Linux T&T » Mysql

Reducing ibdata1 in mysql

WladyX — Mon, 23 Jan 2012 13:00:00 +0000

/etc/mysql/my.cnf:
innodb_file_per_table

Dump all databases by calling:

/usr/bin/mysqldump --extended-insert --all-databases --add-drop-database --disable-keys --flush-privileges --quick --routines --triggers > all-databases.sql

Stop the MySQL server;
Rename or remove (in case you’ve already backed it up) the MySQL data directory and create an empty one with the same name and permissions;
Make the appropriate changes in my.cnf;
Re-initialize the database with the following command (replace the ‘mysqld‘ with the login of the user your MySQL server runs as) (10x, Påven):

sudo -u mysqld mysql_install_db

Start the MySQL server;
Get into the ‘mysql‘ console and type:

SET FOREIGN_KEY_CHECKS=0;
SOURCE all-databases.sql;
SET FOREIGN_KEY_CHECKS=1;

Restart the MySQL server. (10x, czaby)

At this point everything should be fine and you can test it by starting again the services that use MySQL.

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Strange character appearances in old posts (after db restore)

WladyX — Thu, 29 Dec 2011 12:20:29 +0000

wp-config.php:
define('DB_CHARSET', 'utf8');

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Export the privileges from MySQL and then import to a new server

WladyX — Thu, 29 Dec 2011 12:19:01 +0000

.bashrc:
mygrants() { mysql -B -N $@ -e "SELECT DISTINCT CONCAT( 'SHOW GRANTS FOR ''', user, '''@''', host, ''';' ) AS query FROM mysql.user" | \ mysql $@ | \ sed 's/$GRANT .*$/\1;/;s/^$Grants for .*$/## \1 ##/;/##/{x;p;x;}' }

mygrants --host=prod-db1 --user=admin --password=secret | grep rails_admin | mysql --host=staging-db1 --user=admin --password=secret
mygrants --password=xxx> /mysql.grant

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DBeaver – free universal database tool

WladyX — Thu, 29 Sep 2011 09:34:22 +0000

Supported (tested) databases:

MySQL
Oracle
PostgreSQL
IBM DB2
Microsoft SQL Server
Sybase
ODBC
Java DB (Derby)
Firebird (Interbase)
HSQLDB
SQLite
Mimer
H2
IBM Informix
SAP MAX DB
Cache
Ingres
Linter
Any JDBC compliant data source

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Wildcard – Grant Permissions To A Set Of Databases Matching A Pattern In MysQL

WladyX — Fri, 22 Jul 2011 10:30:01 +0000

GRANT ALL PRIVILEGES ON `database_%` . * TO 'user'@'localhost' WITH GRANT OPTION ;

Duplicate mysql database

WladyX — Thu, 25 Nov 2010 11:32:16 +0000

$ mysqldump -u root -p dbname >~/db_name.sql

$ mysql -u root -pmypassword Welcome to the MySQL monitor. Commands end with ; or g. Your MySQL connection id is 812 Server version: 5.1.20-beta-log FreeBSD port: mysql-server-5.1.20

Type ‘help;’ or ‘h’ for help. Type ‘c’ to clear the buffer.

mysql> create database dbname_copy
mysql> use dbname_copy
mysql> source ~/db_name.sql

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