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How to stop mysqld
To find out the start command for mysqld (using a mac) I can do:
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How to execute a MySQL command from a shell script?
...it's tricky because you must have no space between -p and the password.
$ mysql -h "server-name" -u "root" "-pXXXXXXXX" "database-name" < "filename.sql"
If you use a space after -p it makes the mysql client prompt you interactively for the password, and then it interprets the next command argu...
Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
I am getting the following error when I try to connect to mysql:
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ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock'
I installed MySQL on Mac OS X Mountain Lion with homebrew install mysql , but when I tried mysql -u root I got the following error:
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Which is fastest? SELECT SQL_CALC_FOUND_ROWS FROM `table`, or SELECT COUNT(*)
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It depends. See the MySQL Performance Blog post on this subject: To SQL_CALC_FOUND_ROWS or not to SQL_CALC_FOUND_ROWS?
Just a quick summary: Peter says that it depends on your indexes and other factors. Many of the comments to the post seem to...
MySQL error 1449: The user specified as a definer does not exist
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How to change the definer for stored procedures
Example:
UPDATE `mysql`.`proc` p SET definer = 'user@%' WHERE definer='root@%'
Be careful, because this will change all the definers for all databases.
2. Create the missing user
If you've found following error while using MySQL databa...
How to change max_allowed_packet size
I am having a problem with BLOB fields in my MySQL database - when uploading files larger than approx 1MB I get an error Packets larger than max_allowed_packet are not allowed.
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[解决]MySql提示:The server quit without updating PID file(…)失败 - 数...
[解决]MySql提示:The server quit without updating PID file(…)失败服务器症状：今天网站web页面提交内容到数据库，发现出错了，一直提交不了，数找了下原因，发现数据写不进去！第一反应，重启mysql数据库，...服务器症状：
今天网站we...
How to grant remote access to MySQL for a whole subnet?
...imply use a percent sign as a wildcard in the IP address.
From http://dev.mysql.com/doc/refman/5.1/en/grant.html
You can specify wildcards in the host name. For example, user_name@'%.example.com' applies to user_name for any host in the example.com domain, and user_name@'192.168.1.%' applies to...
Difference between natural join and inner join
... definition of a natural join is to join on *all like-named columns*. From MySQL doc: The NATURAL [LEFT] JOIN of two tables is defined to be semantically equivalent to an INNER JOIN or a LEFT JOIN with a USING clause that names all columns that exist in both tables.. And another thing - in practice ...