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As the name suggests, the slow query log records a query with a long execution time. You can set a threshold value and record all SQL statements with a running time exceeding this value to the slow query log file. As the name suggests, the slow query log records a query with a long execution time. You can set a threshold value and record all SQL statements with a

Some developers, especially those who have contact with mysql, may encounter slow mysql queries. Of course, I am referring to a large data volume of millions or tens of millions, not dozens of times, next we will look at the solution to slow query. Some developers, especially those who have contact with mysql, may encounter slow mysql queries. Of course, I am ref

Database optimization tutorial (I) preface definition of slow query, and introduction of database optimization tutorial Preface Recently, I helped the company optimize the database. Based on what I learned, I used the learning knowledge step by step in practice, and finally I got the speed up, it takes only three seconds for a query to be executed for more than one minute. I will summarize what I have learned and what I have used. On the one hand, I

Mysql slow query log analysis tool1. mysql-log-filter tool script usage instructions: an analysis tool found on google code provides two executable scripts: python and php. Http://code.google.com/p/mysql-log-filter/ (need to move the ladder to climb the wall), 51cto download link: http://down.51cto.com/data/2123725use labels: (here only introduces the use of python) python mysql_filter_slow_log.py. /mysql1-slow.log -- no-duplicates -- sort-execution-c

Article 1: how to optimize slow query SQL statements in MySQL56-Introduction to slow logs: in actual log analysis, there are usually a large number of slow logs, at the same time, there will be a large number of records for the same query. here we need to find the most problematic and optimized log in the actual log analysis, generally, the number of

Reference: http://blog.csdn.net/wenqian1991/article/details/17452715The above analysis is based on this picturePull out the math formula. Just contact can't get it right. The following analysis is combined with the above article. Take a closer look,General set fast pointer speed is twice times the slow pointer. And the fast pointer iterates through two pointers at a time, and the slow pointer iterates throu

Automatic slow query and Analysis Based on Python and automatic mail sendingConsists of two program files. The first program implements slow query analysis and file upload. #! /Usr/local/python27/bin/python2.7from fabric. api import * from fabric. context_managers import * from fabric. contrib. console import confirmimport sysimport osimport timeimport datetimesdir = '/alidata/server/mysql/data/'ddir ='/roo

Tags: optimizing index database MySQL Preface Recently 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 se

MySQL Slow queryFirst, check the system all parameter status:Mysql> Show variablesSecond, see the definition of slow query:Mysql> Show variables like '%quer% ';| log_slow_queries | On || Long_query_time | 5.000000 |Mysql> Show variables like ' slow% ';+---------------------+-------------------------------+| variable_name | Value |+---------------------+----------

Label:Found that there is a tool mysqlsla, analysis query log than Mysqldumpslow analysis will be more clear!Install Mysqlsla:Download mysqlsla-2.03.tar.gz[Email protected] export]# TAR-XVF mysqlsla-2.03.tar.gz[email protected] export]# Yum install *dbi*[Email protected] mysqlsla-2.03]# Perl makefile.plCan ' t locate time/hires.pm in @INC (@INC contains:/usr/local/lib64/perl5/usr/local/share/perl5/usr/lib64/perl5/ Vendor_perl/usr/share/perl5/vendor_perl/usr/lib64/perl5/usr/share/perl5.) At/usr/l

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 state of the server. mysql> show Global status;　　The can list the MySQL serve

Label:Found that there is a tool mysqlsla, analysis query log than Mysqldumpslow analysis will be more clear!Install Mysqlsla:Download mysqlsla-2.03.tar.gz[Email protected] export]# TAR-XVF mysqlsla-2.03.tar.gz[email protected] export]# Yum install *dbi*[Email protected] mysqlsla-2.03]# Perl makefile.plCan ' t locate time/hires.pm in @INC (@INC contains:/usr/local/lib64/perl5/usr/local/share/perl5/usr/lib64/perl5/ Vendor_perl/usr/share/perl5/vendor_perl/usr/lib64/perl5/usr/share/perl5.) At/usr/l

First, open the slow query log1. Query slow query time default 10 seconds like "Long_query_time"2. Query slow query log file address like "%slow%"3. If the slow query log is not turned on, configure the item under My.ini [MYSQLD] and restart the MYSQLD service.How MySQL is s

In the front of the blog "when, how to open the MySql log?" ", we learned how to enable the slow query log for MYSQL. Today we look at how to read these slow query logs.Before you trace a slow query log, you must first ensure that you have a slow query at least once. If you are not able to make one yourself:[Email prot

MySQL Slow query1. 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.execute the follow

The method of analyzing the performance of MySQL statement query in addition to using the EXPLAIN output execution plan, you can also let the MySQL record query over a specified time of the statement, we will exceed the specified time of the SQL statement query is called "Slow query."View/Set time definition for "slow query"mysql> Show variables like "long%";+-----------------+----------+| variable_name | V

When the system performance reaches the bottleneck, it is necessary to find out those operations on the performance impact of the system is relatively large, here you can use the database slow query log function to record some more time-consuming data can be manipulated to determine where the need for optimization.Here are some common commands for using slow query logs1. To see if the

The slow query log feature is not turned on by default, and it records a value that executes longer than the parameter Long_query_time (default is 10) and the number of rows accessed exceeds the SQL statement that the parameter min_examined_row_limit is worth.Mysql> Show variables like ' Long_query_time ' \g*************************** 1. Row ***************************variable_name:long_query_time value:10.0000001 row in Set (0.00 sec) mysql>Th

Tags: blog http recommended suspended animation Gravity statement root list slowLet's take a look at how to read these slow query logs.Before you trace a slow query log, you must first ensure that you have a slow query at least once. If you are not able to make one yourself:[Email protected]# mysql-e ' SELECT SLEEP (8);There's only one thing you can do with this

Tags: mongodb db.setprofilinglevelslow query log in MongoDB1. turn on the query log .(1) Dynamic Open , can be selective to the specified DB turn on slow query log , However, the slow query log is manually opened after the server restarts. Db.setprofilinglevel (1,300)The Setprofilinglevel has two parameters , the first parameter represents the slow query log swit