MySQL備份工具 Percona XtraBackup 1.9.1 發布

該版本增加一些令人興奮的新特性和 bug 修復：

新特性包括：

• Backup and restore of LRU dump.
  For servers that support  dump and restore of the XtraDB buffer pool (LRU), namely Percona Server, this will enable a server restored from backup to give excellent performance without a lengthy “warm up” time. If provisioning a slave, this means your new slave will end up with a warmed up buffer pool to mimic that of the master.
• Streaming incremental backups.
  It is now possible to stream incremental backups, lifting a limitation from previous versions where it was only possible to stream full backups.
• Parallel compression
  Percona XtraBackup can now use multiple CPUs to perform a compressed backup, significantly reducing the amount of time needed.
• Parallel compression (‘--compress-threads‘) can be used together with parallel file copying (‘--parallel‘). For example, ‘--parallel=4 --compress --compress-threads=2‘ will create 4 IO threads that will read the data and pipe it to 2 compression threads.
• New streaming format to work with parallel compression.
  The xbstream format is now supported along with the tar format. The new xbstream format works with parallel compression to (without caching) stream several compressed files at once.
• tar4ibd functionality is replaced by functionality in the xtrabackup binary itself.
• The xbstream utility is added
  This utility has a tar like interface to the xbstream format.