MySQL System Administration in .NET

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MySQL System Administration
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Once the database server is running and the database is in use, paying periodic attention to a few critical details can ensure that the data remains available to those who need it and closed to those who do not Scheduling frequent backups and keeping transaction logs can help users recover quickly from disasters, either man-made or natural A properly configured security profile can help control who can see the data and what they can do with it
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The safe_mysqld script will start the server safely with standard settings and can restart it after a system restart or a crash To start a server with individual options, a user can employ the mysqld program directly, edit options into the safe_mysqld script, or use the safe_mysqld script as a model for building a customized startup script The mysqld program is usually stored under the libexec directory of the MySQL base install directory The general usage is:
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Usage: mysql [OPTIONS] [database]
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To start mysql, type:
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[root@sairlinuxcarecom Apache]# mysql Welcome to the MySQL monitor Commands end with ; or \g Your MySQL connection id is 7 to server version: 32323-beta-log Type 'help;' or '\h' for help mysql>
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By typing \h at the mysql> prompt, the following general commands are displayed:
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MySQL commands: Note that all text commands must be first on line and end with the ';' Help (\h) Display this text (\ ) Synonym for "help" clear (\c) Clear command connect (\r) Reconnect to the server Optional arguments are db and host edit (\e) Edit command with $EDITOR exit (\q) Exit mysql Same as quit go (\g) Send command to mysql server ego (\G) Send command to mysql server; display result vertically print (\p) Print current command quit (\q) Quit mysql rehash (\#) Rebuild completion hash source (\) Execute a SQL script file Takes a file name as an argument status (\s) Get status information from the server
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System Administration
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use (\u) Connection id: 7 mysql> Use another database Takes database name as argument Can be used with mysqladmin kill
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Type mysql -h to view available options for the mysql command The MySQL command syntax is as follows:
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# mysqld <options>
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where options can be any of the previously listed values To shut down the MySQL server, use the mysqladmin command with the shutdown parameter:
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# mysqladmin shutdown p
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Making Backups of Your Data
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Backing up data is one of the first principles of survival when using a computer A backup (if done properly) can protect data from a range of problems, from a system crash (is the power cord where someone might trip over it ) to an act of vandalism (is there a government building anywhere nearby that might be subject to a terrorist attack ) to a weather problem (how much snow did you say the roof can support ) All of these events have occurred in recent years; even the most reliable system might not be able to continue operating under extreme conditions Backing up data and keeping the backup at a different location can make a world of difference in how long a system is down if something unexpected happens There are two ways to make a backup Because MySQL uses common data files in the Linux file system (unlike some optional configurations on large commercial databases), a backup can be performed by copying all table files (*frm, *MYD, and *MYI) at a time when the server is not updating anything Updates can be prevented during the file system-level backup by doing a LOCK TABLES/UNLOCK TABLES set of commands A read lock will allow queries to continue during the backup, while disallowing updates Backing up with the mysqldump command will allow updates to take place during the backup To be able to capture the updates, first stop mysqld and then start it with the --log-update option This example assumes that log-update is not already turned on:
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