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在FreeBSD中啟動(dòng)mysql時(shí)報(bào)錯(cuò)，ERROR! The server quit without updating PID file，通常這是可以查看數(shù)據(jù)庫(kù)目錄下的.err日志，里面會(huì)記錄一些具體的錯(cuò)誤信息，對(duì)排錯(cuò)相當(dāng)有用，內(nèi)容如下：

110805 17:30:19 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql5.5/data

110805 17:30:19 InnoDB: The InnoDB memory heap is disabled

110805 17:30:19 InnoDB: Mutexes and rw_locks use GCC atomic builtins

110805 17:30:19 InnoDB: Compressed tables use zlib 1.2.3

110805 17:30:19 InnoDB: Initializing buffer pool, size = 256.0M

110805 17:30:19 InnoDB: Completed initialization of buffer pool

InnoDB: Error: log file /usr/local/mysql5.5/data/ib_logfile0 is of different size 0 5242880 bytes

InnoDB: than specified in the .cnf file 0 67108864 bytes!

110805 17:30:19 [ERROR] Plugin 'InnoDB' init function returned error.

110805 17:30:19 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.

110805 17:30:19 [ERROR] Unknown/unsupported storage engine: InnoDB

110805 17:30:19 [ERROR] Aborting

110805 17:30:19 [Note] /usr/local/mysql5.5/bin/mysqld: Shutdown complete

看到上面紅色字體，顯示錯(cuò)誤是出在日志文件大小上，于是查看mysql的配置文件/etc/my.cnf

# Uncomment the following if you are using InnoDB tables

innodb_data_home_dir = /usr/local/mysql5.5/data

innodb_data_file_path = ibdata1:10M:autoextend

innodb_log_group_home_dir = /usr/local/mysql5.5/data

# You can set .._buffer_pool_size up to 50 - 80 %

# of RAM but beware of setting memory usage too high

innodb_buffer_pool_size = 256M

innodb_additional_mem_pool_size = 20M

# Set .._log_file_size to 25 % of buffer pool size

innodb_log_file_size = 64M

innodb_log_buffer_size = 8M

innodb_flush_log_at_trx_commit = 1

innodb_lock_wait_timeout = 50

配置文件中指定了innodb_log_file_size=64M，在看看我的數(shù)據(jù)庫(kù)目錄下，日志文件大小是不是64M，如下圖，發(fā)現(xiàn)問(wèn)題了，日志文件是5242880是5M

找到問(wèn)題了，解決辦法可以更改配置文件，也可以刪除現(xiàn)在這個(gè)日志，再啟動(dòng)mysql這樣它會(huì)重新生成這兩個(gè)日志文件。

怎么會(huì)出現(xiàn)這個(gè)問(wèn)題呢？

一般來(lái)說(shuō)，是由于，在my.cnf中關(guān)于INNODB的一些配置是被注釋的，在沒(méi)有更改的情況下，系統(tǒng)就使用了默認(rèn)值，這樣，當(dāng)你把關(guān)于innodb的配置選項(xiàng)注釋去掉的時(shí)候，就會(huì)出現(xiàn)這個(gè)報(bào)錯(cuò)！bitsCN.com

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