需求描述:
在mysql中如何刪除binlog,因為隨着數據庫的運行,mysql中產生的binlog會越來越大,有可能把磁盤撐爆了,所以記錄下刪除
binlog的方法.
操作過程:
1.通過系統參數控制保留多久的binlog
在my.cnf中,加入以下的參數,重啟實例
expire_logs_days = 3 #意思是保留3天的binlog;默認值是0,表示不自動刪除.
備注:設置完該參數之后,當重啟實例,或者刷新日志的時候,就會進行檢查,然后刪除3天之前的日志
2.測試在刷新日志的時候,觸發刪除
2.1查看當前系統中的二進制文件
[root@testvm data]# ls -ltr mysql-bin.*
-rw-r----- 1 mysql mysql 177 Jul 25 11:58 mysql-bin.000001
-rw-r----- 1 mysql mysql 201 Jul 25 12:17 mysql-bin.000002
-rw-r----- 1 mysql mysql 201 Jul 25 12:17 mysql-bin.000003
-rw-r----- 1 mysql mysql 201 Jul 25 12:17 mysql-bin.000004
-rw-r----- 1 mysql mysql 201 Jul 25 12:17 mysql-bin.000005
-rw-r----- 1 mysql mysql 154 Jul 25 12:17 mysql-bin.000006
-rw-r----- 1 mysql mysql 114 Jul 25 12:17 mysql-bin.index
2.2修改系統時間為3天之后
[root@testvm data]# date -s "2018-07-28 12:15:00" Sat Jul 28 12:15:00 CST 2018 [root@testvm data]# clock -w
2.3執行flush logs刷新日志
[root@testvm data]# ls -ltr mysql-bin.*
-rw-r----- 1 mysql mysql 201 Jul 25 12:17 mysql-bin.000002 #1這個日志已經被刪除了.
-rw-r----- 1 mysql mysql 201 Jul 25 12:17 mysql-bin.000003
-rw-r----- 1 mysql mysql 201 Jul 25 12:17 mysql-bin.000004
-rw-r----- 1 mysql mysql 201 Jul 25 12:17 mysql-bin.000005
-rw-r----- 1 mysql mysql 201 Jul 28 12:15 mysql-bin.000006
-rw-r----- 1 mysql mysql 154 Jul 28 12:15 mysql-bin.000007
-rw-r----- 1 mysql mysql 114 Jul 28 12:15 mysql-bin.index
2.4查看文件時間,執行flush logs操作
[root@testvm data]# stat mysql-bin.000002 File: `mysql-bin.000002' Size: 201 Blocks: 8 IO Block: 4096 regular file Device: fd00h/64768d Inode: 276736 Links: 1 Access: (0640/-rw-r-----) Uid: ( 502/ mysql) Gid: ( 502/ mysql) Access: 2018-07-28 12:15:31.539000285 +0800 Modify: 2018-07-25 12:17:39.528999883 +0800 Change: 2018-07-25 12:17:39.528999883 +0800 [root@testvm data]# ls -ltr mysql-bin.* -rw-r----- 1 mysql mysql 201 Jul 25 12:17 mysql-bin.000002 -rw-r----- 1 mysql mysql 201 Jul 25 12:17 mysql-bin.000003 -rw-r----- 1 mysql mysql 201 Jul 25 12:17 mysql-bin.000004 -rw-r----- 1 mysql mysql 201 Jul 25 12:17 mysql-bin.000005 -rw-r----- 1 mysql mysql 201 Jul 28 12:15 mysql-bin.000006 -rw-r----- 1 mysql mysql 201 Jul 28 12:17 mysql-bin.000007 -rw-r----- 1 mysql mysql 154 Jul 28 12:17 mysql-bin.000008 #這個生成時間減去標記為黃色的時間必須大於3天,黃色對應的文件才會被刪除. -rw-r----- 1 mysql mysql 133 Jul 28 12:17 mysql-bin.index [root@testvm data]# date Sat Jul 28 12:18:08 CST 2018 [root@testvm data]# ls -ltr mysql-bin.* -rw-r----- 1 mysql mysql 201 Jul 28 12:15 mysql-bin.000006 -rw-r----- 1 mysql mysql 201 Jul 28 12:17 mysql-bin.000007 -rw-r----- 1 mysql mysql 201 Jul 28 12:18 mysql-bin.000008 -rw-r----- 1 mysql mysql 154 Jul 28 12:18 mysql-bin.000009 #18分執行的時候,3天前的17分的文件就都被刪除了. -rw-r----- 1 mysql mysql 76 Jul 28 12:18 mysql-bin.index
備注:經過測試,就是,當刷新日志時(寫滿日志文件或者手動執行flush logs操作),在這個時間3天之前的binlog文件都會被刪除.即執行刷新日志時,減去3天,binlog的時間小於這個的都會被刪除.同時呢,當系統啟動的時候也會執行flush logs操作,也會觸發這個刪除binlog的動作.
3.通過puge binary logs命令來進行刪除
3.1查看當前binlog的信息
mysql> show binary logs; +------------------+-----------+ | Log_name | File_size | +------------------+-----------+ | mysql-bin.000006 | 201 | | mysql-bin.000007 | 201 | | mysql-bin.000008 | 201 | | mysql-bin.000009 | 201 | | mysql-bin.000010 | 201 | | mysql-bin.000011 | 201 | | mysql-bin.000012 | 201 | | mysql-bin.000013 | 201 | | mysql-bin.000014 | 201 | | mysql-bin.000015 | 201 | | mysql-bin.000016 | 201 | | mysql-bin.000017 | 201 | | mysql-bin.000018 | 201 | | mysql-bin.000019 | 201 | | mysql-bin.000020 | 201 | | mysql-bin.000021 | 154 | +------------------+-----------+ 16 rows in set (0.00 sec)
3.2purge刪除binlog
mysql> purge binary logs to 'mysql-bin.000017'; Query OK, 0 rows affected (0.01 sec) mysql> show binary logs; +------------------+-----------+ | Log_name | File_size | +------------------+-----------+ | mysql-bin.000017 | 201 | | mysql-bin.000018 | 201 | | mysql-bin.000019 | 201 | | mysql-bin.000020 | 201 | | mysql-bin.000021 | 154 | +------------------+-----------+ 5 rows in set (0.00 sec)
備注:通過查詢結果可以知道,在17之前的日志都被清除了.不包括17本身.切記!
4.切記不能在操作系統上直接刪除binlog文件,雖然釋放了空間,但是在Index中,還是有記錄.
[root@testvm data]# ls -ltr mysql-bin.* -rw-r----- 1 mysql mysql 201 Jul 28 12:42 mysql-bin.000017 -rw-r----- 1 mysql mysql 201 Jul 28 12:42 mysql-bin.000018 -rw-r----- 1 mysql mysql 201 Jul 28 12:42 mysql-bin.000019 -rw-r----- 1 mysql mysql 201 Jul 28 12:42 mysql-bin.000020 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000021 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000022 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000023 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000024 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000025 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000026 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000027 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000028 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000029 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000030 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000031 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000032 -rw-r----- 1 mysql mysql 154 Jul 28 12:45 mysql-bin.000033 -rw-r----- 1 mysql mysql 323 Jul 28 12:45 mysql-bin.index [root@testvm data]# rm -f mysql-bin.000017 mysql-bin.000018 mysql-bin.000019 mysql-bin.000020 [root@testvm data]# ls -ltr mysql-bin.* -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000021 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000022 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000023 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000024 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000025 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000026 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000027 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000028 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000029 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000030 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000031 -rw-r----- 1 mysql mysql 201 Jul 28 12:45 mysql-bin.000032 -rw-r----- 1 mysql mysql 154 Jul 28 12:45 mysql-bin.000033 -rw-r----- 1 mysql mysql 323 Jul 28 12:45 mysql-bin.index
在mysql中查詢binlog信息
mysql> show binary logs;
+------------------+-----------+
| Log_name | File_size |
+------------------+-----------+
| mysql-bin.000017 | 0 |
| mysql-bin.000018 | 0 |
| mysql-bin.000019 | 0 |
| mysql-bin.000020 | 0 |
| mysql-bin.000021 | 201 |
| mysql-bin.000022 | 201 |
| mysql-bin.000023 | 201 |
| mysql-bin.000024 | 201 |
| mysql-bin.000025 | 201 |
| mysql-bin.000026 | 201 |
| mysql-bin.000027 | 201 |
| mysql-bin.000028 | 201 |
| mysql-bin.000029 | 201 |
| mysql-bin.000030 | 201 |
| mysql-bin.000031 | 201 |
| mysql-bin.000032 | 201 |
| mysql-bin.000033 | 154 |
+------------------+-----------+
17 rows in set (0.00 sec)
備注:還記錄了文件的名字,但是文件的大小是0byte.
查看index中的記錄信息
[root@testvm data]# cat mysql-bin.index ./mysql-bin.000017 ./mysql-bin.000018 ./mysql-bin.000019 ./mysql-bin.000020 ./mysql-bin.000021 ./mysql-bin.000022 ./mysql-bin.000023 ./mysql-bin.000024 ./mysql-bin.000025 ./mysql-bin.000026 ./mysql-bin.000027 ./mysql-bin.000028 ./mysql-bin.000029 ./mysql-bin.000030 ./mysql-bin.000031 ./mysql-bin.000032 ./mysql-bin.000033 [root@testvm data]#
備注:index中還是記錄該信息,認為還是存在的.
重新啟動的時候,會檢查文件是否存在,如果不在會報錯:
mysqld: File './mysql-bin.000017' not found (Errcode: 2 - No such file or directory) 2018-07-28T04:49:02.619409Z 0 [ERROR] Failed to open log (file './mysql-bin.000017', errno 2) 2018-07-28T04:49:02.619416Z 0 [ERROR] Could not open log file mysqld: File './mysql-bin.000018' not found (Errcode: 2 - No such file or directory) 2018-07-28T04:49:02.619426Z 0 [ERROR] Failed to open log (file './mysql-bin.000018', errno 2) 2018-07-28T04:49:02.619428Z 0 [ERROR] Could not open log file mysqld: File './mysql-bin.000019' not found (Errcode: 2 - No such file or directory) 2018-07-28T04:49:02.619436Z 0 [ERROR] Failed to open log (file './mysql-bin.000019', errno 2) 2018-07-28T04:49:02.619438Z 0 [ERROR] Could not open log file mysqld: File './mysql-bin.000020' not found (Errcode: 2 - No such file or directory) 2018-07-28T04:49:02.619445Z 0 [ERROR] Failed to open log (file './mysql-bin.000020', errno 2) 2018-07-28T04:49:02.619447Z 0 [ERROR] Could not open log file
備注:遇到這種問題,直接通過purge binary logs刪除就行了.同時也會更新index文件
切記!!不要從操作系統上直接刪除binlog!!!
文檔創建時間:2018年7月19日16:02:00