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MYSQL必讀原來自己用的是為了裝的, 所以在設置database usage(如下圖1)的時候依照discuz官方的建議,選的都是Non-Transactional Database Only(只支持MyISAM數據引擎的非事務數據庫),用MyISAM數據庫,還沒涉及到需要InnoDB,因此打算直接不加載INNODB引擎.后來在做WordPress,一開始還不知道原來WordPress用的是InnoDB數據引擎,于是在原來的數據庫里面就建了一個數據庫,一開始也沒發覺問題,安裝,導入sql,都沒問題,當時也沒多想.直到這幾天因為又要裝多一個WordPress,用phpmyadmin訪問數據庫多一點,問題來了.老是一訪問WordPress的數據庫,就彈出錯誤提示“Mysqld-nt.exe應用程序錯誤：“0x005346c4”指令引用的“0x00786000”內存,該內存不能為讀...”,然后就MySQL服務也停了,登陸不了,整個數據庫都訪問不了.

圖1 設置數據庫類型

糾結了挺久,也忘了是看到什么文章觸發了靈感,反正后來才知道原來是數據引擎不同惹的禍.于是就想到重新運行次設置向導,把數據庫類型改成支持InnoDB引擎的.馬上行動,在向導里設置數據庫類型(也就是圖1的database usage)那里,設置成第二項,還在后面的InnoDB Tablespace Settings里把InnoDB數據文件設置放在D:\MySQL InnoDB Datafiles目錄里.但是在最后execute執行的時候,卻老是在Start Service那里出問題,如下圖2.

圖2 Start service出錯

依照網上的某些做法,卸載了MySQL服務,也沒重啟就重新設置,問題如故；把服務卸載了,重啟后再重新設置,則是啟動服務成功,但是在后面的Applying Security Settings的時候有新的問題,如下圖3.圖2那里的錯誤提示則變成“ERROR 2003: Can't connect to MySQL server on 'localhost' (10061)", 說明MySQL還是沒有啟動,或者啟動過,出錯又關了.

順便提一下,在MySQL5里(其他版本的我不知道)每運行一次設置向導,只要按了execute執行,都會在MySQL5的安裝目錄下自動生成一個原來的MySQL的設置文件my.ini的備份bak文件.并且將以修改的時間命名.因此如果設置出了問題,可以從備份文件恢復.

后來還是在錯誤日志里找到思路.錯誤日志就是放在 MySQL5安裝目錄\Data 目錄里的那個以你的計算機名命名的.err文件.

首先我找到以下一段：

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

于是就到“MySQL5安裝目錄\Data?”目錄里把ib_logfile0日志文件刪掉,重啟MySQL服務,還是提示10067錯誤.再去查看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的問題解決了,但是同樣的問題卻出在ib_logfile1上面了.于是依樣畫葫蘆,把ib_logfile1刪了,再重啟MySQL服務,卻發現沒用.難道是還要重啟系統.果真,把前面兩個ib_logfile刪了,重啟系統就搞定了.前面的可能是因為剛開機,所以也行.實際上是需要重啟系統的.這時的日志如下

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,現在只剩下最后一個問題了Default storage engine (InnoDB) is not available.去services.msc里面啟動MySQL服務,還是出錯.但是日志卻是顯示

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

于是去網上搜索了一下,發現提示No valid checkpoint found.的解決辦法：刪除所有現有的ibdataN和ib_logfileN文件后,重啟Mysql.于是照做,果然行了.

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)

奮斗了一天,總算成功地把MySQL從MyISAM轉換成InnoDB引擎了.也學會了讀懂錯誤日志文件err文件了.不過我就在想了,如果從一開始就依照上面的做,不知道會怎么樣呢?

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