Is there any performance penalty to using Windows Azure SQL Database (formerly known as SQL Azure) from within a Windows Azure VM hosted web app? I would like to know if the performance of this is any worse than using Azure SQL database from a website running on Azure reserved instance. The assumption in both scenarios is that Azure SQL Database is deployed in the same region as the app.
There should not be any difference with respect to utilization of SQL Azure
As #Igorek pointed out, there's no difference (assuming same data center) between using a Virtual Machine and a Website for accessing Windows Azure SQL. That said: One thing that may not be so obvious is that, today, Virtual Machines (and Cloud Services) support XL instances (meaning 800Mbps on the NIC) vs Websites, which are currently limited to Large reserved instances (400Mbps). So... if you're moving a considerable amount of data, you'll get better throughput with an XL Virtual Machine vs. a Large Website instance.
I realize this is an edge case, but just thought I'd throw it out there...
There may be some difference in performance which depends on the configuration on the Virtual Machine and the Website Infrastructure where the Website is Hosted.
The connections in-bound and out-bound performances depends on the load balancing which is abstracted in Azure. This relates to the infrastructure which is in place.
For instance if the VM is in Basic Tier More on VM Sizing, and the website is hosted with a higher configuration, you may get some variance in Performance.
Related
I work in a small company and we develop PowerBI dashboards for a few clients. Data sources tend to change with each client from MySQL, MariaDB, SQL Server, Excel etc. Most clients want to setup scheduled refreshes but in order to do that we need a Data Gateway. So far i've used my machine as a gateway but that requires my computer to be on all the time which is not ideal. Since our clients data is usually stored in their own networks I believe we need an enterprise data gateway to manage all those scheduled refreshes for our current and future projects.
We don't have any physical on prem infrastructure, most of the company's developemnts are managed through AWS linux cloud servers. From what I've read a possible solution is to have a VM running 24/7 with the enterprise data gateway installed, although this seems a bit expensive taking into consideration Azure VM prices. Is there any other solution to my situation or is a VM the only path I can take?
There is no other option available, On prem data gateway requires installation and configuration to connect your data sources to powerBI, for this we require onprem machine or a VM in azure.
As you are aware the recommended machine configuration is:
An 8-core CPU
8 GB of memory
A 64-bit version of Windows 8 or Server 2012 R2 or later
Solid-state drive (SSD) storage for spooling.
If in case, your resources are running in azure you can use vnet data gateway,It doesn’t require any installation Create virtual network data gateways
I am new to Azure and just trying to get my head around some things.
I have a web app running locally that now connects to a windows azure SQL database. I want to move my local web app into an azure web role. I have two questions:
Do I need to change my connection string or does it just work?
I am assuming windows azure is smart enough to now know that they are both hosted on azure so each request no longer needs to go over the internet?
Cheers
Do I need to change my connection string or does it just work?
No, this is still that same connection string.
I am assuming windows azure is smart enough to now know that they are both hosted on azure so each request no longer needs to go over the internet?
You're both web site and SQL Azure database will be in Azure data center. It depends in which region your web site and database will be. If they are in the same region you'll have low latencies because it will be in the same data center, however if they are in two different regions, then at one point it has to go through connections between data centers called backbones. Even if those are special very fast connections you'll notice higher latencies.
http://www.azurespeed.com/ web site allows you to check what are the latencies between Azure data centers. This gives you a kind of idea.
Answer 1 : Since you are already connecting to SQL azure from local,
you don't need to change the connection string.
Answer 2: If both your Web Role, and SQL azure are in same Geo
Location (say SoutCentral US) then there will not be much internet
traffic, but it will use azure's network to communicate.
I'm running 1 Standard-tier Azure WebSites and trying to get rid of recycle issue and unstable connection for whatever reason.
If I add new instance to same region, is there (1) any difference in performance perspective? (2) Do they have same architectural allocation? (3) and which one is more fail-safe?
Adding another instance to the existing web hosting plan will run on the resources defined by that plan. e.g. if you have two virtual machines instances for your Standard plan, all the web sites associated with that web hosting plan will run on both virtual machines.
Neither is "more" fail-safe, as websites are offered as a Platform-as-a-Service. This means that the servers that are running on are fully managed by Microsoft and are highly available. If you have instance count set to 2, there will always be two instances up, regardless of underlying hardware faults on the Azure fabric.
Source
Azure Websites Web Hosting Plans In-Depth Overview
How does Windows Azure heal?
I have a virtual machine with CentOs in Azure. Running a web-based application with a connection to the database (via public endpoint).
There is one machine with CentOs, which runs a database (MySQL). Approximately 30% of the connections to the database from the web application failed.
I also use API Facebook, and there are also problems with the connection.
What is the size of your Azure VM? Please note that there are I/O quotas applied to each VM size. Thus XS sized VM has just 20mbps connection, where XL can be up to 1Gbps.
Also please make sure you have Azure VM in an Azure Data Centre location which is closest to your MySQL Db.
I run a code that utilizes FB API on Medium sized VM (Worker Role) and don't have issues with it.
I wish to run a web server on Azure. My concern is whether Azure migrates virtual instances (VMs) between physical servers for performance optimization purposes and if so does it provide some kind of guarantees on the performance hit that migration incurs?
For VM performance and availability, you can use Availability Sets to be covered by the 99.95% SLA. This guarantee works due to the use of Fault Domains and Upgrade/Update Domains across physical machines spread across server racks.
More info here: https://azure.microsoft.com/en-us/documentation/articles/virtual-machines-manage-availability/
If you just want to run a web app without having to worry about the VM, you can also use Azure's PaaS offering (just endpoint access) instead of IaaS (full VM access).
More info here: http://azure.microsoft.com/services/app-service/web/
Hope that helps!