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Database Server Concepts and Possibilities. Lee Lueking D0 Data Browser Workshop April 8, 2002. What Role Does The DB Server Play?. The DB server represents the middle tier of a three tier architecture. Reference material available at http://d0db-dev.fnal.gov/db_server_gen. Client. Client.
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Database Server Concepts and Possibilities Lee Lueking D0 Data Browser Workshop April 8, 2002
What Role Does The DB Server Play? • The DB server represents the middle tier of a three tier architecture. • Reference material available at http://d0db-dev.fnal.gov/db_server_gen Client Client Client CORBA DB Server SQLnet Database Oracle
What Are Pros and Cons of 3 Tier Architecture? • Advantages • Significantly reduces the required number of concurrent client licenses required (significant savings when using commercial db). • Enables any internet connected node to run client processes. • Insulates client from changes in DB schema, and visa versa. • Enables client applications to be coded in any language. • Much more scalable approach: 1) Allows customized caching and other services to be built into middle tier, 2) Dbservers can be operated on “cheap” hardware. • Disadvantages • Complex environment • Debugging at all tiers more complicated. • Adds additional level of abstraction for developers and users. • Reduces effectiveness of Oracle server caching and optimization
Where Do We Use DB Serves? • SAM specific servers • SAM user (serves SAM users) • SAM prd (serves most SAM stations) • SAM web (dedicated to web-based dataset editor) • DLSAM (dedicated to online station) • Central-Analysis (dedicated to CA station) • D0 Farm (dedicated to D0 FNAL processing farm) • Offline Trigger DB • Offline Luminosity • Generalized servers • Offline Calibration (many) • Offline Run Config
Using a DB Server With a Browser • Can easily develop a DB browser for any CORBA enabled framework. • Could create interface ROOT interface to allow creation of ROOT trees for analysis (similar to Andrei’s approach). • The web-based SAM dataset editor uses a Java Servlet and Java Server Pages (JSP) to provide a performant tool for viewing (and modifying in the SAM case) database tables. • Other tools could be used, like php.
The SAM Dataset Definition Editor • Uses the Apache and Tomcat (specific implementation of JS and JSP) • Dataset definition editor
Future DB Server Features • The Second Generation “general” DB server is now in design. • Has much better caching, monitoring, connection, and robustness features. • Jim can discuss this…