Architecture N-Tier - Deptinfo - Cnam
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Les architectures N-tiers
ARCHITECTURES N-TIER 1/9 L’architecture N-tier (anglais tier : étage niveau) ou encore appelée multi-tier est une architecture client-serveur dans laquelle une application est exécutée par plusieurs composants logiciels distincts Exemple d’architecture 3-tier : Tier de présentation : interfaces utilisateurs sur un PC |
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Distributed Access Structures
n o r s If we do not add some information: node a receives all the messages node b receives half of the messages node d 1/4 of the messages etc ⇒ we will partially replicate the tree structure at each node to balance the query load WebDam (INRIA) Distributed Access Structures January 3 2011 9 / 20 |
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Notes on N-Tier Architectures
N-Tier Architectures (2) N-Tier : An unlimited number of tiers Each tier may have multiple computers Advantages : More powerful applications Many services to many clients Enhanced security scalability and availability Disadvantages : Software is more complex (effects design reliability maintainability) |
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332 IEEE/ACM TRANSACTIONS ON NETWORKING VOL 17 NO 1
The proposed architecture also provides a high level of network reliability The large improvement in network efficiency of the Petaweb architecture comes at the expense of a significant increase in Manuscript received August 08 2005; revised August 29 2006 and June 08 2007;approvedbyIEEE/ACMTRANSACTIONS ONNETWORKINGEditorF Neri |
Benefits
•Portability between cloud and on-premises, and between cloud platforms. •Less learning curve for most developers. •Natural evolution from the traditional application model. •Open to heterogeneous environment (Windows/Linux) learn.microsoft.com
Challenges
•It's easy to end up with a middle tier that just does CRUD operations on the database, adding extra latency without doing any useful work. •Monolithic design prevents independent deployment of features. •Managing an IaaS application is more work than an application that uses only managed services. •It can be difficult to manage network security in a large system. learn.microsoft.com
Best practices
•Use autoscaling to handle changes in load. See Autoscaling best practices. •Use asynchronous messaging to decouple tiers. •Cache semistatic data. See Caching best practices. •Configure the database tier for high availability, using a solution such as SQL Server Always On availability groups. •Place a web application firewall (WAF) between the front end and the Internet. •Place each tier in its own subnet, and use subnets as a security boundary. learn.microsoft.com
N-tier architecture on virtual machines
This section describes a recommended N-tier architecture running on VMs. Each tier consists of two or more VMs, placed in an availability set or virtual machine scale set. Multiple VMs provide resiliency in case one VM fails. Load balancers are used to distribute requests across the VMs in a tier. A tier can be scaled horizontally by adding more VMs to the pool. Each tier is also placed inside its own subnet, meaning their internal IP addresses fall within the same address range. That makes it easy to apply network security group rules and route tables to individual tiers. The web and business tiers are stateless. Any VM can handle any request for that tier. The data tier should consist of a replicated database. For Windows, we recommend SQL Server, using Always On availability groups for high availability. For Linux, choose a database that supports replication, such as Apache Cassandra. learn.microsoft.com
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Présentation PowerPoint
CNAM 2009 - 2010. Patrick Arlaud - Jérome Dupire. 1. Architecture N-Tier. Architecture Multi-Tier. Traditionnellement une application informatique est un |
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Les WEB SERVICES Yves Laloum PLAN
Commerce électronique. ? présentation sélection |
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Introduction aux S. G. B. D.
modification de données qu'ils n'utilisent pas. Application n° 3 : Gestion du personnel : les médecins (Nom Grade |
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Introduction aux S. G. B. D.
modification de données qu'ils n'utilisent pas. Application n° 3 : Gestion du personnel : les médecins (Nom Grade |
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U&ARSI « Urbanisation & ARchitecture des Systèmes dInformation »
elle offre de grandes capacités d'extension elle facilite la gestion des sessions. Page 46. 46. 4- Les architectures n-tiers (suite). |
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Stratégie de test au sein du processus dévolution darchitecture de
10 juin 2014 CNAM de Nantes – 2010 / 2011 – Mémoire d'ingénieur. Laurent GARNIER ... Figure 7 : Extrait du métamodèle architecture n-tiers (ANT) . |
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Concepteur en architecture informatique option Réseaux et systèmes
7 juin 2013 Conservatoire N a t i o n a l d e s A r t s e t M é t i e r s. 18 rue Claude Chappe ? ZAC 2000 ? BP 274 ? 97827 ? Le Port Cedex. |
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Titre professionnel RNCP 6 Concepteur en architecture informatique
15 juil. 2019 Pour tout renseignement contactez le service accueil : ? par téléphone au 0262.42.28.37. ? par mail à info@cnam.re. ? horaires d'ouverture ... |
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Analyste programmeur parcours 1 : Programmation de gestion
7 juin 2013 Conservatoire N a t i o n a l d e s A r t s e t M é t i e r s ... suivants : programmation algorithmique |
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Concepteur en architecture informatique option Réseaux et systèmes
3 juil. 2014 Conservatoire N a t i o n a l d e s A r t s e t M é t i e r s. 18 rue Claude Chappe ? ZAC 2000 ? BP 274 ? 97827 ? Le Port Cedex. |
