File-sharing systems are another example of client/server systems. File servers and filesystem servers serve client requests for access to files and filesystems, sometimes in very sophisticated ways. NFS and the Windows Named Pipes and NetBEUI services are examples. The file server gives clients access to files that the client machine can read into its own memory and write to, as though it were performing I/O on its own local storage system.
A desktop-based data management system, lacking its own internal provisions to manage I/O requests from a network, is itself a client of the file server. When it receives I/O requests from its own clients, it depends on operating system controls to provide the central locking and queuing system necessary to manage conflicting requests.
These file-served DBMSs are not client/server database systems. Both the client and the DBMS software are clients to a file-sharing server. Although the flow of input and, often, output are to some extent managed by the DBMS program, physical data integrity is under the control of the filesystem services.
In a client/server database relationship, clients —even if located on the same machine as the server—never get closer to the physical data than sending messages to the server about what they want to do. The server processes the messages and executes the requests using its own code and, in advanced systems like Firebird, its own disk management and accounting system. The server program performs all of the physical changes to metadata and data storage structures within a physical on-disk structure that is independent of the host’s filesystem-level I/O layer and inaccessible to it.
Firebird Related Interview Questions
|RDBMS Interview Questions||MySQL Interview Questions|
|Linux Interview Questions||Mac OS X Deployment Interview Questions|
|Windows Administration Interview Questions||Windows Server 2003 Interview Questions|
|SQL Interview Questions||NoSQL Interview Questions|
|Advanced C++ Interview Questions|
Introduction To Client/server Architecture
About Firebird Data Types
Date And Time Types
Blobs And Arrays
From Drawing Board To Database
Creating And Maintaining A Database
Firebird’s Sql Language
Expressions And Predicates
Querying Multiple Tables
Ordered And Aggregated Sets
Overview Of Firebird Transactions In
Programming With Transactions
Introduction To Firebird Programming
Developing Psql Modules
Error Handling And Events
Security In The Operating Environment
Configuration And Special Features
Interactive Sql Utility (isql)
Database Backup And Restore (gbak)
Housekeeping Tool (gfix)
Understanding The Lock Manager
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