growth and how to deal with it

... Schwartz Morgan Tocker Nicklas Westerlund Vice President and Executive Publisher Barry Pruett Production Editor Liz Britten Copy Editors Kim Cofer Foxxe Editorial Services Editorial Manager Mary ... production As a database administrator, however, it can be prudent to test the beta software and follow its development It is a good idea to be familiar with the features and bug fixes in beta software, ... Executive Editor) for taking a chance on me I hope you weren’t disappointed Without our Development Editor, Ed Connor, I suspect we would have ended up in the ditch — never to get out And thanks to all...

Ngày tải lên: 21/01/2014, 13:20

... net stop MySQL Once mysqld is installed as a service, you can use the Services GUI to start and stop it manually and toggle whether it starts and stops automatically when Windows starts and stops ... database with GUI tools Using GUI tools for special tasks Accessing mysqld with Command-Line Tools Most database administrators use command-line client tools for access and for getting information It ... and can be changed with the \d or delimiter command followed by one character or word The following example shows how to change the delimiter to |, how using ; after the change does not submit...

Ngày tải lên: 21/01/2014, 13:20

... 3-8 All of the initial setup is already done for you Just write your query and click the Execute button to store it on the server You can also examine and edit stored procedures and functions that ... difficult with command-line tools or even impossible, such as with ER diagramming This chapter covered: ■ MySQL command-line tools including: ■ The mysql client ■ The mysladmin tool ■ The mysqlshow tool ... case-insensitive with respect to names of fields, indexes, stored routines and events However, mysqld stores information on the file system and makes assumptions based on the files and directories found...

Ngày tải lên: 21/01/2014, 13:20

... and subpartitions with PARTITION BY, and changing partitioning with ADD PARTITION, DROP PARTITION, COALESCE PARTITION, REORGANIZE PARTITION, ANALYZE PARTITION, CHECK PARTITION, OPTIMIZE PARTITION, ... with- debug: mysql> SHOW FUNCTION CODE sakila.inventory_in_stock; ERROR 1289 (HY000): The ’SHOW PROCEDURE|FUNCTION CODE’ feature is disabled; you need MySQL built with ’ withdebug’ to have it ... position the LOW_PRIORITY option is However, the HIGH_PRIORITY option is only valid with the INSERT statement — the LOW_PRIORITY statement is valid with all DML Both LOW_PRIORITY and HIGH_PRIORITY...

Ngày tải lên: 21/01/2014, 13:20

... and range The BIT data type stores integers as a series of bits The range of a BIT field is determined by the argument to BIT(x) The default range is bit and the range can be set from to 64 bits ... digits = 10 digits = digits + digit digits = bytes digit left over CEILING(1/2) = byte Total integer part = bytes Fractional part = digits CEILING(2/2) = byte Total size = bytes Integer sizes and ... A FLOAT is limited in how many significant digits it can store In the SQL standard, this limitation can be specified as the argument p (p stands for precision) In MySQL, this limitation depends...

Ngày tải lên: 21/01/2014, 13:20

... in itself if AUTOCOMMIT is enabled (AUTOCOMMIT = 1) The result of this is that if AUTOCOMMIT is enabled, which it is by default, mysqld wraps every statement with START TRANSACTION and COMMIT ... COMMITTED and a connection with a session setting of READ UNCOMMITTED The connection with the READ UNCOMMITTED isolation setting will see uncommitted changes, even from connections with uncommitted ... drives either configured with partitions or using a RAID setup to manage a number of drives and make them appear to be a single drive to the server With mysqld, you will have better performance with...

Ngày tải lên: 21/01/2014, 22:20

... beginning with version 5.1, MySQL Server allows a storage engine to be able to create or drop indexes without copying the contents of the entire table However, a storage engine has to write the code to ... MyISAM and InnoDB, and may use others in a handful of projects IN THIS CHAPTER Understanding storage engines Using different storage engines Working with storage engines Understanding Storage ... writes max_write_lock_count Determines how many writes to a table take precedence over reads This could resolve issues with read starvation if there are constant writes to a table This works with...

Ngày tải lên: 21/01/2014, 22:20

... the today field) and the total count of visitors up to today (in the vcount field) With each new visitor, update the visitors_today.count field: UPDATE visitors_today SET today = today + 1; To retrieve ... the total visitor count and a quarter of a second to return the results from the visitor count cache table If there are 100 visitors to a site in 30 minutes, it would take seconds per visitor ... Calculates and stores the total running count in visitors_today.vcount ■ Resets the vistors_today.today field to zero Here is a sample event that updates the current and historic visitor count...

Ngày tải lên: 21/01/2014, 22:20

... it, and then left-click on Stop If your MySQL server is not running as a service, you may need to use the Task Manager to force it to stop With your favorite text editor, create a text file, and ... start-datetime=’YYYY-MM-DD’ or start-position=# and ending place with either stop-datetime=’YYYY-MM-DD’ or stop-position=# To determine the exact position to start or stop you have to examine the binary log ... server is restarted with this option it starts ‘‘wide open’’ with anyone able to log in with all privileges without even specifying a username This is a huge security risk and must be carefully...

Ngày tải lên: 21/01/2014, 22:20

... 10 With Server A, the initial insert into a table (with an auto_increment field) will be with a value of Server B will begin with The next values would be 11 on Server A and 12 on Server B It ... Both logging and replication are critical areas for a database administrator to understand This chapter taught the tools and techniques used to work with replication and ensure it runs reliably ... in the Maatkit toolkit, available at www.maatkit.org All the tools are programmed in Perl with minimal prerequisites Maatkit includes one tool, mk-table-checksum, which you can use to uncover...

Ngày tải lên: 21/01/2014, 22:20

... Write lines describe the total number and average rate of writes to the buffer pool This system is quite busy with write activity, and it is shown here The Flushes line indicates the total and ... tradeoff to using automated tools, which may be acceptable Even if you use an automated tool or tools, knowing how to use SHOW GLOBAL STATUS is a key skill for a database administrator working with ... fragmented With MySQL 5.0 and above, it uses the information_schema database to gather the same information It prints out a list of the total data stored in each table type and ends with a count...

Ngày tải lên: 21/01/2014, 22:20

... host, service and network monitoring ■ Monitoring is done via separate daemons on each machine to be monitored, and each instance is separate It is possible to check remote hosts, but Monit is not ... downtimes However, the graphing capabilities are excellent, and it is the only tool with out-of-the-box monitoring of the MySQL process list and logs Being able to remotely view these, and even ... www.vmware.com/appliances/ directory/372 All this flexibility and customizability comes with a learning curve However, it is not a large learning curve, and there is a ‘‘quickstart’’ guide to setting up Nagios...

Ngày tải lên: 21/01/2014, 22:20

... powerful and flexible due to its simplicity It allows you to intercept queries and results, adding functionality and changing which mysqld process to send information to, what is sent to mysqld, and ... replication, is a way to scale reads As with all replication architectures, it is not a way to scale writes However, with master/master replication, either of the mysqld processes can accept writes, which ... starting with a query tokenizer, using some part of the query to decide which backend the query should go to, and ending with setting the backend of the connection This is how read/write splitting and...

Ngày tải lên: 21/01/2014, 22:20

... in itself if AUTOCOMMIT is enabled (AUTOCOMMIT = 1) The result of this is that if AUTOCOMMIT is enabled, which it is by default, mysqld wraps every statement with START TRANSACTION and COMMIT ... COMMITTED and a connection with a session setting of READ UNCOMMITTED The connection with the READ UNCOMMITTED isolation setting will see uncommitted changes, even from connections with uncommitted ... drives either configured with partitions or using a RAID setup to manage a number of drives and make them appear to be a single drive to the server With mysqld, you will have better performance with...

Ngày tải lên: 26/01/2014, 11:20

... beginning with version 5.1, MySQL Server allows a storage engine to be able to create or drop indexes without copying the contents of the entire table However, a storage engine has to write the code to ... MyISAM and InnoDB, and may use others in a handful of projects IN THIS CHAPTER Understanding storage engines Using different storage engines Working with storage engines Understanding Storage ... writes max_write_lock_count Determines how many writes to a table take precedence over reads This could resolve issues with read starvation if there are constant writes to a table This works with...

Ngày tải lên: 26/01/2014, 11:20

... the today field) and the total count of visitors up to today (in the vcount field) With each new visitor, update the visitors_today.count field: UPDATE visitors_today SET today = today + 1; To retrieve ... the total visitor count and a quarter of a second to return the results from the visitor count cache table If there are 100 visitors to a site in 30 minutes, it would take seconds per visitor ... Calculates and stores the total running count in visitors_today.vcount ■ Resets the vistors_today.today field to zero Here is a sample event that updates the current and historic visitor count...

Ngày tải lên: 26/01/2014, 11:20