http://www.networkinghowtos.com/howto/change-the-iptables-log-file/     An important aspect of any firewall are the log files. Iptables on Linux provides logging functionality, however by default, it will get outputted to the /var/log/messages log fi…

log file parallel write概念介绍 log file parallel write 事件是LGWR进程专属的等待事件,发生在LGWR将日志缓冲区(log_buffer)中的重做日志信息写入联机重做日志文件组的成员文件,LGWR在该事件上等待该写入过程的完成.该事件的等待表示重做日志所处的磁盘设备缓慢或存在争用.下面看看官方一些资料是如何解释log file parallel write等待事件的. log file parallel write   Writing redo…

Managing IIS Log File Storage   You can manage the amount of server disk space that Internet Information Services (IIS) log files consume by using compression, remote storage, scripted deletion, and an IIS Log Cleaner Tool. Overview The log files tha…

看代码随手记:log_put.c, __log_write() /* * If we're writing the first block in a log file on a filesystem that * guarantees unwritten blocks are zero-filled, we set the size of the * file in advance. This increases sync performance on some systems, * becau…

年后回来查看mysql运行状况与备份情况,登录mysql从库查看主从同步状态 mysql> show slave status\G; *************************** . row *************************** Slave_IO_State: Master_Host: 101.200.*.* Master_User: backup Master_Port: Connect_Retry: Master_Log_File: master-bin. Rea…

原贴地址:http://www.itpub.net/thread-1777234-1-1.html   谢谢 guoyJoe 老大 这里先引用一下tanel poder大师的图: 什么是log file sync等待事件呢?在一个提交(commit)十分频繁的数据库中,一般会出现log file sync等待事件,当这个等待事件出现在top5中,这个时侯我们需要针对log file sync等待事件进行优化,一定要尽快分析并解决问题,否则当log file sync等待时间从几毫秒直接到20几毫…

数据库主从出错: Slave_IO_Running: No 一方面原因是因为网络通信的问题也有可能是日志读取错误的问题.以下是日志出错问题的解决方案: Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'Could not find first log file name in binary log index file' 解决办法:从机器停止slave mysql> slave…

--========================================= -- Oracle 联机重做日志文件(ONLINE LOG FILE) --========================================= 一.Oracle中的几类日志文件 Redo log files      -->联机重做日志 Archive log files   -->归档日志 Alert log files     -->告警日志 Trace files        …

setup slave from backup i got error Got fatal error 1236 from master when reading data from binary log: 'Could not find first log file name in binary log index file' MASTER MariaDB [(none)]> SHOW BINLOG EVENTS IN 'mysqld-bin.140180' FROM 101070557 LI…

log file sycn是ORACLE里最普遍的等待事件之一,一般log file sycn的等待时间都非常短 1-5ms,不会有什么问题,但是一旦出问题,往往都比较难解决.什么时候会产生log file sync等待?常见有以下几种:1)commit操作2)rollback操作3)DDL操作(DDL操作实施前都会首先进行一次commit)4)DDL操作导致的数据字典修改所产生的commit5)某些能递归修改数据字典的操作:比如查询SEQ的next值,可能会导致修改数据字典.一个典型的情况是,…