======Binary Log二進制日誌======
Binary Log主要是儲存SQL語法的DML和DDL,INSERT INTO,UPDATE,DELETE,REPLACE,CREATE,ALTER和DROP等。
Binary Log 主要應用在
  * Replication-資料庫複寫
  * Data restore資料庫恢復(根據時間點恢復)
======Binlog 啟動======
預設 Mysql服務是每有啟動Binlog，需要到/etc/my.cnf(針對RPM安裝的)<code>#vim /etc/my.cnf</code><code mysql 1>
[mysqld]
~略~
binlog-do-db=dbName #指定哪一個資料庫,此參數可略,預設為全部資料庫
log-bin = /var/lib/mysql/mysql-bin.*  #指定bin-log檔案名稱或是用預設的base_name(此值就是正在運作服務器主機名稱)及路徑
expire-logs-days=5                    #指定bin-log要保留幾天。預設是0,表Binary log不會被移除
max_binlog_size=104857600             #指定單一bin-log檔案大小
[mysqld_safe]
~略~
</code><code>$mysqladmin --defaults-file=/etc/my.cnf -uroot -p reload</code>
======讀取binlog及回覆資料======
<code 1>#mysqlbinlog mysql-binName</code><code>#mysqlbinlog --start-date="YYYY-MM-DD hh:mm:ss" --stop-date="YYYY-MM-DD hh:mm:ss" mysql-binName >mysql-binName.sql</code>
======列出Bin Log======
<code 1>mysql> show binary logs;</code>
或是列出服務器正在讀寫哪一個Binary Log及哪一個byte offset(Position)<code>mysql>show master status;</code><code>+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000012 |      106 |              |                  |
+------------------+----------+--------------+------------------+</code>
另外,利用系統工具**stat**可以看到binary log 文件大小,也就是byte offset(Position)<code>#stat /var/lib/mysql/mysql-bin.000012</code><code>File: ‘/var/lib/mysql/mysql-bin.000012’
  Size: 106       	Blocks: 8          IO Block: 4096   普通檔案
Device: fd00h/64768d	Inode: 158758      Links: 1
Access: (0660/-rw-rw----)  Uid: (  498/   mysql)   Gid: (  498/   mysql)~ 略</code>
======刪除Bin-log======
刪除全部binlog
<code mysql>mysql>RESET MASTER;</code>
指定刪除哪一個binlog之前(不包含自己本身)
<code mysql>mysql> purge binary logs to 'mysql-bin.000003';</code>
以上的手動刪除,是利用MySQL 提供的SQL語法來刪除Binary Log。**若是用system 工具刪除 rm -f /var/lib/mysql/mysql-bin.*是不
建議的做法,因為會引發一些不必要的warning 或是Error 等訊息**

若是用system 工具刪除
例如<code>mysql> show binary logs;</code><code>+------------------+-----------+
| Log_name         | File_size |
+------------------+-----------+
| mysql-bin.000001 |       149 |
| mysql-bin.000002 |       149 |
| mysql-bin.000003 |       149 |
| mysql-bin.000004 |       149 |
| mysql-bin.000005 |       106 |
+------------------+-----------+</code>利用system工具<code>#rm -rf /var/lib/mysql/mysql-bin.000001</code>再用mysql工具觀察<code>mysql>show binary logs;</code><code>------------------+-----------+
| Log_name         | File_size |
+------------------+-----------+
| mysql-bin.000001 |         0 |
| mysql-bin.000002 |       149 |
| mysql-bin.000003 |       149 |
| mysql-bin.000004 |       149 |
| mysql-bin.000005 |       106 |
+------------------+-----------+</code>若再用mysql的**purge**<code>mysql> purge binary logs to 'mysql-bin.000005'; 
Query OK, 0 rows affected, 1 warning (0.03 sec)</code>看warning 訊息<code>mysql> show warnings;</code><code>+---------+------+---------------------------------------------------+
| Level   | Code | Message                                           |
+---------+------+---------------------------------------------------+
| Warning | 1612 | Being purged log ./mysql-bin.000001 was not found |
+---------+------+---------------------------------------------------+</code>
======參考資料======
  - [[http://blog.longwin.com.tw/2009/04/mysql-binlog-recovery-range-by-date-time-2009/|MySQL 使用 binary log 回覆 某段時間區間 的資料]]
  - [[http://www.wretch.cc/blog/siaocheng/1522185|網庫小程]]
  - [[http://blog.csdn.net/eroswang/article/details/1844239|如何管理 MySQL 的 binlog]]
  - [[http://hi.baidu.com/leolance/blog/item/f2e79ec68ec5e8000ff4770a.html|mysql bin-log日誌清理]]