mysqldump原理1

http://blog.csdn.net/linwaterbin/article/category/1299332 


mysqldump -S /tmp/mysql.sock --single-transaction --force  --databases test > v1.sql 

[root@localhost data]# cat v1.sql  
-- MySQL dump 10.13  Distrib 5.6.28, for Linux (x86_64)
--
-- Host: localhost    Database: test
-- ------------------------------------------------------
-- Server version       5.6.28-debug-log

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;

--
-- Current Database: `test`
--

CREATE DATABASE /*!32312 IF NOT EXISTS*/ `test` /*!40100 DEFAULT CHARACTER SET utf8mb4 */;

USE `test`;

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

DROP TABLE IF EXISTS `user`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `user` (
  `id` varchar(20) NOT NULL,
  `name` varchar(20) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `user`
--

LOCK TABLES `user` WRITE;
/*!40000 ALTER TABLE `user` DISABLE KEYS */;
INSERT INTO `user` VALUES ('1','Michael');
/*!40000 ALTER TABLE `user` ENABLE KEYS */;
UNLOCK TABLES;
/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

-- Dump completed on 2016-07-08  6:12:19

 general_log:生成的日志

[root@localhost data]# cat localhost.log
mysqld, Version: 5.6.28-debug-log (Source distribution). started with:
Tcp port: 3306  Unix socket: /tmp/mysql.sock
Time                 Id Command    Argument
160708  6:12:18     8 Connect   root@localhost on 
                    8 Query     /*!40100 SET @@SQL_MODE='' */
                    8 Query     /*!40103 SET TIME_ZONE='+00:00' */
                    8 Query     SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ       RR级别
                    8 Query     START TRANSACTION /*!40100 WITH CONSISTENT SNAPSHOT */        开始一个事务
                    8 Query     SHOW VARIABLES LIKE 'gtid\_mode'
                    8 Query     UNLOCK TABLES
                    8 Query     SELECT LOGFILE_GROUP_NAME, FILE_NAME, TOTAL_EXTENTS, INITIAL_SIZE, ENGINE, EXTRA FROM INFORMATION_SCHEMA.FILES WHERE FILE_TYPE = 'UNDO LOG' AND FILE_NAME IS NOT NULL AND LOGFILE_GROUP_NAME IN (SELECT DISTINCT LOGFILE_GROUP_NAME FROM INFORMATION_SCHEMA.FILES WHERE FILE_TYPE = 'DATAFILE' AND TABLESPACE_NAME IN (SELECT DISTINCT TABLESPACE_NAME FROM INFORMATION_SCHEMA.PARTITIONS WHERE TABLE_SCHEMA IN ('test'))) GROUP BY LOGFILE_GROUP_NAME, FILE_NAME, ENGINE ORDER BY LOGFILE_GROUP_NAME
                    8 Query     SELECT DISTINCT TABLESPACE_NAME, FILE_NAME, LOGFILE_GROUP_NAME, EXTENT_SIZE, INITIAL_SIZE, ENGINE FROM INFORMATION_SCHEMA.FILES WHERE FILE_TYPE = 'DATAFILE' AND TABLESPACE_NAME IN (SELECT DISTINCT TABLESPACE_NAME FROM INFORMATION_SCHEMA.PARTITIONS WHERE TABLE_SCHEMA IN ('test')) ORDER BY TABLESPACE_NAME, LOGFILE_GROUP_NAME
                    8 Query     SHOW VARIABLES LIKE 'ndbinfo\_version'
                    8 Init DB   test
                    8 Query     SHOW CREATE DATABASE IF NOT EXISTS `test`
                    8 Query     SAVEPOINT sp                                           //   save sp
                    8 Query     show tables
                    8 Query     show table status like 'user'
                    8 Query     SET SQL_QUOTE_SHOW_CREATE=1
                    8 Query     SET SESSION character_set_results = 'binary'
                    8 Query     show create table `user`
                    8 Query     SET SESSION character_set_results = 'utf8'
                    8 Query     show fields from `user`
                    8 Query     SELECT /*!40001 SQL_NO_CACHE */ * FROM `user`
                    8 Query     SET SESSION character_set_results = 'binary'
                    8 Query     use `test`
                    8 Query     select @@collation_database
                    8 Query     SHOW TRIGGERS LIKE 'user'
                    8 Query     SET SESSION character_set_results = 'utf8'
                    8 Query     ROLLBACK TO SAVEPOINT sp
                    8 Query     RELEASE SAVEPOINT sp
160708  6:12:19     8 Quit