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When the -- log-slow-queries [= file_name] option is enabled, mysqld writes a log file containing all SQL statements whose execution time exceeds long_query_time seconds. Obtaining the initial lock time is not counted as the execution time. If the file_name value is not given, no host name is provided by default, and the suffix is-slow. log. If the file name is provided but not the absolute path name, the f

Enable slow Log There are two ways to enable: 1, in MY.CNF through Log-slow-queries[=file_name] 2, when the mysqld process is started, specify the--log-slow-queries[=file_name] option Five common tools for comparisonMysqldumpslow, Mysqlsla, Myprofi, Mysql-explain-slow-log, Mysqllogfilter

, the InnoDB log buffer (memory) is written to the log (called by the system to call write), simply to transfer the data to the operating system cache, the operating system cache also refers to memory. There is no persisted data.So at 0 and 2, the last second is lost when a crash or power outage occurs because the data is only present in the operating system cache. It is generally possible to lose more than one second of data, such as blocking when performing a flush operation.Summarize:Set to 1

The MySQL slow query log is a log record provided by MySQL, which is used to record SQL statements that execute more than long_query_time seconds. The minimum and default values for Long_query_time are 0 and 10, respectively. It means SQL statements that run more than 10 seconds. The value can be specified as microseconds. For logging to a file, the write time includes the microsecond portion. To log to a table, write only the whole number of times. T

Tags: des style http io ar color OS using SPTransfer from http://www.searchdatabase.com.cn/showcontent_86230.htmWith its excellent performance, low cost and rich resources, MySQL has become the preferred relational database for most Internet companies. Although performance is good, but the so-called "good Horse with good saddle", how to better use it, has become a required course for development engineers, we often see from the job description such as "Proficient MySQL", "SQL statement optimizat

Tags: MySQL sql slow log optimizerPrevious article: MySQL5.6 How to optimize SQL statements for slow queries--Slow log introductionIn the actual log analysis, usually slow log number of logs, while the same query is logged a lot of bars, here you need to find the most problematic from the

[MySQLSlowlog] correctly and securely clear the online slow query log slowlog process [MySQLSlowlog] correct and secure clearing of the online slow query log slowlog process _ MySQL 1. see the slow log status; mysql> show variables like '%slow%';+---------------------+------------------------------------------+| Vari

Slow computer speed Reasons for slow computer speed and Solutions Slow computer speed Slow shutdown: 1. Start msconfig and press enter to start. Check anti-virus software, firewall, and ctfmon to remove the other three hooks. OK. Close the check box and restart the computer. 2. Download the shutdown acceleration patch

PHP, behind MySQL, when the user is more than 20 people, there will be access to the phenomenon of slow, who can know why? Available for a fee I did a such an application, now can not solve, distress n days, if there are experts to pay to help solve. The specific can be contacted with QQ 24508609. Non-master, do not delay everyone time. Web server, network speed of about 1M, is it related to network speed? Master can help me analyze, or directly co

But how can we find out which SQL statement has been executed for a long time? You can refer to the MySQL Slow Log for details.First, find the MySQL configuration file my. cnf. The configuration for enabling slow queries varies with mysql versions.For mysql 5.0[Mysqld]Long_query_time = 1Log-slow-queries =/var/log/mysql/slow