MariaDB 10.1.4 发布，MySQL 衍生版

MariaDB 是一个采用 Aria 存储引擎的 MySQL 分支版本，是由原来 MySQL 的作者 Michael Widenius 创办的公司所开发的免费开源的数据库服务器。

与 MySQL 相比较，MariaDB 更强的地方在于：

• Maria 存储引擎

• PBXT 存储引擎

• XtraDB 存储引擎

• FederatedX 存储引擎

• 更快的复制查询处理

• 线程池

• 更少的警告和bug

• 运行速度更快

• 更多的 Extensions (More index parts, new startup options etc)

• 更好的功能测试

• 数据表消除

• 慢查询日志的扩展统计

• 支持对 Unicode 的排序

这是 MariaDB 10.1 的第二个 Beta 测试版本，也是第 5 个发行版本，该版本值得关注的改进内容包括：

• Encryption: 很多跟表和表空间加密的改变在该版本得以实现，详情请看 updated documentation 和 nice summarization here

• Consistent support for IF EXISTS, IF NOT EXISTS, and OR REPLACE clauses was added to:

• CREATE EVENT and DROP EVENT

• CREATE INDEX and DROP INDEX

• CREATE TRIGGER and DROP TRIGGER

• New server variable: New server variable enforce_storage_engine

• New status variable: New status variables to show the number of grants on different objects (Also see Status Variables Added in MariaDB 10.1)

• New status variable: New status variables to track MASTER_GTID_WAIT time. This feature was contributed by Daniel Black.

• New status variable: New status variable Slave_skipped_errors. This feature was contributed by Daniel Black.

• Performance: xid cache scalability was significantly improved (by using lock-free hash)

• Performance: VIEW definitions are now cached in memory (in the table definition cache)

• Replication: Starting with this release, commits in certain instances in parallel replication complete immediately, avoiding losing throughput when many transactions need conflicting locks. See binlog_commit_wait_count.

完整改进记录：https://mariadb.com/kb/en/mariadb/mariadb-1014-changelog/