mysql .xb数据库备份恢复
https://cloud.tencent.com/document/product/236/33362

备份文件先经过 qpress 压缩，后经过 xbstream 打包

1， 安装 xbstream
yum install http://www.percona.com/downloads/percona-release/redhat/0.1-3/percona-release-0.1-3.noarch.rpm
yum install percona-xtrabackup-24

报错：
https://blog.csdn.net/xinjing2015/article/details/88178789

The GPG keys listed for the "Percona-Release YUM repository - x86_64" repository are already installed but they are not correct for this package.
Check that the correct key URLs are configured for this repository.Failing package is: Percona-Server-client-56-5.6.43-rel84.3.el7.x86_64GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-Percona

解决：yum update percona-release

然后再执行一遍步骤1

2，安装qpress

yum -y install qpress

3执行以下命令就可以得到数据表了。（backup.xb是我的‘.xb’文件名，/root/data为文件所在路径）

xbstream -x -C /root/data < ~/backup.xb

4.使用 qpress 命令将目标目录下所有以.qp结尾的文件都解压出来

xtrabackup --decompress --target-dir=/root/data

5.备份解压出来之后，需要执行以下命令进行 apply log 操作

xtrabackup --prepare  --target-dir=/root/data

这样就得到原如数据库文件了

其它可以参考以下链接

https://cloud.tencent.com/document/product/236/33363#.E5.90.AF.E5.8A.A8-mysqld-.E8.BF.9B.E7.A8.8B.E5.B9.B6.E7.99.BB.E5.BD.95.E9.AA.8C.E8.AF.81