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A centralized computer system
Silberschatz Korth Sudarshan: Database System Concepts, Fourth Edition
VI Database System Architecture
18 Database System Architecture
The McGraw Hill Companies, 2001
Centralized and Client Server Architectures
machine at a time A typical multiuser system, on the other hand, has more disks and more memory, may have multiple CPUs and has a multiuser operating system It serves a large number of users who are connected to the system via terminals Database systems designed for use by single users usually do not provide many of the facilities that a multiuser database provides In particular, they may not support concurrency control, which is not required when only a single user can generate updates Provisions for crash-recovery in such systems are either absent or primitive for example, they may consist of simply making a backup of the database before any update Many such systems do not support SQL, and provide a simpler query language, such as a variant of QBE In contrast, database systems designed for multiuser systems support the full transactional features that we have studied earlier Although general-purpose computer systems today have multiple processors, they have coarse-granularity parallelism, with only a few processors (about two to four, typically), all sharing the main memory Databases running on such machines usually do not attempt to partition a single query among the processors; instead, they run each query on a single processor, allowing multiple queries to run concurrently Thus, such systems support a higher throughput; that is, they allow a greater number of transactions to run per second, although individual transactions do not run any faster Databases designed for single-processor machines already provide multitasking, allowing multiple processes to run on the same processor in a time-shared manner, giving a view to the user of multiple processes running in parallel Thus, coarsegranularity parallel machines logically appear to be identical to single-processor machines, and database systems designed for time-shared machines can be easily adapted to run on them In contrast, machines with ne-granularity parallelism have a large number of processors, and database systems running on such machines attempt to parallelize single tasks (queries, for example) submitted by users We study the architecture of parallel database systems in Section 183
1812 Client Server Systems
As personal computers became faster, more powerful, and cheaper, there was a shift away from the centralized system architecture Personal computers supplanted terminals connected to centralized systems Correspondingly, personal computers assumed the user-interface functionality that used to be handled directly by the centralized systems As a result, centralized systems today act as server systems that satisfy requests generated by client systems Figure 182 shows the general structure of a client server system Database functionality can be broadly divided into two parts the front end and the back end as in Figure 183 The back end manages access structures, query evaluation and optimization, concurrency control, and recovery The front end of a database system consists of tools such as forms, report writers, and graphical userinterface facilities The interface between the front end and the back end is through SQL, or through an application program
Silberschatz Korth Sudarshan: Database System Concepts, Fourth Edition
VI Database System Architecture
18 Database System Architecture
The McGraw Hill Companies, 2001
18
Database System Architectures
client
client
client
client network
server
Figure 182 General structure of a client server system
Standards such as ODBC and JDBC, which we saw in 4, were developed to interface clients with servers Any client that uses the ODBC or JDBC interfaces can connect to any server that provides the interface In earlier-generation database systems, the lack of such standards necessitated that the front end and the back end be provided by the same software vendor With the growth of interface standards, the front-end user interface and the back-end server are often provided by different vendors Application development tools are used to construct user interfaces; they provide graphical tools that can be used to construct interfaces without any programming Some of the popular application development tools are PowerBuilder, Magic, and Borland Delphi; Visual Basic is also widely used for application development Further, certain application programs, such as spreadsheets and statistical-analysis packages, use the client server interface directly to access data from a back-end server In effect, they provide front ends specialized for particular tasks Some transaction-processing systems provide a transactional remote procedure call interface to connect clients with a server These calls appear like ordinary procedure calls to the programmer, but all the remote procedure calls from a client are enclosed in a single transaction at the server end Thus, if the transaction aborts, the server can undo the effects of the individual remote procedure calls
SQL user-
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