PHP MySQL - Stilson.net

www.it-ebooks.infoCHAPTER 27 • THE MANY MYSQL CLIENTSnumber of slow-executing queries that have taken place on the server. Start by creating a user with nopassword, granting the user only usage privileges on the mysql database. Then, create a file namedmysqlmon.sql and add the following line to it:SHOW STATUS LIKE "slow_queries";Then, if you’re running MySQL on Linux, place the following line into crontab:0 3 * * * mysql -u monitor < mysqlmon.sql | mail -s "Slow queries" jason@example.comEach time this command executes, an e-mail titled “Slow queries” will be sent tojason@example.com at 3 a.m. each morning. The e-mail body will contain a number consisting of thevalue of the status variable slow_query.If you’re running Windows, you can use the Event Scheduler to similar ends.Incidentally, you can also execute a file while already logged into the mysql client, by using thesource command:mysql>source mysqlmon.sqlUseful mysql TipsThis section enumerates several useful tips that all MySQL users should know when starting out with themysql client.Paging OutputYou can view output one screenful at a time using your operating system’s paging commands. Forexample:%>mysql < queries.sql | moreDisplaying Results VerticallyUse the \G option to display query results in a vertical output format. This renders the returned data in asignificantly more readable fashion. Consider this example in which all rows are selected from the mysqldatabase’s db table by using the \G option:mysql>use mysql;mysql>select * from db\G*************************** 1. row ***************************Host: %Db: test%User:Select_priv: YInsert_priv: YUpdate_priv: Y…*************************** 2. row ***************************...509