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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

ObjectiveRecently help the company to optimize the database, with the previous learning, step-by-step learning knowledge for practice, finally is the speed rub up, a query originally to execute more than 1 minutes now only need 3 seconds.Now the study of what they think and use to summarize, on the one hand to consolidate knowledge, on the other hand to the vast number of students to reference.This set of tutorials is a total of 13 speaking.In this series of tutorials, you will learn1. How to op

0, first to see whether the current open slow query: (1) Quick way to run SQL statements Show VARIABLES like "%slow%" (2) directly to the my.conf to view. Configuration in my.conf (add under [mysqld] below) [Mysqld] Log-slow-queries =/usr/local/mysql/var/slowquery.log long_query_time = 1 #单位是秒 Log-queries-not-using-indexes Use SQL

Tag:handler Execution time file max low memory sql query requestreaderr There are many articles on the web to teach how to configure MySQL server, but considering the different server hardware configuration, the specific application of the difference, those articles can only be used as a preliminary set of reference, we need to configure the optimization according to their own situation, good practice is that the MySQL server stable run for a period of time to run, Optimized based on the stat

Tags: log file safe BSP Bar tar out tools Art file1. What is the use of slow queries? It records all SQL statements that execute more than long_query_time time, helping you to find SQL that executes slowly, so we can optimize these SQL. 2. How do I turn on slow queries? First we check if the MySQL server's slow query status is turned on. Connect to MySQL and then

Reference: 5 kinds of MySQL log analysis tools to compete http://blog.csdn.net/gzh0222/article/details/103844751.mysql-log-filter Tool Script Usage instructions:An analysis tool found on Google code. Two executable scripts for Python and PHP are available. http://code.google.com/p/mysql-log-filter/(need to move ladder climbing wall), 51cto download Link:How to use: (This is the only way to use Python)Python mysql_filter_slow_log.py./mysql1-slow.log--no-duplicates--sort-execution-count--top=10 >>

Label:mysql Slow query log _1--How to turn on slow query logOpen MySQL slow query under WindowsMySQL configuration file in Windows system is generally my.ini find [mysqld] under the AddLog-slow-queries=c:/program Files/mysql/mysql Server 5.1/datafiles/slowquery.loglong_query_time=2Log-

1. The configuration is enabled.Linux:AddLog-slow-queries =/var/lib/mysql/slowquery. log (specify the location where the log file is stored, which can be empty and the system will give a default file host_name-slow.log)Long_query_time = 2 (the time when the record exceeds, the default value is 10 s)Log-queries-not-using-indexes)Log-long-format (if it is set, all queries without indexes will be recorded)Windows:Add the following statement in [mysqld] O

The statements that affect the query speed in mysql are very slow. These slow statements may be written improperly or the Combined Query of multiple tables in big data, therefore, we need to find these statements, analyze the causes, and optimize them.1. Method 1: Enable slow query with commands 1) view the default slow