xtrabackup | 易学教程

1.记录备份开始时，InnoDB存储引擎重做日志文件检查点的LSN

2.复制共享表空间文件以及独立共享表空间文件。

3.记录复制完表空间文件后，InnoDB存储引擎重做日志文件检查点的LSN。

4.复制在备份时产生的重做日志。

优点：

1.在线备份，不阻塞任何的SQL语句。

2.备份性能好，备份的实质是复制数据库文件和重做日志文件。

3.支持压缩备份，通过选项，可以支持不同级别的压缩。

下载地址：

https://www.percona.com/downloads/XtraBackup/LATEST/

[root@zstedu bin]# ./xtrabackup --version
xtrabackup: recognized server arguments:
./xtrabackup version 2.4.12 based on MySQL server 5.7.19 Linux (x86_64) (revision id: 170eb8c)
完全备份

xtrabackup: recognized server arguments:
xtrabackup: recognized client arguments: --backup=1 --socket=/tmp/mysql3306.sock --user=root --password
Enter password:

180708 21:30:53 Connecting to MySQL server host: localhost, user: root, password: set, port: not set, socket: /tmp/mysql3306.sock
Using server version 5.7.22-log
./xtrabackup version 2.4.12 based on MySQL server 5.7.19 Linux (x86_64) (revision id: 170eb8c)
xtrabackup: uses posix_fadvise().
xtrabackup: cd to /data/mysql/mysql3306/data/
xtrabackup: open files limit requested 0, set to 1024
xtrabackup: using the following InnoDB configuration:

InnoDB: Number of pools: 1
180708 21:30:53 >> log scanned up to (3466946626)
xtrabackup: Generating a list of tablespaces
InnoDB: Allocated tablespace ID 62 for mysql/time_zone_transition, old maximum was 0
180708 21:30:54 [01] Copying ./ibdata1 to /data/soft/percona-xtrabackup-2.4.12-Linux-x86_64/bin/xtrabackup_backupfiles/ibdata1
180708 21:30:54 >> log scanned up to (3466946626) 记录了重做日志的位置，然后对备份的InnoDB存储引擎表的物理文件，即共享表空间和独立表空间进行copy操作
180708 21:30:55 >> log scanned up to (3466946626)
180708 21:30:56 >> log scanned up to (3466946626)
180708 21:30:57 >> log scanned up to (3466946626)
180708 21:30:59 >> log scanned up to (3466946626)
180708 21:31:00 >> log scanned up to (3466946626)

。。。。。。。。。。。。。。。。。。。。。。。。。

180708 21:35:13 Finished backing up non-InnoDB tables and files 180708 21:35:13 [00] Writing /data/backup/xtrabackup_binlog_info

180708 21:35:13 Executing FLUSH NO_WRITE_TO_BINLOG ENGINE LOGS... xtrabackup: The latest check point (for incremental): ‘3466946617‘ xtrabackup: Stopping log copying thread. .

180708 21:35:13 >> log scanned up to (3466946626)

180708 21:35:13 Executing UNLOCK TABLES

180708 21:35:13 All tables unlocked

180708 21:35:13 [00] Copying ib_buffer_pool to /data/backup/ib_buffer_pool

=========================================增量备份=========================================================================

（1）完全备份，指定备份目录：

（2）增量备份：

180708 21:38:21 Finished backing up non-InnoDB tables and files 180708 21:38:21 [00] Writing /data/backup/1/xtrabackup_binlog_info

180708 21:38:21 Executing UNLOCK TABLES

180708 21:38:21 All tables unlocked

180708 21:38:21 [00] Copying ib_buffer_pool to /data/backup/1/ib_buffer_pool

180708 21:38:21 [00] Writing /data/backup/1/xtrabackup_info