mysqlfrm使用

【1】下载安装

【1.1】下载

下载官网：https://downloads.mysql.com/archives/utilities/

linux：wget https://downloads.mysql.com/archives/get/p/30/file/mysql-utilities-1.6.5.tar.gz

【1.2】二进制编辑安装

#前置条件，python2.6及以上

tar -xvzf mysql-utilities-1.6.5.tar.gz 
cd mysql-utilities-1.6.5
python ./setup.py build
python ./setup.py install

【1.3】检查是否安装好

mysqlfrm --version

【2】参数介绍与使用

【2.1】参数介绍

--basedir ：如 --basedir=/usr/local/percona-5.6.21

--server ： 如 --server=user:password@192.168.1.100:3306

--diagnostic ： 开启按字节模式来恢复frm结构

--user :启动MySQL用户，通过为mysql

【2.2】使用 --basedir 模式

（1）mysqlfrm --basedir=/usr/local/percona-5.6.21/ /root/t1.frm --port=3434 --user=mysql --diagnostic

# WARNING The --port option is not used in the --diagnostic mode.
# WARNING: The --user option is only used for the default mode.
# WARNING: Cannot generate character set or collation names without the --server option.
# CAUTION: The diagnostic mode is a best-effort parse of the .frm file. As such, it may not identify all of the components of the table correctly. This is especially true for damaged files. It will also not read the default values for the columns and the resulting statement may not be syntactically correct.
# Reading .frm file for /root/t1.frm:
# The .frm file is a TABLE.
# CREATE TABLE Statement:

CREATE TABLE `root`.`t1` (
`a` int(11) NOT NULL, 
`b` int(11) DEFAULT NULL, 
`c` int(11) DEFAULT NULL, 
`d` varchar(600) DEFAULT NULL, 
PRIMARY KEY `PRIMARY` (`a`),
KEY `idx_t1_bc` (`b`,`c`)
) ENGINE=InnoDB;

【2.3】使用--server方式恢复

mysqlfrm --server=user:password@192.168.1.100:3306 /root/t1.frm --port=3434 --user=mysql --diagnostic 

WARNING: Using a password on the command line interface can be insecure.
# WARNING The --port option is not used in the --diagnostic mode.
# WARNING: The --user option is only used for the default mode.
# Source on 192.168.1.100: ... connected.
# CAUTION: The diagnostic mode is a best-effort parse of the .frm file. As such, it may not identify all of the components of the table correctly. This is especially true for damaged files. It will also not read the default values for the columns and the resulting statement may not be syntactically correct.
# Reading .frm file for /root/t1.frm:
# The .frm file is a TABLE.
# CREATE TABLE Statement:

CREATE TABLE `root`.`t1` (
`a` int(11) NOT NULL, 
`b` int(11) DEFAULT NULL, 
`c` int(11) DEFAULT NULL, 
`d` varchar(200) COLLATE `utf8_general_ci` DEFAULT NULL, 
PRIMARY KEY `PRIMARY` (`a`),
KEY `idx_t1_bc` (`b`,`c`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

#...done.

注意到没有，使用--basedir恢复出来的varchar竟然是--server模式的3倍；这应该是mysqlfrm在使用basedir模式时，无法进行字符编码校验所致引起的。

再次看了下--server的文件：(重点看标红加粗的文字），建议：能用--server模式时，尽量使用--server同时保证提供mysqld环境与原生产环境的一致。

--server=server
Connection information for a server. Use this option or --basedir for the default mode. If provided with the diagnostic mode, the storage engine and character set information are validated against this server.