An application server provides business logic for application programs and supports the construction of dynamic web pages. It allows applications to run on multiple parallel servers for improved scalability and performance. Key features include clustering for load distribution, failover for automatic switching to redundant servers, and load balancing to optimize resource utilization. Application servers provide advantages like centralized configuration, data integrity, and security. Common application servers include Java Enterprise Edition servers and the Zend platform for PHP applications.

1. Application server

2. Table of contents Overview Services Clustering Fail-over Load_balancing Java appl server Zend platform Advantages Data and code integrity Centralized configuration Security Apache jserv protocol Application layer protocol

3. Overview An application server is a server program in a computer. Provides the business logic for an application program. The application server is frequently viewed as part of a three-tier application 1.GUI(personal computer,work station...) 2.server 3.database

4. Cont....

5. Cont... Is a software frame work

6. Efficient execution of procedures

7. programs

8. Routines

9. Scripts

10. Supporting the construction of application

11. main job is to support the construction of dynamic pages.

12. Services... Clustering

13. Fail-over

14. Load-balancing

15. Clustering Clustering allows us to run an applications on several parallel servers

16. The load is distributed across different servers

17. Even if any of the servers fails, the application is still accessible via other cluster nodes.

18. Clustering is crucial for scalable enterprise applications, as you can improve performance by simply adding more nodes to the cluster.

19. Clustering

20. Fail-Over I t is the capability to switch over automatically to a redundant or standby computer serve upon the failure of the previously active application

21. Types of fail-over

22. Automatic

23. manual

24. Cont... Automatic Automatic Failover where 2 servers located in 2 different geographically location. If disaster happens at host site, the secondary server will take over automatically without user or support intervention Manual In this case, user or support team intervention is needed.

25. Failover