mysqlfrm使用

【1】下載安裝

【1.1】下載

下載官網：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】二進制編輯安裝

#前置條件，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】檢查是否安裝好

mysqlfrm --version

【2】參數介紹與使用

【2.1】參數介紹

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

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

--diagnostic ： 開啟按字節模式來恢復frm結構

--user :啟動MySQL用戶，通過為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方式恢復

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.

 

注意到沒有，使用--basedir恢復出來的varchar竟然是--server模式的3倍；這應該是mysqlfrm在使用basedir模式時，無法進行字符編碼校驗所致引起的。

再次看了下--server的文件：(重點看標紅加粗的文字），建議：能用--server模式時，盡量使用--server同時保證提供mysqld環境與原生產環境的一致。

--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.