該篇文章我們介紹由于非法硬件關機，造成了MySQL數據庫的數據表損壞，數據庫不能正常運行的一個實例。下面學步園小編來講解下MySQL數據庫非法關機造成數據表損壞怎么排查?

MySQL數據庫非法關機造成數據表損壞怎么排查

1、訪問網頁，提示錯誤，連接不到數據庫。

2、啟動mysql服務，卸載和關閉rpm安裝的mysql服務(昨天安裝postfix好像yum安裝了mysql)，用netstat-anp|grepmysqld命令查看mysql服務沒有起來，用mysql-uroot-p也連接不到服務器。

3、查看錯誤提示：

11072617:02:23[ERROR]Can'topenthemysql.plugintable.Pleaserunmysql_upgradetocreateit.11072617:02:23[ERROR]/usr/local/mysql/libexec/mysqld:Table'./mysql/host'ismarkedascrashedandlast(automatic)repairfailed11072617:02:23[ERROR]Fatalerror:Can'topenandlockprivilegetables:Table'./mysql/host'ismarkedascrashedandlast(automatic)repairfailed11072617:02:23mysqld_safemysqldfrompidfile/var/lib/mysql/localhost.localdomain.pidended11072617:24:31mysqld_safeStartingmysqlddaemonwithdatabasesfrom/var/lib/mysql11072617:24:31[Warning]'--skip-locking'isdeprecatedandwillberemovedinafuturerelease.Pleaseuse'--skip-external-locking'instead.

發現提示數據庫表損壞。(./mysql/host)

4、修復數據庫表：

cd/var/lib/mysql/mysqlmyisamchk-ofhost.MYI-recovering(withkeycache)MyISAM-table'host.MYI'Datarecords:0表host.MYI修復成功。

5、再次啟動服務，查看服務是否啟動，登錄mysql，還是不行。所以再次查看錯誤日志。

/usr/local/mysql/libexec/mysqld:Table'./mysql/plugin'ismarkedascrashedandlast(automatic)repairfailed/usr/local/mysql/libexec/mysqld:Table'plugin'ismarkedascrashedandlast(automatic)repairfailed11072617:24:31[ERROR]Can'topenthemysql.plugintable.Pleaserunmysql_upgradetocreateit.11072617:24:31[ERROR]/usr/local/mysql/libexec/mysqld:Table'./mysql/user'ismarkedascrashedandlast(automatic)repairfailed11072617:24:31[ERROR]Fatalerror:Can'topenandlockprivilegetables:Table'./mysql/user'ismarkedascrashedandlast(automatic)repairfailed11072617:24:31mysqld_safemysqldfrompidfile/var/lib/mysql/localhost.localdomain.pidended11072617:27:13mysqld_safeStartingmysqlddaemonwithdatabasesfrom/var/lib/mysql11072617:27:13[Warning]'--skip-locking'isdeprecatedandwillberemovedinafuturerelease.Pleaseuse'--skip-external-locking'instead.

6、又發現./mysql/user表損壞。

[chinastor.com-root@localhostmysql]#myisamchk-ofuser.MYI-recovering(withkeycache)MyISAM-table'user.MYI'Datarecords:6

MySQL數據庫非法關機造成數據表損壞怎么排查

7、表修復成功，但是還是啟動不了服務，繼續看錯誤日志。

/usr/local/mysql/libexec/mysqld:Table'./mysql/plugin'ismarkedascrashedandlast(automatic)repairfailed/usr/local/mysql/libexec/mysqld:Table'plugin'ismarkedascrashedandlast(automatic)repairfailed11072617:27:13[ERROR]Can'topenthemysql.plugintable.Pleaserunmysql_upgradetocreateit.11072617:27:13[ERROR]/usr/local/mysql/libexec/mysqld:Table'./mysql/db'ismarkedascrashedandlast(automatic)repairfailed11072617:27:13[ERROR]Fatalerror:Can'topenandlockprivilegetables:Table'./mysql/db'ismarkedascrashedandlast(automatic)repairfailed11072617:27:13mysqld_safemysqldfrompidfile/var/lib/mysql/localhost.localdomain.pidended

8、最后一個錯誤，是./mysql/db表還沒有修復好繼續修復./mysql/db表。

9、執行下面的命令修復./mysql/db表：

[chinastor.com-root@localhostmysql]#myisamchk-ofdb.MYI-recovering(withkeycache)MyISAM-table'db.MYI'Datarecords:0Datarecords:2

10、最后啟動mysql服務。

/usr/local/mysql/bin/mysqld_safe&

11、查看服務是否在運行。

[chinastor.com-root@localhost~]#netstat-anp|grepmysqldtcp000.0.0.0:33060.0.0.0:*LISTEN4360/mysqldunix2[ACC]STREAMLISTENING141724360/mysqld/tmp/mysql.sock

這時發現服務已運行。

12、登錄mysql試試。

[chinastor.com-root@localhost~]#mysql-uroot-p123456WelcometotheMySQLmonitor.Commandsendwith;or\g.YourMySQLconnectionidis35Serverversion:5.1.55-logSourcedistributionCopyright(c)2000,2010,Oracleand/oritsaffiliates.Allrightsreserved.ThissoftwarecomeswithABSOLUTELYNOWARRANTY.Thisisfreesoftware,andyouarewelcometomodifyandredistributeitundertheGPLv2licenseType'help;'or'\h'forhelp.Type'\c'toclearthecurrentinputstatement.mysql>

能登錄。

13、在打開網頁，已經能正常訪問。證明MySQL數據庫的數據表就修復成功了。

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