MySQL從MyISAM轉換成InnoDB毛病與經常使用處理方法。本站提示廣大學習愛好者：（MySQL從MyISAM轉換成InnoDB毛病與經常使用處理方法）文章只能為提供參考，不一定能成為您想要的結果。以下是MySQL從MyISAM轉換成InnoDB毛病與經常使用處理方法正文
本來本身用的是為了裝的， 所以在設置database usage（以下圖1）的時刻依照discuz官方的建議，選的都是Non-Transactional Database Only（只支撐MyISAM數據引擎的非事務數據庫），用MyISAM數據庫，還沒觸及到須要InnoDB，是以盤算直接不加載INNODB引擎。後來在做WordPress，一開端還不曉得本來WordPress用的是InnoDB數據引擎，因而在本來的數據庫外面就建了一個數據庫,一開端也沒覺察成績，裝置，導入sql，都沒成績，其時也沒多想。直到這幾天由於又要裝多一個WordPress，用phpmyadmin拜訪數據庫多一點，成績來了。總是一拜訪WordPress的數據庫，就彈失足誤提醒“Mysqld-nt.exe運用法式毛病：“0x005346c4”指令援用的“0x00786000”內存，該內存不克不及為讀...”，然後就MySQL辦事也停了，上岸不了，全部數據庫都拜訪不了。
圖1 設置數據庫類型
糾結了挺久，也忘了是看到甚麼文章觸發了靈感，橫豎後來才曉得本來是數據引擎分歧惹的禍。因而就想到從新運轉次設置領導，把數據庫類型改成支撐InnoDB引擎的。立時行為，在領導裡設置數據庫類型（也就是圖1的database usage）那邊，設置成第二項，還在前面的InnoDB Tablespace Settings裡把InnoDB數據文件設置放在D:\MySQL InnoDB Datafiles目次裡。然則在最初execute履行的時刻，卻總是在Start Service那邊出成績，以下圖2。
圖2 Start service失足
想直接到services.msc外面啟動辦事，也不可。毛病提醒內容為：“在 當地盤算機 沒法啟動mysql辦事 毛病1067：過程不測中斷。”
依照網上的某些做法，卸載了MySQL辦事，也沒重啟就從新設置，成績如故；把辦事卸載了，重啟後再從新設置，則是啟動辦事勝利，然則在前面的Applying Security Settings的時刻有新的成績，以下圖3。圖2那邊的毛病提醒則釀成“ERROR 2003: Can't connect to MySQL server on 'localhost' (10061)"， 解釋MySQL照樣沒有啟動，或許啟動過，失足又關了。
趁便提一下，在MySQL5裡（其他版本的我不曉得）每運轉一次設置領導，只需按了execute履行，都邑在MySQL5的裝置目次下主動生成一個本來的MySQL的設置文件my.ini的備份bak文件。而且將以修正的時光定名。是以假如設置出了成績，可以從備份文件恢復。
後來照樣在毛病日記裡找到思緒。毛病日記就是放在 MySQL5裝置目次\Data 目次裡的誰人以你的盤算機名定名的.err文件。
起首我找到以下一段：
InnoDB: Error: log file .\ib_logfile0 is of different size 0 52428800 bytes
InnoDB: than specified in the .cnf file 0 10485760 bytes!
101001 9:47:42 [ERROR] Default storage engine (InnoDB) is not available
101001 9:47:42 [ERROR] Aborting
101001 9:47:42 [Note] D:\MySQL5\bin\mysqld-nt: Shutdown complete
因而就到“MySQL5裝置目次\Data ”目次裡把ib_logfile0日記文件刪失落，重啟MySQL辦事，照樣提醒10067毛病。再去檢查err文件。
101001 18:39:29 InnoDB: Log file .\ib_logfile0 did not exist: new to be created
InnoDB: Setting log file .\ib_logfile0 size to 109 MB
InnoDB: Database physically writes the file full: wait...
InnoDB: Progress in MB: 100
InnoDB: Error: log file .\ib_logfile1 is of different size 0 52428800 bytes
InnoDB: than specified in the .cnf file 0 114294784 bytes!
101001 18:39:30 [ERROR] Default storage engine (InnoDB) is not available
101001 18:39:30 [ERROR] Aborting
101001 18:39:30 [Note] D:\MySQL5\bin\mysqld-nt: Shutdown complete
可以看到，ib_logfile0的成績處理了，然則異樣的成績卻出在ib_logfile1下面了。因而依樣畫葫蘆，把ib_logfile1刪了，再重啟MySQL辦事，卻發明沒用。豈非是還要重啟體系。果真，把後面兩個ib_logfile刪了，重啟體系就弄定了。後面的能夠是由於剛開機，所以也行。現實上是須要重啟體系的。這時候的日記以下
101001 19:19:24 InnoDB: Log file .\ib_logfile0 did not exist: new to be created
InnoDB: Setting log file .\ib_logfile0 size to 109 MB
InnoDB: Database physically writes the file full: wait...
InnoDB: Progress in MB: 100
101001 19:19:26 InnoDB: Log file .\ib_logfile1 did not exist: new to be created
InnoDB: Setting log file .\ib_logfile1 size to 109 MB
InnoDB: Database physically writes the file full: wait...
InnoDB: Progress in MB: 100
InnoDB: Cannot initialize created log files because
InnoDB: data files are corrupt, or new data files were
InnoDB: created when the database was started previous
InnoDB: time but the database was not shut down
InnoDB: normally after that.
101001 19:19:27 [ERROR] Default storage engine (InnoDB) is not available
101001 19:19:27 [ERROR] Aborting
101001 19:19:27 [Note] D:\MySQL5\bin\mysqld-nt: Shutdown complete
好了，如今只剩下最初一個成績了Default storage engine (InnoDB) is not available。去services.msc外面啟動MySQL辦事，照樣失足。然則日記倒是顯示
InnoDB: No valid checkpoint found.
InnoDB: If this error appears when you are creating an InnoDB database,
InnoDB: the problem may be that during an earlier attempt you managed
InnoDB: to create the InnoDB data files, but log file creation failed.
InnoDB: If that is the case, please refer to
InnoDB: http://dev.mysql.com/doc/mysql/en/Error_creating_InnoDB.html
101001 20:45:09 [ERROR] Default storage engine (InnoDB) is not available
101001 20:45:09 [ERROR] Aborting
101001 20:45:09 [Note] D:\MySQL5\bin\mysqld-nt: Shutdown complete
因而去網上搜刮了一下，發明提醒No valid checkpoint found.的處理方法：刪除一切現有的ibdataN和ib_logfileN文件後，重啟Mysql。因而照做，果真行了。
InnoDB: The first specified data file D:\MySQL InnoDB Datafiles\ibdata1 did not exist:
InnoDB: a new database to be created!
101001 21:04:24 InnoDB: Setting file D:\MySQL InnoDB Datafiles\ibdata1 size to 10 MB
InnoDB: Database physically writes the file full: wait...
101001 21:04:25 InnoDB: Log file .\ib_logfile0 did not exist: new to be created
InnoDB: Setting log file .\ib_logfile0 size to 109 MB
InnoDB: Database physically writes the file full: wait...
InnoDB: Progress in MB: 100
101001 21:04:27 InnoDB: Log file .\ib_logfile1 did not exist: new to be created
InnoDB: Setting log file .\ib_logfile1 size to 109 MB
InnoDB: Database physically writes the file full: wait...
InnoDB: Progress in MB: 100
InnoDB: Doublewrite buffer not found: creating new
InnoDB: Doublewrite buffer created
InnoDB: Creating foreign key constraint system tables
InnoDB: Foreign key constraint system tables created
101001 21:04:31 InnoDB: Started; log sequence number 0 0
101001 21:04:32 [Note] D:\MySQL5\bin\mysqld-nt: ready for connections.
Version: '5.0.18-nt' socket: '' port: 3306 MySQL Community Edition (GPL)
斗爭了一天，總算勝利地把MySQL從MyISAM轉換成InnoDB引擎了。也學會了讀懂毛病日記文件err文件了。不外我就在想了，假如從一開端就依照下面的做，不曉得會怎樣樣呢？
