Starting from MySQL 5, when you execute show databases command, information_schema will be listed in the database list. information_schema is a virtual MySQL database that stores metadata information of all the MySQL databases. Typically you will execute either DESCRIBE or SHOW commands to get the metadata information. However using the information_schema views, you can execute [...]
MySQL
Bugzilla, an open source bug tracking system uses MySQL for the database. When you try to attach a document to the bug that is greater than 1MB in size, you will get the error message shown below. This article explains how to fix this problem by changing the MySQL max_allowed_packet database parameter and bugzilla maxattachmentsize [...]
Uploading several rows of data from a text, csv, and excel file into a MySQL table is a routine task for sysadmins and DBAs who are managing MySQL database. This article explains 4 practical examples on how to import data from a file to MySQL table using both mysqlimport and “load data local infile” method. [...]
mysqldump is an effective tool to backup MySQL database. It creates a *.sql file with DROP table, CREATE table and INSERT into sql-statements of the source database. To restore the database, execute the *.sql file on destination database. For MyISAM, use mysqlhotcopy method that we explained earlier, as it is faster for MyISAM tables. Using [...]
Previously we discussed about how to install Apache and PHP from source. Installing LAMP stack from source will give you full control to configure different parameters. Installing LAMP stack using yum is very easy and takes only minutes. This is a good option for beginners who don’t feel comfortable installing from source. Also, Installing LAMP [...]
MyISAM is the default storage engine for MySQL database. MyISAM table gets corrupted very easily. In this article, I’ll explain how to use myisamchk to identify and fix table corruption in MyISAM. When a table is created under MySQL, it creates three different files: *.frm file to store table format, *.MYD (MyData) file to store [...]
Most of the open source application uses MySQL database. To debug an issue with the open source application, it is very important to understand how to quickly get high level information about your MySQL database. In this article, I have explained how you can view the database, table, column and index information on any MySQL [...]
mysqlhotcopy is a perl script that comes with MySQL installation. This locks the table, flush the table and then performs a copy of the database. You can also use the mysqlhotcopy to automatically copy the backup directly to another server using scp . 1. mysqlhotcopy command: [local-host]# /usr/bin/mysqlhotcopy -u root -p My2Secure$Password sugarcrm /home/backup/database --allowold [...]
My name is Ramesh Natarajan. I will be posting instruction guides, how-to, troubleshooting tips and tricks on Linux, database, hardware, security and web. My focus is to write articles that will either teach you or help you resolve a problem. Read more about