A little housekeeping is required to reclaim the space
Navigate to /var/lib/mysql and see how far the logs goes to
Then run
mysql -u root -p ‘MyPassword’ -e “PURGE BINARY LOGS TO ‘mysql-bin.0000x’;” to purge the logs
A little housekeeping is required to reclaim the space
Navigate to /var/lib/mysql and see how far the logs goes to
Then run
mysql -u root -p ‘MyPassword’ -e “PURGE BINARY LOGS TO ‘mysql-bin.0000x’;” to purge the logs
In order to compile PHP on a 64 bit platform, you will need to include the following configure option
–with-libdir=lib64
SELECT * FROM t1 AS t
WHERE 2 = (SELECT COUNT(*) FROM t1 WHERE t1.id = t.id);
To delete a table that has a foreign key constraint, you will get the following error.
Cannot delete or update a parent row: a foreign key constraint fail
You can temporarily disable the foreign key referential check by the following command.
SET foreign_key_checks = 0;
drop table xxx;
SET foreign_key_checks = 1;
When you import a table with Unique key index and contains duplicated rows, you can use the following steps to get around the error.
#1062 – Duplicate entry ‘xxxxxxx’ for key 1
1. Drop the Unique Index on the table.
ALTER TABLE table_name DROP INDEX index_name
2. Import data
3. Create the Unique Index
ALTER IGNORE TABLE `table_name` ADD UNIQUE INDEX `index_name` (`column_name`);
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This show you how to backup and restore mysql db.
Export
mysqldump -u root -h localhost -p db_name > db_name
Import
mysql -u mysql_account-p -h localhost db_name< db_name
CREATE USER 'xxx'@'%' IDENTIFIED BY 'yyy';
GRANT USAGE ON * . * TO 'xxx'@'%' IDENTIFIED BY 'yyy' WITH MAX_QUERIES_PER_HOUR 0 MAX_CONNECTIONS_PER_HOUR 0 MAX_UPDATES_PER_HOUR 0 MAX_USER_CONNECTIONS 0 ;
CREATE DATABASE IF NOT EXISTS `xxx` ;
GRANT ALL PRIVILEGES ON `xxx` . * TO 'xxx'@'%';
Use this to repair a corrupted Index File (.MYI). In this mode, MySQL re-creates the .MYI
file using information from the .frm
file
REPAIR TABLE tbl USE_FRM
./configure \
--with-charset=utf8 \
--with-extra-charsets=big5,gb2312 \
--prefix=/usr/local/mysql \
--enable-local-infile \
--enable-thread-safe-client
make
make install
choose correct config file
cp support-files/my-xxxxx.cnf /etc/my.cnf
./scripts/mysql_install_db
useradd -s /sbin/nologin mysql
chown -R mysql /usr/local/mysql/var
cp support-files/mysql.server /etc/rc.d/init.d/mysqld
chmod 755 /etc/rc.d/init.d/mysqld
chkconfig --add mysqld
chkconfig --level 3 mysqld on
change root password
/usr/local/mysql/bin/mysqladmin -u root password ‘new-password’
# To Strip mysqld yeilding up to 4% performance gain.
strip /usr/local/mysql/libexec/mysqld
edit /etc/rc.d/init.d/mysqld
add --skip-name-resolve to $bindir/mysqld_safe --datadir=$datadir --pid-file=$pid_file
Mount the file system with noatime
/dev/VolGroup00/LogVol04 /usr/local/mysql/var ext3 rw,noatime 1 2