia di Polyglot Persistence (e vedremo cosa significa) nel rispetto di una corretta gestione delle risorse IT e delle pratiche di DevOps.
Microsoft Azure Overview | Cloud Computing Tutorial with Azure | Azure Traini...Edureka!
** Microsoft Azure Certification Training : https://www.edureka.co/microsoft-azure-training **
This Edureka "Microsoft Azure Overview” tutorial will give you a thorough and insightful overview of the subject and help you in getting started with Microsoft Azure. Following are the topics covered in this Azure tutorial:
1. What Is Cloud?
2. Cloud Computing Patterns
3. Cloud Service Models
4. What Is Azure?
5. Azure Platform
6. Azure Services
7. Demo
Check out our Playlists: https://goo.gl/A1CJjM
Azure Billing features are used to review your invoiced costs and manage access to billing information. In larger organizations, procurement and finance teams usually conduct billing tasks.
Billing is the process of invoicing customers for goods or services and managing the commercial relationship.
Cost Management shows the organizational cost and usage patterns with advanced analytics. Azure Portal let you manage both Billings and cost management for all your accounts.
Power Platform24: Essential Azure for Dynamics 365 ProfessionalsAli Khan
As many of the solutions developed in D365 are hybrid (multiple first-party apps, use Power Apps app, PCF etc) and integration is becoming more pervasive (thanks to 100s of connectors), I talked about “Essential Azure for Dynamics 365 professionals” in #Power24 event last week. Here is the video and accompanying slide deck.
We looked at a few problem statements (common challenges in D365 projects) and how Azure products can help in an easy and often no-code-low-code way.
Key takeaways (if you haven’t worked on Azure before) is that:
> Azure is big (highly likely you will find a product-fit for any problem you are looking for)
> Azure is approachable
> Azure provides no-code solutions too!
Write retrogames in the web and add something more with AzureMarco Parenzan
Mi piacciono i retrogames, sin da quando ho iniziato a usare i computer con il mio amato Commodore 64 negli anni ottanta. Così nel mio (poco) tempo libero cerco di reimplementare, non come sviluppatore professionista, i giochi più semplici e coinvolgenti con cui ho giocato, portandoli sul web con JavaScript e Phaser.io. Quindi voglio condividere la mia esperienza.
Poi, dato che lavoro con Azure e i giochi diventano delle Web App, cerco di evolvere i giochi aggiungendo alcune nuove e moderne funzionalità, così per sperimentare un po' i vari servizi di Azure, soprattutto quelli che normalmente uso meno.
Experts Live Norway - Azure Infrastructure SecurityTom Janetscheck
In today's cloud era, admins struggle to keep their IT infrastructures safe. Cloud security is joint responsibility and what we need is a new approach!
In this session, you will learn how to securely deploy and maintain Azure infrastructure solutions, why automation is essential, what network security and encryption options you have, and how access control can prevent you from having sleepless nights.
We will successfully attack an Azure environment live on stage, dive deep into Azure Security Center, and see how we can use it to ultimately secure IT infrastructures on premises, hybrid, and on Azure.
AWS re:Invent 2016: Automating Security Event Response, from Idea to Code to ...Amazon Web Services
With security-relevant services such as AWS Config, VPC Flow Logs, Amazon CloudWatch Events, and AWS Lambda, you now have the ability to programmatically wrangle security events that may occur within your AWS environment, including prevention, detection, response, and remediation. This session covers the process of automating security event response with various AWS building blocks, taking several ideas from drawing board to code, and gaining confidence in your coverage by proactively testing security monitoring and response effectiveness before anyone else does.
How Level Infinite Implemented CQRS and Event Sourcing on Top of Apache Pulsa...ScyllaDB
A use-case study of why Tencent uses ScyllaDB as the state store of our Proxima Beta gaming platform's service architecture. How we leverage multi-datacenter replication for global data distribution and governance, as well as time window compaction strategy (TWCS) to power a distributed queue-like event store specialized to our scenario.
The systems administrator role is perhaps one of the oldest in computer technology. However in this modern cloud computing world some of them will evolve into Cloud Administrators. As for those admins? It could be a case of how more things change, the more they stay the same. In their new role as an Azure Administrator they will be responsible for implementing, monitoring and maintaining Azure resources and use a complete new skill set. In this session you will learn 7 habits every new Azure admin must have. You will not only learn about Azure Cost Management, and Azure Governance, but also which tools you can use to connect securely to your Azure resources. So join us in this session to learn some tips, tricks and things you should keep in mind in this new job role.
This Cloud Computing presentation will help you understand why Cloud Computing has become so popular, what is Cloud Computing, types of Cloud Computing, Cloud providers, the lifecycle of a Cloud Computing solution and finally a demo on AWS EC2 and AWS S3. With the increased importance of Cloud Computing, qualified Cloud solutions architects and engineers are in great demand. Organizations have moved to cloud platforms for better scalability, mobility, and security. In simple words, cloud computing is the use of a network of remote servers hosted on the internet to store, manage and process data rather than a local server. With the increased importance of Cloud Computing, qualified Cloud solutions architects and engineers are in great demand. This presentation explains to you why we need cloud computing and why it has got so much importance in the current market.
Below topics are explained in this Cloud Computing presentation:
1. Why cloud computing?
2. What is cloud computing?
3. Types of cloud computing?
4. Cloud providers
5. The lifecycle of a cloud computing solution
6. Cloud computing with AWS
7. Demo - AWS EC2 and AWS S3
Simplilearn’s Cloud Architect Master’s Program will build your Amazon Web Services (AWS) and Microsoft Azure cloud expertise from the ground up. You’ll learn to master the architectural principles and services of two of the top cloud platforms, design and deploy highly scalable, fault-tolerant applications and develop skills to transform yourself into an AWS and Azure cloud architect.
Why become a Cloud Architect?
With the increasing focus on cloud computing and infrastructure over the last several years, cloud architects are in great demand worldwide. Many organizations have moved to cloud platforms for better scalability, mobility, and security, and cloud solutions architects are among the highest paid professionals in the IT industry.
According to a study by Goldman Sachs, cloud computing is one of the top three initiatives planned by IT executives as they make cloud infrastructure an integral part of their organizations. According to Forbes, enterprise IT architects with cloud computing expertise are earning a median salary of $137,957.
Learn more at: https://www.simplilearn.com
Good Bye Credentials in Code, Welcome Azure Managed IdentitiesKasun Kodagoda
This presentation was conducted at the Global Azure Bootcamp 2019 - Sri Lanka as part of the Developer Track . It describe what is Managed Identities for Azure Resources and dives in to details about the types of Managed Identities, How they work behind the scenes, and a demonstrations of using Managed Identities with Azure App Service and Azure Key Vault
Quali vantaggi ci da Azure? Dal punto di vista dello sviluppo software, uno di questi è certamente la varietà dei servizi di gestione dei dati. Questo ci permette di cominciare a non essere SQL centrici ma utilizzare il servizio giusto per il problema giusto fino ad applicare una strategia di Polyglot Persistence (e vedremo cosa significa) nel rispetto di una corretta gestione delle risorse IT e delle pratiche di DevOps.
Microsoft Azure Overview | Cloud Computing Tutorial with Azure | Azure Traini...Edureka!
** Microsoft Azure Certification Training : https://www.edureka.co/microsoft-azure-training **
This Edureka "Microsoft Azure Overview” tutorial will give you a thorough and insightful overview of the subject and help you in getting started with Microsoft Azure. Following are the topics covered in this Azure tutorial:
1. What Is Cloud?
2. Cloud Computing Patterns
3. Cloud Service Models
4. What Is Azure?
5. Azure Platform
6. Azure Services
7. Demo
Check out our Playlists: https://goo.gl/A1CJjM
Azure Billing features are used to review your invoiced costs and manage access to billing information. In larger organizations, procurement and finance teams usually conduct billing tasks.
Billing is the process of invoicing customers for goods or services and managing the commercial relationship.
Cost Management shows the organizational cost and usage patterns with advanced analytics. Azure Portal let you manage both Billings and cost management for all your accounts.
Similar to Serverless cqrs using azure event grid (20)
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Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
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https://alandix.com/academic/papers/synergy2024-epistemic/
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Threats to mobile devices are more prevalent and increasing in scope and complexity. Users of mobile devices desire to take full advantage of the features
available on those devices, but many of the features provide convenience and capability but sacrifice security. This best practices guide outlines steps the users can take to better protect personal devices and information.
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Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
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Alt. GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using ...James Anderson
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The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
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LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...
Serverless cqrs using azure event grid
1. "SERVERLESS" CQRS USING
AZURE EVENT GRID
Using Azure Event Grid as the backbone for a serverless CQRS architecture
DUBLIN
Lets trend! …
#GlobalAzure
@Merrion
2. AGENDA
• What is CQRS?
• What is event sourcing?
• How to do it on Event Grid
• Q & A
4. WHAT IS EVENT SOURCING?
Open
Account
Open
Account
Open
Account
Deposit Money
Deposit Money
Deposit Money
Withdraw
Money
Withdraw
Money
Close Account
$10.00
$10.00
$5.00
$5.00
$10.00
Aidan
00001
Margaret
00002
Fearghal
00003
17. LESSONS LEARNED
• Keep your functions small (do only one business thing per
function)
• Hook up application insights to see inside your business
application
• Be wary of knitting together domains – you can make an anti
corruption layer in Event Grid
• Be careful with what can be parallel vs what cannot. (If things
have to happen in a sequence then have them trigger each
other as a function pipeline.)
• Only write the code that only you can write (business)
22. XBOX & OTHER PRIZES…
FILL IN THE FORM!
https://aka.ms/azurebootcampireland
Editor's Notes
The key words are “CQRS” which is what we are going to do, and “Event Grid” which is how.
I’ll start by describing the architecture pattern CQRS and a side track into a concept called “event sourcing” which are applicable to many different technologies then will go ahead and show how you would go about doing this on top of Event Grid.
At its simplest, CQRS – command query separation of responsibilities – is an architecture whereby commands (those things that alter the state of the system) are kept separate from queries (that get the state of the system).
Commands map to the things that can cause the state of your application to change – the event publishers.
1) Blob storage could be used as a sort of “in tray” that converts a file arrival into a command.
2) Event Hubs can be used to react to commands sent from other domains (or internally within this domain)
3) Custom topics
Event Grid is now in “General Availability” so can be run from whichever region you have chosen for your domain.
There are SDKs for a number of programming languages – C#, Python, Node.js – and the REST API means you can access it from a large range of other programming environments.
You should also have some idea of the commands and events that make up your application – although it is as easy (maybe arguably easier) to add new events as your business domain requires them.
For commands that have a data payload greater than the maximum size of an event (64kb) then saving the file data as a file into a designated blob storage location can trigger the event with the file location being a parameter of that command. You can envisage these blob storage locations as application in-trays.
For smaller commands you can wrap the entire business data in an application specific event that goes in a custom topic
For events relating to an actual race we can envisage an IoT hub being used to send data from sensors (or fit bit type devices) and here we rely on the massive throughput capabilities of IoT hub.
Alternatively for an occasionally connected model you could record the events on a tablet and fire them up to your system by saving the results file to a storage location.
When something (a domain event) happens and is ingested by the system we need to do a two step process in order to persist that event’s occurrence
Turn the event into an event classification
Append it to whichever entity’s event stream that it applies to
Trigger any notifications that the event occurred that other parts of the system may be listening to
The event stream can be stored as an AppendBlob, in Azure Tables, File, CosmosDB etc.
To trigger a query to run, a specific query requested custom topic is passed into the system with the appropriate parameters.
This is then routed to an appropriate query handler which can be an azure function, a logic app or even calling an external program using webhooks.
Results are calculated by running the appropriate projections over the event streams and performing any map-reduce collation on the returned data.
Results can then be distributed – either back to the caller’s application by web hooks or by email, twitter etc. using a logic app.
(This could be triggered by the results being written to an “out-tray” location in Azure storage for example)
This approach works best for predefined queries with matching predefined query handlers. However you can, of course, persist the output of these queries to a denormalised relational database store for more ad hoc querying.
OK – a quick demo to show how these ideas sit on top of Azure Event Grid…
The application for this demo represents a rudimentary system for use by a running organisation – if you are familiar with the “Meet and train league” or “Parkruns” you will know the general idea.
This is split up into four domains:- League, Team, Race and Runner and each domain is represented as its own Azure functions app.
There is also a linked storage account for each of these domains that holds the event streams and data snapshots for that domain.
Each domain has its own distinct storage account in order to keep everything separate.
Each of these has a number of containers in e.g.
command logs / query logs to store the incoming commands details for debugging and audit purposes
An in-tray for message payloads that are greater than 64kb
Documentation to describe the commands/queries and parameters for the public interface to your domain
2) Separate event hubs for routing commands and queries around
3) Custom event grid topics for each specific command or query
We send a command into the system by posting a message to the command endpoint with the event detail contained in the HTTP request body.
Security is performed by having an access token passed in the HTTP request headers.
The event grid topic triggers a subscription for the “Command Logger” which is an azure function which gives the command an unique identifier then writes it to the “command-log”
This is so we have an audit trail of every command and can deal with failed commands.
Then the command is passed to the function or functions that comprise the command handling.
This could include validation and any set-up actions that need to be performed.
Finally the command is turned into one or more events which are persisted to the event stream to cause the change to occur.
Running a query is triggered in a very similar manner to the command – we pass a message to the event grid topic for the query type with the parameters in the HTTP request body.
In addition we pass parameters to tell the query handler where and how to deliver the results when the query completes.
The query parameters are logged and then passed to a query handler function.
The query handler is tasked with picking up the identity group over which the query will run and then running the projection (or projections) that comprise the query before collating the results.
When a query completes the results are written to a results cache (so that we do not process the same question twice)
The results are then returned to where the request specified
For the latest pricing, check the above link because prices do change fairly rapidly (nearly always downwards though).