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The Future of SQL
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Several venture-backed startups have recently embraced the idea of database server appliances once again, sometimes in the form of database caching servers that reside in a network between the application and an enterprise database. In such a configuration, the absolute transparency of the cache is critical, and the emergence of MySQL as an extremely popular open source database has helped to enable that transparency. Many of the database appliances run MySQL software, so the application accessing the database can t tell whether it is communicating with the appliance or with MySQL running on a conventional server. Oracle has also reenergized the database appliance concept, announcing a high-end Oracle database appliance whose hardware comes from Hewlett-Packard.
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SQL Standardization
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The adoption of an official ANSI/ISO SQL standard was one of the major factors that secured SQL s place as the standard relational database language in the 1980s. Compliance with the ANSI/ISO standard has become a check-off item for evaluating DBMS products, so each DBMS vendor claims that its product is compatible with or based on the ANSI/ISO standard. Through the next 20 years, all of the popular DBMS products evolved to conform to the parts of the standard that represented common usage. Other parts, such as the module language, were effectively ignored. This produced slow convergence around a core SQL language in popular DBMS products. As discussed in 3, the original SQL standard was relatively weak, with many omissions and areas that are left as implementation choices. For several years, the standards committee worked on an expanded SQL2 standard that remedied those weaknesses and that significantly extended the SQL language. Unlike the first SQL standard, which specified features that were already available in most SQL products, the SQL2 standard, when it was published in 1992, was an attempt to lead rather than follow the market. It specified features and functions that were not yet widely implemented in current DBMS products. Some of these features, such as its enhanced join capabilities and broader use of subqueries, are effectively mainstream capabilities today, while others, even if widely implemented, have not been widely adopted. The same pattern has continued with subsequent revisions of the SQL standard, published in 1999, in 2003, and over the last few years. The size of the standard has grown substantially, more than tripling in the progression from SQL2 to today s full standard, which is divided into almost a dozen different subparts. In newer areas, such as the incorporation of XML, the race continues between proprietary innovation by the DBMS vendors seeking competitive advantage and the evolution of the standard to ensure SQL portability. The likely future path of SQL standardization appears to be a continuation of the trajectory followed in recent years. The core of the SQL language will continue to be highly standard. More features will slowly become a part of the core and will be defined as add-on packages or new standards in their own right. Database vendors will continue to add new, proprietary features in an ongoing effort to differentiate their products and respond to emerging market requirements. Over time, the proprietary features that become the most popular will become the features where customers demand standardization, and the vendors and standards committees will respond.
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Part VI:
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SQL Today and Tomorrow
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SQL in the Next Decade
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Predicting the path of the database market and SQL over the next five to ten years is a risky proposition. Each major technology wave over the past three decades has had a significant impact on data management and SQL. The emergence of the PC and its creation of the client/server era of the 1980s and 1990s is an early example. More recently, the emergence of the Internet and its browser-based architecture has produced a new wave of Internetbased data management, delivered as Web Services. Going forward, the Internet appears poised to become truly ubiquitous, with broadband or wireless networks interconnecting every type of electronic device. It s likely that this next stage of the Internet revolution could have an even more disruptive impact on the data management architectures of the future than the first wave of Internet deployment had over the last decade. Nonetheless, several trends appear to be safe predictions for the future evolution of database management. They are discussed in the final sections of this chapter.
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