PerconaXtrabackup 压缩备份集

压缩备份集

stream模式支持且只支持：tar 和 xbstream 两种格式，后者是xtrabackup提供的专有格式，解包时需要同名的专用命令处理

innobackupex --defaults-file=/data/mysqldata/3306/my.cnf --user=backup --password='backup' --stream=tar /tmp | gzip -> /data/mysqldata/backup/xtra_full.tar.gzinnobackupex: Created backup directory /tmp这段信息表明，流格式标准输出的数据会被临时保存到我们指定的/tmp目录innobackupex: You must use -i (--ignore-zeros) option for extraction of the tar stream.最后这条提示我们，解包时必须使用-i参数[mysql@master backup]$ du -sh *2.8G    2015-07-07_17-11-0314M     xtra_full.tar.gz打包压缩后的差距是很大的

mkdir xbstreaminnobackupex --defaults-file=/data/mysqldata/3306/my.cnf --user=backup --password='backup' --stream=xbstream ./ > /data/mysqldata/backup/xbstream/incremental.xbstream解包[mysql@master backup]$ cd xbstream/[mysql@master xbstream]$ xbstream -x < incremental.xbstream[mysql@master xbstream]$ lsbackup-my.cnf  ibdata1               mysql               sakila  xtrabackup_binlog_info  xtrabackup_infofandb          incremental.xbstream  performance_schema  test    xtrabackup_checkpoints  xtrabackup_logfile

Incremental Streaming Backups using xbstream and tar Incremental streaming backups can be performed with the xbstream streaming option. Currently backups are packed in custom xbstream format. With this feature taking a BASE backup is needed as well.

Taking a base backup:
innobackupex /data/backups

Taking a local backup:
innobackupex –incremental –incremental-lsn=LSN-number –stream=xbstream ./ > incremental.xbstream

Unpacking the backup:
xbstream -x < incremental.xbstream

Taking a local backup and streaming it to the remote server and unpacking it:

innobackupex  --incremental --incremental-lsn=LSN-number --stream=xbstream ./ | /ssh user@hostname " cat - | xbstream -x -C > /backup-dir/"

测试:

[mysql@master xbstream]$ xbstream -x -v < incremental.xbstream[mysql@master xbstream]$ lsbackup-my.cnf  ibdata1               mysql               sakila  xtrabackup_binlog_info  xtrabackup_infofandb          incremental.xbstream  performance_schema  test    xtrabackup_checkpoints  xtrabackup_logfile[mysql@master xbstream]$ more xtrabackup_checkpoints backup_type = full-backupedfrom_lsn = 0to_lsn = 143684677last_lsn = 143684677compact = 0recover_binlog_info = 0

官方文档示例有问题,最后改成这样:

innobackupex --defaults-file=/data/mysqldata/3306/my.cnf --user=backup --password='backup' --incremental --incremental-lsn=143684677 --stream=xbstream ./ | ssh mysql@192.168.255.202 "  xbstream -x -C  /data/mysqldata/backup/"远程端:[mysql@slave backup]$ lsbackup-my.cnf  ibdata1.delta  mysql               sakila  xtrabackup_binlog_info  xtrabackup_infofandb          ibdata1.meta   performance_schema  test    xtrabackup_checkpoints  xtrabackup_logfile

Compact Backups

当备份innodb表时,可以忽略secondary index pages.这回缩小备份集的大小.负面影响是,这回增加prepare用时,因为要重建secondary index
Compact Backups需开启innodb-file-per-table

innobackupex --defaults-file=/data/mysqldata/3306/my.cnf --user=backup --password='backup' --compact /data/mysqldata/backup/

查看xtrabackup_checkpoints可以看到compact = 1

[mysql@master 2016-08-22_22-50-51]$ more xtrabackup_checkpoints backup_type = full-backupedfrom_lsn = 0to_lsn = 143789687last_lsn = 143789687compact = 1recover_binlog_info = 0

Preparing Compact Backups

prepare compact backup需要指定 –reduild-indexes参数

innobackupex --apply-log --rebuild-indexes /data/mysqldata/backup/2016-08-22_22-50-51/ 

Restoring Compact Backups

innobackupex --copy-back /path/to/BACKUP-DIR