Choreography of web services and the impact of estimation of execution plan

Nowadays Web Services are gaining a lot of attention as a new technology, which indicate automated information services and a collection of functions packaged in a single, self-contained entity and conducted over internet for other programs to use. They use the standardized technologies and formats/protocols that simplify the exchange and integration of large amounts of data over the Internet, and as such they make it easier to conduct work across organizations regardless of the types of operating systems, hardware/software, programming languages, and databases that are being used. This paper will express the modeling of Choreography of web services; which is the process of combining different web services with intention to create interactive applications. The interconnection of web services with databases is a valuable step, because it provides backup for data. When it comes to analyzing the performance of a specific query, one of the best methods is to view the query execution plan, which provides information on how a specific DBMS query optimizer runs a specific query. This information is very valuable when we want to find out why a specific query is running slow.