backup_type = incremental

from_lsn = 31407804447

to_lsn = 31407804447

last_lsn = 31407804447

compact = 0

3.5 增量备份恢复

增量备份的恢复大体为3个步骤

*恢复完全备份

*恢复增量备份到完全备份（开始恢复的增量备份要添加--redo-only参数，到最后一次增量备份去掉--redo-only参数）

*对整体的完全备份进行恢复，回滚那些未提交的数据

恢复完全备份（注意这里一定要加--redo-only参数，该参数的意思是只应用xtrabackup日志中已提交的事务数据，不回滚还未提交的数据）

 innobackupex --defaults-file=/etc/mysql/my.cnf  --apply-log  --redo-only  /home/data/backup/full/2017-03-06_16-44-09/

[notice (again)]

  If you use binary log and don't use any hack of group commit,

  the binary log position seems to be:

xtrabackup: starting shutdown with innodb_fast_shutdown = 1

InnoDB: Starting shutdown...

InnoDB: Shutdown completed; log sequence number 31407802010

170306 17:30:37  innobackupex: completed OK!

将增量备份1应用到完全备份

innobackupex --defaults-file=/etc/mysql/my.cnf  --apply-log --redo-only /home/data/backup/full/2017-03-06_16-44-09/ --incremental-dir=/home/data/backup/incr/2017-03-06_17-04-08/mary_by_event_name.frm'

innobackupex: Copying '/home/data/backup/incr/2017-03-06_17-04-08/performance_schema/events_waits_history.frm' to '/home/data/backup/full/2017-03-06_16-44-09/performance_schema/events_waits_history.frm'

innobackupex: Copying '/home/data/backup/incr/2017-03-06_17-04-08/performance_schema/file_instances.frm' to '/home/data/backup/full/2017-03-06_16-44-09/performance_schema/file_instances.frm'

innobackupex: Copying '/home/data/backup/incr/2017-03-06_17-04-08/performance_schema/mutex_instances.frm' to '/home/data/backup/full/2017-03-06_16-44-09/performance_schema/mutex_instances.frm'

170306 17:33:13  innobackupex: completed OK!

将增量备份2应用到完全备份（注意恢复最后一个增量备份时需要去掉--redo-only参数，回滚xtrabackup日志中那些还未提交的数据）

innobackupex --defaults-file=/etc/mysql/my.cnf  --apply-log  /home/data/backup/full/2017-03-06_16-44-09/ --incremental-dir=/home/data/backup/incr/2017-03-06_17-17-54/

innobackupex: Copying '/home/data/backup/incr/2017-03-06_17-17-54/performance_schema/file_summary_by_event_name.frm' to '/home/data/backup/full/2017-03-06_16-44-

09/performance_schema/file_summary_by_event_name.frm'

innobackupex: Copying '/home/data/backup/incr/2017-03-06_17-17-54/performance_schema/events_waits_history.frm' to '/home/data/backup/full/2017-03-06_16-44-

09/performance_schema/events_waits_history.frm'

innobackupex: Copying '/home/data/backup/incr/2017-03-06_17-17-54/performance_schema/file_instances.frm' to '/home/data/backup/full/2017-03-06_16-44-

09/performance_schema/file_instances.frm'

innobackupex: Copying '/home/data/backup/incr/2017-03-06_17-17-54/performance_schema/mutex_instances.frm' to '/home/data/backup/full/2017-03-06_16-44-

09/performance_schema/mutex_instances.frm'

170306 17:37:42  innobackupex: completed OK!

此时两次增量备份其实都合并到全备上了,恢复是只需要使用全备进行恢复就可以了

模拟数据故障[删除数据库的数据目录，执行如下命令还原]

 innobackupex --defaults-file=/etc/mysql/my.cnf  --copy-back  /home/data/backup/full/2017-03-06_16-44-09/

innobackupex: Starting to copy files in '/home/data/backup/full/2017-03-06_16-44-09'

innobackupex: back to original data directory '/var/lib/mysql'