mydumper导出和导入有诸多优点，特别是在并行方面，网上文章很多，不做过多解释，不过随着mysqlpump的发布和增强，mydumper在并行方面优势将不复存在，
以下为mydumper的日常使用，仅记录做参考：
mydumper下载地址，直接下载rpm包进行安装：
https://github.com/maxbube/mydumper/releases
以下下载地址已经不推荐：
https://launchpad.net/mydumper
rpm -ivh mydumper-0.9.5-2.el7.x86_64.rpm
查看安装后的文件路径：
[root@db1 soft]# rpm -ql mydumper
/usr/bin/mydumper
/usr/bin/myloader
导出指定的库：
mydumper -u root -h localhost -p MYsql#123 -e -B app --threads=18 -o /root/backup1/ --logfile=mydumper20180108.log
恢复导入：
myloader -u root -p MYsql#123 -h localhost -P 3306 -B app -d /root/backup/ --threads=8
导出指定的表：
mydumper -u root -h localhost -p MYsql#123 -e -B app -T t_bz_sys_users,t_bz_sys_gallery -o /root/backup1/
mydumper导出的文件分为如下几部分：
database_name-schema-create.sql 创建数据库脚本；
database_name.table_name-schema.sql 创建表的脚本
database_name.table_name.sql 具体的数据插入sql语句
metadata SHOW MASTER STATUS信息，相当于mysqldump加上--single-transaction --master-data
mydumper和myloader详细的使用参数请加help：
[root@db2 backup]# mydumper --help
Usage:
mydumper [OPTION?] multi-threaded MySQL dumping
Help Options:
-?, --help Show help options
Application Options:
-B, --database Database to dump
-T, --tables-list Comma delimited table list to dump (does not exclude regex option)
-O, --omit-from-file File containing a list of database.table entries to skip, one per line (skips before applying regex option)
-o, --outputdir Directory to output files to
-s, --statement-size Attempted size of INSERT statement in bytes, default 1000000
-r, --rows Try to split tables into chunks of this many rows. This option turns off --chunk-filesize
-F, --chunk-filesize Split tables into chunks of this output file size. This value is in MB
-c, --compress Compress output files
-e, --build-empty-files Build dump files even if no data available from table
-x, --regex Regular expression for 'db.table' matching
-i, --ignore-engines Comma delimited list of storage engines to ignore
-N, --insert-ignore Dump rows with INSERT IGNORE
-m, --no-schemas Do not dump table schemas with the data
-d, --no-data Do not dump table data
-G, --triggers Dump triggers
-E, --events Dump events
-R, --routines Dump stored procedures and functions
-W, --no-views Do not dump VIEWs
-k, --no-locks Do not execute the temporary shared read lock. WARNING: This will cause inconsistent backups
--no-backup-locks Do not use Percona backup locks
--less-locking Minimize locking time on InnoDB tables.
-l, --long-query-guard Set long query timer in seconds, default 60
-K, --kill-long-queries Kill long running queries (instead of aborting)
-D, --daemon Enable daemon mode
-I, --snapshot-interval Interval between each dump snapshot (in minutes), requires --daemon, default 60
-L, --logfile Log file name to use, by default stdout is used
--tz-utc SET TIME_ZONE='+00:00' at top of dump to allow dumping of TIMESTAMP data when a server has data in different time zones or data is being moved between servers with different time zones, defaults to on use --skip-tz-utc to disable.
--skip-tz-utc
--use-savepoints Use savepoints to reduce metadata locking issues, needs SUPER privilege
--success-on-1146 Not increment error count and Warning instead of Critical in case of table doesn't exist
--lock-all-tables Use LOCK TABLE for all, instead of FTWRL
-U, --updated-since Use Update_time to dump only tables updated in the last U days
--trx-consistency-only Transactional consistency only
--complete-insert Use complete INSERT statements that include column names
-h, --host The host to connect to
-u, --user Username with the necessary privileges
-p, --password User password
-a, --ask-password Prompt For User password
-P, --port TCP/IP port to connect to
-S, --socket UNIX domain socket file to use for connection
-t, --threads Number of threads to use, default 4
-C, --compress-protocol Use compression on the MySQL connection
-V, --version Show the program version and exit
-v, --verbose Verbosity of output, 0 = silent, 1 = errors, 2 = warnings, 3 = info, default 2
--defaults-file Use a specific defaults file
--ssl Connect using SSL
--key The path name to the key file
--cert The path name to the certificate file
--ca The path name to the certificate authority file
--capath The path name to a directory that contains trusted SSL CA certificates in PEM format
--cipher A list of permissible ciphers to use for SSL encryption
[root@db2 backup]# myloader --help
Usage:
myloader [OPTION?] multi-threaded MySQL loader
Help Options:
-?, --help Show help options
Application Options:
-d, --directory Directory of the dump to import
-q, --queries-per-transaction Number of queries per transaction, default 1000
-o, --overwrite-tables Drop tables if they already exist
-B, --database An alternative database to restore into
-s, --source-db Database to restore
-e, --enable-binlog Enable binary logging of the restore data
-h, --host The host to connect to
-u, --user Username with the necessary privileges
-p, --password User password
-a, --ask-password Prompt For User password
-P, --port TCP/IP port to connect to
-S, --socket UNIX domain socket file to use for connection
-t, --threads Number of threads to use, default 4
-C, --compress-protocol Use compression on the MySQL connection
-V, --version Show the program version and exit
-v, --verbose Verbosity of output, 0 = silent, 1 = errors, 2 = warnings, 3 = info, default 2
--defaults-file Use a specific defaults file
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