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Because of the formidable obstacles to realizing the ideal distributed database, DBMS vendors have taken a step-by-step approach to databases and networking. They have focused on specific forms of network database access, data distribution, and distributed data management that are appropriate for particular application scenarios. For example,
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a DBMS vendor may first provide tools to rapidly extract subset data from a master database and send it across a network for loading into a slave database. Later, the vendor may enhance the tool to track updates to the master database since the last extract, and to extract and transmit only the changes to the master database. A subsequent version of the tool may automate the entire process, providing a graphical user interface for specifying the data to be extracted and scripts to automate the periodic extract process. Similarly, a DBMS may provide initial support for distributed queries by allowing a user on one system to query a database located on another system. In subsequent releases, the DBMS may allow the remote query as a subquery within a query that accesses local database tables. Still later, the DBMS may allow distributed queries that more freely intermix data from local and remote databases.
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One of the simplest approaches to managing data stored in multiple locations is remote data access. With this capability, a user of one database is given the ability to reach out across a network and retrieve information from a different database. In its simplest form, this may involve carrying out a single query against the remote database, as shown in Figure 23-2. It may also involve performing an INSERT, UPDATE, or DELETE statement to modify the remote database contents. This type of requirement often arises when the local database is a satellite database (such as a database in a local sales office or distribution center) and the remote database is a central, corporate database.
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Figure 23-2.
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In addition to the remote data access request, Figure 23-2 also shows a client/server request to the remote database from a (different) PC user. Note that, from the standpoint of the remote database, there is very little difference between processing the request from the PC client and processing the remote database access request. In both cases, a SQL request arrives across the network and the remote database determines that the user making the request has appropriate privileges and then carries it out. And, in both cases, the status of the SQL processing is reported back across the network. The local database in Figure 23-2 must do some very different work than the process it normally uses to process local database requests, however. There are several complications for the local DBMS: I It must determine which remote database the user wants to access, and how it can be accessed on the network. I It must establish a connection to the remote database for carrying out remote requests. I It must determine how the local user authentication and privilege scheme maps to the remote database. That is, does it simply pass the user name/password supplied for local database access to the remote database, or is a different remote user name/password supplied, or should some kind of automatic mapping be performed In effect, the local DBMS becomes an agent for the user making the remote access request. It becomes a client in a client/server connection to the remote DBMS. Several of the leading enterprise DBMS vendors offer the kind of remote database access capability shown in Figure 23-2. They differ in the specific way that remote access is presented to the user and to the database administrator. In some cases, they involve extensions to the SQL language accepted by the DBMS. In others, the extra mechanisms for establishing remote access are mostly external to the SQL language. Sybase offers a simple entry-level remote database access capability. While connected to a local Sybase installation, the user can issue a CONNECT TO SQL statement, naming a remote server that is known to the local server. For example, if a remote server named CENTRALHOST contains a copy of the sample database, then this statement:
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