Decompress and prepare a backup

Before you can prepare the backup you need to decompress all the files.

Decompress a backup

• To decompress backups made using LZ4 or ZSTD compression algorithm, install the corresponding package for your package management system.

  Install on APT systems

  Install the lz4 packageInstall the zstd package

  $ sudo apt install lz4
  

  $ sudo apt install zstd
  

  Install on YUM systems

  Install the lz4 packageInstall the zstd package

  $ sudo yum install lz4
  

  $ sudo yum install zstd
  

• Use the --decompress option to decompress the backup.

  $ xtrabackup --decompress --target-dir=/data/compressed/
  

  Note

  --parallel can be used with --decompress option to decompress multiple files simultaneously.

  Percona XtraBackup does not automatically delete compressed files. To clean up the backup directory, use the --remove-original option. If you do not remove the compressed files, these files will not be copied or moved to the datadir when using the --copy-back or --move-back options.

Prepare the backup

When the files are decompressed you can prepare the backup with the --prepare option.

$ xtrabackup --prepare --target-dir=/data/compressed/

Confirmation message

InnoDB: Starting shutdown...
InnoDB: Shutdown completed; log sequence number 9293846
170223 13:39:31 completed OK!

Now the files in /data/compressed/ are ready to be used by the server.

The next step is to Restore a backup.