【MySQL数据迁移】mydump&mydumper

• mysqldump使用场景

1、导出多张表 

mysqldump -uroot -pdbpasswd dbname test1 test2 test3 --single-transaction >db.sql;

2、导出where条件的数据，并加gzip压缩

mysqldump -uname -ppwd dbname tbname --single-transaction --where="id>10" | gzip > backupfile.sql.gz

相应的导入：

gunzip解压：

gunzip < backupfile.sql.gz | mysql -uusername -ppassword databasename 

3、数据库的备份 

mysqldump -uadmin -p'xxx' -B --quick --single-transaction --set-gtid-purged=OFF -R -E --triggers zedb > zedb.`date +"%Y-%m-%d"`.sql
数据迁移：带 --set-gtid-purged=OFF
数据备份：不带 --set-gtid-purged=OFF

多个数据库的备份

mysqldump -uroot -p -S /data/mysql/tmp/mysql.sock  -B --quick --single-transaction --set-gtid-purged=OFF -R -E --triggers --databases db1 db2  > 41.`date +"%Y-%m-%d"`.sql

4、mysqldump导出全部数据

mysqldump -uroot -p --master-data=2 --single-transaction -R -E --triggers -A -q > all.sql

其中--master-data=2代表备份时刻记录master的Binlog位置和Position，--single-transaction意思是获取一致性快照，-R意思是备份存储过程和函数，--triggres的意思是备份触发器，-A代表备份所有的库。更多信息请自行mysqldump --help查看。

导出文本为csv格式

mysql -udba -pXZ5rjoVvWrPp --socket=/data/mysql_3309/mysql.sock

-e "SELECT id_card,adjust_amount,get_package_time from houbank_applet.t_applet_package_user INTO OUTFILE \"/var/lib/mysql-files/test.csv\" FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '\"' LINES TERMINATED BY '\n';"

select into outfile用法

SELECT ... FROM TABLE_A INTO OUTFILE "/path/to/file" FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' LINES TERMINATED BY '\n';

load data infile用法

LOAD DATA INFILE "/path/to/file" INTO TABLE table_name; 注意：如果导出时用到了FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' LINES TERMINATED BY '\n'语句，那么LODA时也要加上同样的分隔限制语句。还要注意编码问题。

导出文本为txt格式

mysql -udba -pXZ5rjoVvWrPp --socket=/data/mysql_3309/mysql.sock

-e "SELECT id_card,adjust_amount,get_package_time from houbank_applet.t_applet_package_user;" > /root/scripts/output/user01.txt

• mydumper/myloader用法

$ mydumper -u admin -p "Password" -h 10.10.10.10 -P 3306 -C -c --trx-consistency-only -t 10 -G -E -R -B employee -o /home/mysql/tempbackup/
$ myloader -t 15 -v 3 -C -o -u -p --directory='/home/mysql/tempbackup/'