Tags: SQL statement ASE log HTTP Query general table variables SSL Opening the general log will log all SQL statements that arrive at MySQL server. Generally does not open the function, because the amount of log can be very large. However, in some cases, the general
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 microseco
This article describes how to enable slow log query in MYSQL5.7.9. For more information, see MYSQL 5.7.9 as the monitoring database of ZABBIX 2.4.7. some time ago, the slow query log was enabled, and later it was found that the
A basic tutorial on MySQL slow query log analysis,
0. First, check whether slow query is Enabled:
(1) quick way to run SQL statements
show VARIABLES like "%slow%"
(2) go to my. conf to view the information.
Configuration in my. c
1.1 IntroductionTurn on the slow query log, you can let the MySQL record query over a specified time of the statement, through the location analysis of performance bottlenecks, to better optimize the performance of the database system.1.2 Login Database View[Email protected] lib]# Mysql–urootBecause there is no setting
Tags: Japanese view status open run MySQL test globTo view the configuration: View slow query time
show variables like "Long_query_time"; Default 10s View slow query configuration
show status like "%slow_queries%"; View slow query
' or nid in (11,22,33); REF Find one or more values based on an index SELECT * from tb1 WHERE name = ' seven '; Eq_ref Use primary key or unique type when connecting Select Tb2.nid,tb1.name from TB2 left join tb1 on tb2.nid = Tb1.nid; CONST Constant The table has a maximum of one matching row, because only one row, the column values in this row can be considered constants by the remainder of the optimizer, and the const table is fast because they are read only once. Select Nid from tb1 where
Tags: read slow log Mon-binary third-party Linux div full SQL databaseThe slow query log of the MySQL database is an important tuning auxiliary log, but the log format of the MySQL defa
In 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 tracing the slow
MySQL Slow query:Slow query-related variablesSlow_query_log: This parameter controls the state of the slow query, 1 indicates the on state, and 0 indicates the off stateSlow_query_log_file: Slow Query
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
Mysql slow query logs are very useful for queries with tracing problems. You can analyze the resource-consuming SQL statements in the current program. How can I open mysql slow query log records, next, we will introduce you in detail
Mysql
meaning of top n, that is, the number of data records in the previous row-g, followed by a RegEx matching pattern, case insensitiveMysqldumpslow-s c-t 20 host-slow.logMysqldumpslow-s r-t 20 host-slow.logThe preceding command shows the 20 most frequently accessed SQL statements and the 20 most returned SQL statements in the record set.Mysqldumpslow-t 10-s t-g "left join" host-slow.log returns the first 10 SQL statements containing the left join according to time.Mysql
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-
MySQL Slow log is often the problem of locating SQL performance. Index usage can be adjusted by slow log analysis. This is one of the most used features.
At present, MySQL also supports the slow logging below the millisecond level, this feature has a lot of useful, here is
1. mysql-log-filter tool script usage instructions: an analysis tool found on googlecode provides two executable scripts: python and php. Code. google. compmysql-log-filter (requires a ladder to climb the wall), bitsCN Download link: 1. mysql-log-filter tool script instructions:
An analysis tool found on google code provides two executable scripts: python and php
OPS needs to record the "slow action" commands in the master Redis and then find the relevant business party, otherwise, blockIt's not funny anymore. The relevant commands are then found directly in the Redis Handbook.SLOWLOG subcommand [argument] What is Slowlogslow log is the journaling system used by Redis to record query execution times.
[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
1 Slow query definitionmeans that MySQL logs all SQL statements that execute a time threshold that exceeds the Long_query_time parameter setting. The slow query log is the log that logs these SQL.2 Turn on
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
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