ubuntu server 14.04 LTS mysql error 错误

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今天看了一下 /var/log/mysql/error.log 文件发现这些内容，这些是什么错误？奇怪。。。

150525 18:21:12 [Note] Event Scheduler: Purging the queue. 0 events
150525 18:21:12 InnoDB: Starting shutdown...
150525 18:21:13 InnoDB: Shutdown completed; log sequence number 1595916
150525 18:21:13 [Note] /usr/sbin/mysqld: Shutdown complete

150525 18:21:13 InnoDB: Mutexes and rw_locks use GCC atomic builtins
150525 18:21:13 InnoDB: Compressed tables use zlib 1.2.8
150525 18:21:13 InnoDB: Using Linux native AIO
150525 18:21:14 InnoDB: Initializing buffer pool, size = 512.0M
150525 18:21:14 InnoDB: Completed initialization of buffer pool
150525 18:21:14 InnoDB: highest supported file format is Barracuda.
150525 18:21:14 InnoDB: Waiting for the background threads to start
150525 18:21:15 InnoDB: 5.5.43 started; log sequence number 1595916
150525 18:21:15 [Note] Server hostname (bind-address): '0.0.0.0'; port: 3306
150525 18:21:15 [Note]   - '0.0.0.0' resolves to '0.0.0.0';
150525 18:21:15 [Note] Server socket created on IP: '0.0.0.0'.
150525 18:21:15 [Warning] 'user' entry 'root@ubuntu' ignored in --skip-name-resolve mode.
150525 18:21:15 [Warning] 'proxies_priv' entry '@ root@ubuntu' ignored in --skip-name-resolve mode.
150525 18:21:15 [Note] Event Scheduler: Loaded 0 events
150525 18:21:15 [Note] /usr/sbin/mysqld: ready for connections.
Version: '5.5.43-0ubuntu0.14.04.1'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  (Ubuntu)

这些到底是什么鬼？怎么会记录到 error.log 里边呢？