如何从一个Dump文件中获取一个、甚至多个表记录

假设有这么一个场景需要从一个50GB的Dump中提取一张表或者多张表怎么办呢?使用Linux的Grep、Sed还是AWK呢?

这里使用MySQL自带的mysql_find_rows来实现,下面做个演示说明一下

首先导出mysql库(使用mysql做演示)

[mysql@localhost ~]$ mysqldump -uroot -pxxxxx --databases mysql > mysql.sql

使用mysql_find_rows查找func表

[mysql@localhost ~]$ mysql_find_rows --regexp 'func' mysql.sql  | more

--
-- Table structure for table `func`
--

DROP TABLE IF EXISTS `func`;
CREATE TABLE `func` (
  `name` char(64) COLLATE utf8_bin NOT NULL DEFAULT '',
  `ret` tinyint(1) NOT NULL DEFAULT '0',
  `dl` char(128) COLLATE utf8_bin NOT NULL DEFAULT '',
  `type` enum('function','aggregate') CHARACTER SET utf8 NOT NULL,
  PRIMARY KEY (`name`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='User defined functions';

--

如果碰巧要找的表在很多其它表或者列中都包含要查找的表的表明关键字怎么办?可以用下面的方式实现
[mysql@localhost ~]$ mysql_find_rows --regexp '`user`' mysql.sql  | more

--
-- Table structure for table `user`
--

DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `Host` char(60) COLLATE utf8_bin NOT NULL DEFAULT '',
  `User` char(16) COLLATE utf8_bin NOT NULL DEFAULT '',
  `Password` char(41) CHARACTER SET latin1 COLLATE latin1_bin NOT NULL DEFAULT '',
  `Select_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Insert_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Update_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Delete_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Create_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Drop_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Reload_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Shutdown_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Process_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `File_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Grant_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `References_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Index_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Alter_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Show_db_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Super_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Create_tmp_table_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Lock_tables_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Execute_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Repl_slave_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Repl_client_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Create_view_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Show_view_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Create_routine_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Alter_routine_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Create_user_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Event_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Trigger_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `Create_tablespace_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  `ssl_type` enum('','ANY','X509','SPECIFIED') CHARACTER SET utf8 NOT NULL DEFAULT '',
  `ssl_cipher` blob NOT NULL,
  `x509_issuer` blob NOT NULL,
  `x509_subject` blob NOT NULL,
  `max_questions` int(11) unsigned NOT NULL DEFAULT '0',
  `max_updates` int(11) unsigned NOT NULL DEFAULT '0',
  `max_connections` int(11) unsigned NOT NULL DEFAULT '0',
  `max_user_connections` int(11) unsigned NOT NULL DEFAULT '0',
  `plugin` char(64) COLLATE utf8_bin DEFAULT '',
  `authentication_string` text COLLATE utf8_bin,
  `password_expired` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
  PRIMARY KEY (`Host`,`User`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='Users and global privileges';

这样就可以过滤掉了.我们只需要user表.^_^

mysql_find_rows指定从某行开始

mysql_find_rows --start_row=100 mysql.sql --这样就会从100行开始输出

参数--rows=#类似不在重复举例

mysql_find_rows英文参数解释
[mysql@localhost ~]$ mysql_find_rows --help
/usr/local/mysql/bin/mysql_find_rows  Ver 1.02

Prints all SQL queries that matches a regexp or contains a 'use
database' or 'set ..' command to stdout.  A SQL query may contain
newlines.  This is useful to find things in a MySQL update log.

/usr/local/mysql/bin/mysql_find_rows takes the following options:

--help or --Information
  Shows this help

--regexp=#
  Print queries that matches this.

--start_row=#
  Start output from this row (first row = 1)

--skip-use-db
  Don't include 'use database' commands in the output.

--rows=#
  Quit after this many rows.

原文的英文例子
Example:

/usr/local/mysql/bin/mysql_find_rows --regexp "problem_table" < update.log

/usr/local/mysql/bin/mysql_find_rows --regexp "problem_table" update-log.1 update-log.2