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CHAPTER 2 THE ANATOMY OF A DATABASE SYSTEM
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The MySQL architecture is best described as a layered system of subsystems. While the source code isn t compiled as individual components or modules, the source code for the subsystems is organized in a hierarchical manner that allows subsystems to be segregated (encapsulated) in the source code. Most subsystems rely on base libraries for lower-level functions (e.g., thread control, memory allocation, networking, logging and event handling, and access control). Together the base libraries, subsystems built on those libraries, and even subsystems built from other subsystems form the abstracted API that is known as the C client API. This powerful API is what permits the MySQL system to be used as either a stand-alone server or an embedded database system in a larger application. The architecture provides encapsulation for a SQL interface, query parsing, query optimization and execution, caching and buffering, and a pluggable storage engine. Figure 2-4 depicts the MySQL architecture and its subsystems. At the top of the drawing are the database connectors that provide access to client applications. As you can see, a connector for just about any programming environment you could want exists. To the left of the drawing, the ancillary tools are listed grouped by administration and enterprise services. For a complete discussion of the administration and enterprise service tools, see Michael Kruckenberg and Jay Pipes s Pro MySQL.12 It is an excellent reference for all things administrative for MySQL. The next layer down in the architecture from the connectors is the connection pool layer. This layer handles all of the user access, thread processing, memory, and process cache needs of the client connection. Below that layer is the heart of the database system. Here is where the query is parsed and optimized, and file access is managed. The next layer down from there is the pluggable storage engine layer. It is at this layer that part of the brilliance of the MySQL architecture shines. The pluggable storage engine layer permits the system to be built to handle a wide range of diverse data or file storage and retrieval mechanisms. This flexibility is unique to MySQL. No other database system available today provides the ability to tune databases by providing several data storage mechanisms.
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Note The pluggable storage engine feature is available beginning in version 5.1.
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Below the pluggable storage engine is the lowest layer of the system, the file access layer. It is at this layer that the storage mechanisms read and write data, and the system reads and writes log and event information. This layer is also the one that is closest to the operating system, along with thread, process, and memory control. Let s begin our discussion of the MySQL architecture with the flow through the system from the client application to the data and back. The first layer encountered once the client connector (ODBC, .NET, JDBC, C API, etc.) has transmitted the SQL statements to the server is the SQL interface.
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12. M. Kruckenberg and J. Pipes. Pro MySQL (Berkeley, CA: Apress, 2005).
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CHAPTER 2 THE ANATOMY OF A DATABASE SYSTEM
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Figure 2-4. MySQL server architecture (Copyright MySQL AB. Reprinted with kind permission. )
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The SQL interface provides the mechanisms to receive commands and transmit results to the user. The MySQL SQL interface was built to the ANSI SQL standard and accepts the same basic SQL statements as most ANSI-compliant database servers. Although many of the SQL commands supported in MySQL have options that are not ANSI standard, the MySQL developers have stayed very close to the ANSI SQL standard. Connections to the database server are received from the network communication pathways and a thread is created for each. The threaded process is the heart of the executable pathway in the MySQL server. MySQL is built as a true multithreaded application whereby each thread executes independently of the other threads (except for certain helper threads). The incoming SQL command is stored in a class structure and the results are transmitted to the client by writing the results out to the network communication protocols. Once a thread has been created, the MySQL server attempts to parse the SQL command and store the parts in the internal data structure.
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