An Overview of MySQL 2 Finally, (Hsphere web hosting) smaller businesses
An Overview of MySQL 2 Finally, smaller businesses and individuals have access to the same powerful level of software tools that large corporations have had access to for over a decade. Why Use an RDBMS? Almost every piece of software that has been developed needs to persist or store data. Once data has been persisted, it is natural to assume that this data needs to be retrieved, changed, searched, and analyzed. You have many options for data persistence in your software, from rolling your own code, to creating libraries that access flat files, to using full-blown RDBMS systems. Factors to consider when choosing a persistence strategy include whether you need multiuser access, how you will manage storage requirements, whether you need transactional integrity, and whether the users of your software need ad hoc query capability. RDBMSs offer all of this functionality. Multiuser Access Many programs use flat files to store data. Flat files are simple to create and change. The files can be used by many tools, especially if they are in comma- or tab-delimited formats. A large selection of built-in and third-party libraries is available for dealing with flat files in Java. The java.util.Properties class included with the Java Development Kit is one example. Flat file systems can quickly become untenable when multiple users require simultaneous access to the data. To prevent corrupting the data in your file, you must lock the file during changes, and perhaps even during reads. While a file is locked, it cannot be accessed by other users. When the file becomes larger and the number of users increases, this leads to a large bottleneck because the file remains locked most of the time your users are forced to wait until they can have exclusive access to the data. RDBMSs avoid this situation by employing a number of locking strategies at varying granularities. Rather than using a single lock, the database system can lock an individual table, an individual page (a unit of storage in the database, usually covering more than one row), or an individual row. This increases throughput when multiple users are attempting to access your data, which is a common requirement in Web-based or enterprise-wide applications. Storage Transparency If you use flat files in your software, you are also responsible for managing their storage on disk. You have to figure out where and how to store the data, and
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