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[user@host]# /usr/local/mysql/sql-bench/run-all-tests --server=mysql
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Figure 9-3 illustrates what the output of this might look like
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9:
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Optimizing Performance
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PARTIII PART PART
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Figure 9-3 The output of the run-all-tests script
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As you can see, this script runs each of the test cases listed in Table 9-1, returning the time taken by each More information on the details of each test case can be obtained by invoking the corresponding script without any parameters Most of the scripts print a brief description of their purpose before starting If you d like to run a specific test only, you can do that, too, simply by invoking the appropriate script Consider the following example, which runs the test-connect script to benchmark the time taken to connect to the server and send data to it:
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[user@host]# /usr/local/mysql/sql-bench/test-connect
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Figure 9-4 illustrates what this might look like Notable among the various test scripts included in the MySQL Benchmark Suite is crash-me, a utility designed specifically for the purpose of evaluating a SQL server s capabilities by pushing it up to (and beyond) its limits Crash-me works by sending a variety of legal SQL queries to the server and, from its response, determining the feature set, capabilities, and limitations of the server
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C auTion In order to test server functionality, crash-me pushes the database server to its limits
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It will almost certainly affect system performance while it is running and may even cause the server to crash Therefore, it should be used with care, and never on a production server Figure 9-5 illustrates the output of a crash-me run
Part I:
Usage
Figure 9-4 The output of the test-connect script
Figure 9-5 An example crash-me run
9:
Optimizing Performance
Summary
This chapter explored the important topic of MySQL performance optimization, discussing some of the techniques and options available to help you squeeze a little more speed out of your MySQL installation Various strategies for query optimization were covered, including: Using indexes to speed up access to frequently used fields Using the MySQL query cache to improve query response time Analyzing queries with the EXPLAIN SELECT command to understand and then improve the query plan Rewriting subqueries as joins to take advantage of MySQL s optimization algorithms Using server variables, aggregate functions, and sorting to make multitable queries more efficient Selecting an isolation level appropriate to your needs Avoiding deadlocks by keeping the internal flow of database transactions consistent Using session variables for transient data within stored routines Creating data subsets with the INSERTSELECT command and one or more temporary tables to simplify the processing of complex queries Choosing field sizes appropriately, and removing unnecessary tables from your database design Tuning the server s cache and memory buffers to obtain better performance Benchmarking server performance with the MySQL Benchmark Suite to evaluate the results of your changes Query optimization is almost a science unto itself, and impossible to cover in the limited space available in this chapter However, these techniques (as well as the additional following links) are essential reading for the efficient operation of your database, and they should be part of every administrator s tool box Here are some links for further reading: An overview of optimization issues, at http://devmysqlcom/doc/refman/51/ en/optimize-overviewhtml Extensive information, tips, and techniques to speed up your MySQL queries and make them run more efficiently, at http://devmysqlcom/doc/refman/51/ en/query-speedhtml Information on optimizing server performance, at http://devmysqlcom/doc/ refman/51/en/optimizing-the-serverhtml The MySQL Benchmark Suite, at http://devmysqlcom/doc/refman/51/en/ mysql-benchmarkshtml The MySQL Performance blog, at http://wwwmysqlperformanceblogcom
PARTIII PART PART
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Part II
administration
ChaPter 10 Performing Basic Server Administration ChaPter 11 Managing Users and Controlling Access ChaPter 12 Performing Maintenance, Backup, and Recovery ChaPter 13 Replicating Data aPPendIx a Installing MySQL and the Sample Database
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ChaPter 10
Performing Basic Server administration
Part II:
Administration
revious chapters of this book have focused more on using MySQL for day-to-day work creating databases and running queries, defining triggers and events, building stored routines than on the administrative end of things managing security, assigning user privileges, and backing up data More and more often, however, and especially where open-source products are concerned, users are also administrators, responsible for all aspects of system performance, reliability, and data security In these cases, merely understanding the intricacies of SQL queries is not sufficient Users also need to know how to administer a MySQL RDBMS and take over responsibility for ensuring that MySQL services are always available to users of the system This role involves a number of different facets: securing the MySQL server against unauthorized usage or mischief, assigning users privileges appropriate to their intended use of the system, performing regular checks and backups of the MySQL databases to avoid data corruption or loss, and optimizing the server to ensure that it always delivers the best performance possible The next few chapters will explore the different aspects of MySQL server administration, showing you how to accomplish common tasks quickly and efficiently This chapter serves as a brief introduction to the topic, covering common tasks like starting and stopping the server, obtaining server status, altering server configuration, and using the MySQL log files It also discusses one of the major new features in MySQL 5x, the information_schema database, which provides run-time access to information about database objects
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