mysql主從同步拋出異常：
Last_Error: Error 'File './law/sales.MYD' not found (Errcode: 24)' on query. Default database: 'law'. Query: 'UPDATE law.sales SET usertyp='6', qqnu='', mobil='', phon='', areacod=',150000,150100,150101,150102,150103,150104,150105,150106,150107,150108,150109,150110,150112,150113,150114,150115,150116,150117,150118,150200,150201,150202,150203,150204,150205,150206,150207,150208,150209,150210,150211,150212,150213,150214,150215,150300,150301,150302,150303,150304,150305,150306,150307,150308,150309,150310,150311,150312,150313,150314,150315,150316,150317,150700,150701,150702,150703,150704,150705,150706,150707,150708,150709,150800,150801,150802,150803,150804,150900,150901,150902,150903,150904,150905,150906,150907,150908,150909,150910,150911,150912,150913,150914,151100,151101,151102,151103,151104,151105,151106,151107,151108,151109,151110,210000,210500,210501,210502,210503,210504,210505,210506,210507,210508,210600,210601,210602,210603,210604,210800,210801,210802,210803,210804,210805,210806,
Skip_Counter: 0
直接的處理方法：
重啓從數據庫，這樣就可以執行過去。因爲剛啓動的時候是不會超過文件限制的。
系列分析命令：
用perror工具查看具體錯誤:
[root@workserv bin]# pwd
/usr/local/mysql/bin
[root@workserv bin]# ./perror 24
OS error code 24: Too many open files
錯誤爲超出最大打開文件數限制。
查看系統的最大打開文件數： 65535不存在超出的可能。
[root@workserv1 bin]# ulimit -n
65535
查看數據庫的最大打開文件數的限制：
mysql> show variables like 'open_files_limit';
+------------------+-------+
| Variable_name | Value |
+------------------+-------+
| open_files_limit | 4156 |
+------------------+-------+
如果這個值太小不夠用，可以設置足夠大 ， 修改 my.cnf
open_files_limit = 8000
另外可以查看當前打開的文件數：
mysql> show status like '%Open_files%';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| Open_files | 473 |
+---------------+-------+
1 row in set (0.00 sec)
mysql 引擎： myisam根據架構，每查詢一個表需要打開兩個文件及使用兩個文件句柄，類推查詢使用到多少個表就要使用2倍於多少個文件句柄。
*.frm *.MYD *.MYI
系統的修正限制打開文件數方法：使用 sysctl
[root@xxx]# sysctl -w fs.file-max=43621
[root@xxx]# sysctl -a | grep fs.file-max
fs.file-max = 43621