Percona XtraBackup 1.9.1 发布了，XtraBackup 是一个用来备份 MySQL 的 InnoDB 数据库的开源工具，支持增量备份。

Percona 目前已经在开始 Percona XtraBackup 2.0 的开发，而 1.9.1 版本其实相当于 2.0 的第二个 Beta 版。

该版本增加一些令人兴奋的新特性和 bug 修复：

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.

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