building your first myspace application

... Shared libraries used by various applications and languages to communicate with MySQL MySQL-shared-compat This package is a replacement for MySQL-shared if your application requires libraries from ... hazardous to your data or systems xxviii Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark Introduction Tips generally are used to provide information that can make your work ... MySQL has long been used in dynamic websites and applications Whether you program in Perl, PHP, ASP, NET or Ruby you can integrate MySQL into your environment MySQL Mission — Speed, Reliability,...

Ngày tải lên: 21/01/2014, 13:20

... change listed for the tables for MySQL Backup logging If your application uses MySQL Backup the upgrade could cause a problem in the way your application works Take the time to read and understand ... back up your old mysqld before installing a newer one For example, if you are using version 6.0.6 and want to upgrade to 6.0.8, rename your current binary from mysqld to mysqld-6.0.6 If your new ... they will affect your setup Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark 45 Part I First Steps with MySQL ■ Create a logical backup (export) of your data before...

Ngày tải lên: 21/01/2014, 13:20

... mysql> SELECT first_ name FROM staff WHERE first_ name LIKE ’M%’; + + | first_ name | + + | Mike | + + row in set (0.00 sec) mysql> SELECT first_ name FROM staff WHERE first_ name LIKE ... simply going to the following URL in your browser: http://yourserverip/phpmyadmin You will need to replace yourserverip with the hostname or IP address of your web server You will be presented ... SELECT staff_id, staff_id>1, ’|’, -> first_ name, first_ name LIKE ’M%’ -> FROM staff; + + + -+ + + | staff_id | staff_id>1 | | | first_ name | first_ name LIKE ’M%’ | + + ...

Ngày tải lên: 21/01/2014, 13:20

... command, you can try rebuilding the table using an ALTER TABLE table_name ENGINE = storage_engine command, which will force a rebuild of the data and indexes Like REPAIR TABLE, rebuilding the data ... In this way, taking a database offline for maintenance does not require noticeable downtime for your application This tip is extremely useful for proactive maintenance such as upgrading mysqld Using ... may only abort the connection, not the query itself! It is important to always double-check that your expectations match reality After using the KILL command, run a SHOW PROCESSLIST to ensure that...

Ngày tải lên: 21/01/2014, 13:20

... present a good optimal data type For example, the sakila.staff table defines the first_ name and last_name fields as: `first_ name` varchar(45) NOT NULL `last_name` varchar(45) NOT NULL What does PROCEDURE ... the optimal data type for these fields? mysql> SELECT COUNT (first_ name),COUNT(last_name) FROM staff; + -+ + | COUNT (first_ name) | COUNT(last_name) | + -+ + | | ... (0.00 sec) mysql> SELECT first_ name, last_name -> FROM staff PROCEDURE ANALYSE(16)\G *************************** row *************************** Field_name: sakila.staff .first_ name Min_value: Jon...

Ngày tải lên: 21/01/2014, 13:20

... table from your second connection: my2> SELECT id,name FROM lock_test; When you attempt to this your SELECT statement will be blocked waiting for the release of the write lock acquired by your first ... to vary greatly depending on your application If the entire database is Gb in size and will not increase over time, the server does not need Gb of RAM However, many applications have databases ... one scheduler over another If you have time, benchmark your application with the different schedulers and determine which one is best for your needs If you have a good quality RAID controller,...

Ngày tải lên: 21/01/2014, 22:20

... storage engines in a single application This ability to use multiple storage engines can lead to optimal results for the application This is because different parts of the application will have different ... Engines writes to a MyISAM table can be problematic If your application has a lot of write activity, the writes will end up blocking the reads and your database server might exhibit a high number of ... features Because you have such flexibility and choice with MySQL Server, you should carefully weigh your application s requirements before selecting a particular storage engine for use Though it is...

Ngày tải lên: 21/01/2014, 22:20

... 10,193: 15,593 / (15,593 + 10,193) = 60470 = 60.47% Depending on your application, this can be a good hit ratio or not If your application has many different SELECT statements, or if many statements ... cache You this via application code In each place that your application queries the database, add in a check of the cache in memcached first If memcached returns nothing, the application must then ... the storage engine that best fits the needs of your application You even have the choice of having more than one storage engine at the same time in your database, and having a table on a slave...

Ngày tải lên: 21/01/2014, 22:20

... Administration Edit your /etc/my.cnf file Under [myqld] add init-file=/home/kmurphy/ mysql-init Shut down the MySQL server in your normal manner Start the MySQL server in your normal manner The ... click on 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 ... to carry out for various scenarios Summary You have multiple methods of backing up your data, and depending on your situation, some options are going to be better than others Do not underestimate...

Ngày tải lên: 21/01/2014, 22:20

... include testing your database performance with server configuration changes, testing your database for deadlock handling, testing different methods of loading data, and testing new application code ... begin with The next values would be 11 on Server A and 12 on Server B It is not wise to have your application write to both servers at the same time Writing to both servers at the same time makes ... rotate your log file If you are using a non–Red Hat system you can create Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark 523 16 Part III Core MySQL Administration your...

Ngày tải lên: 21/01/2014, 22:20

... filtering Please enter your MySQL administrative login: username Please enter your MySQL administrative password: You not need SUPER privileges in order to run the script After entering your password, ... great deal of information about your queries While these queries were very simple and did not return much data, it could be useful to determine what some of your application s potential ‘‘trouble ... a lot, depending on your overall server usage If mysqld has a lot of write activity that primarily executes INSERT and UPDATE statements, then Write hit may be very low If your server has a high...

Ngày tải lên: 21/01/2014, 22:20

... changed and combined to fit your needs For example, if your application allows end users to upload files to be loaded into the database, it would be completely appropriate for the Application role to ... appropriate for a DBA who also debugs an application and administers the application schema to have ALL PRIVILEGES However, there is very little reason a web-based application needs to be able to create ... customer (first_ name, last_name) VALUES ( $first_ name, $last_name); When a user inserts the expected values into the form, the variables are populated and the query expands: INSERT INTO customer (first_ name,...

Ngày tải lên: 21/01/2014, 22:20

... tables — in this way, sharding your application is possible without having to change application code There is no sample script for this, because it is highly application- dependent However, it ... architecture design to change, so even if you plan the best solution for your application, the requirements may change based on how the application is used Through measurement, planning, flexibility, and ... read queries, you can point the application at the server running mysql-proxy and your read queries are now load-balanced Adding and removing servers means that application code does not need...

Ngày tải lên: 21/01/2014, 22:20

... table from your second connection: my2> SELECT id,name FROM lock_test; When you attempt to this your SELECT statement will be blocked waiting for the release of the write lock acquired by your first ... to vary greatly depending on your application If the entire database is Gb in size and will not increase over time, the server does not need Gb of RAM However, many applications have databases ... one scheduler over another If you have time, benchmark your application with the different schedulers and determine which one is best for your needs If you have a good quality RAID controller,...

Ngày tải lên: 26/01/2014, 11:20

... storage engines in a single application This ability to use multiple storage engines can lead to optimal results for the application This is because different parts of the application will have different ... Engines writes to a MyISAM table can be problematic If your application has a lot of write activity, the writes will end up blocking the reads and your database server might exhibit a high number of ... features Because you have such flexibility and choice with MySQL Server, you should carefully weigh your application s requirements before selecting a particular storage engine for use Though it is...

Ngày tải lên: 26/01/2014, 11:20

... 10,193: 15,593 / (15,593 + 10,193) = 60470 = 60.47% Depending on your application, this can be a good hit ratio or not If your application has many different SELECT statements, or if many statements ... cache You this via application code In each place that your application queries the database, add in a check of the cache in memcached first If memcached returns nothing, the application must then ... the storage engine that best fits the needs of your application You even have the choice of having more than one storage engine at the same time in your database, and having a table on a slave...

Ngày tải lên: 26/01/2014, 11:20