The EXPLAIN output is the first clue that this query is not properly indexed. Thetype: ALLindicates that the entire table is being scanned to find a single record. In many cases, this will lead to I/O pressure on the system if your dataset exceeds memory. TheUsing filesortindicates that ...
“database is running slower” ticket. While this can be caused by a multitude of factors, it is more often than not caused by a bad or slow MySQL query. While everyone always hopes to recover through some quick config tuning, the real fix is to identify and fix the problem query. ...
To enable the slow query log in MySQL, follow these steps:Log in to your server using SSH. At the command line, type the following command: Copymysql -u root -p Type the MySQL root password. To enable the slow query log, type the following command at the mysql> prompt: CopySET ...
You will connect to MySQL server, view metadata aboutgeneral query logsand view these logs. You will understand the concept of the MySQLbinary logsand where to find them. You will enable and configure aslow query log, simulate some slow query and check this incident in the new log. ...
Which IO operation is causing MySQL to slow down? 2. Which file a process/thread is mostly waiting for? 3. At which execution stage is a query taking time, or how much time will an alter command will take? 4. Which process is consuming most of the memory or how to identify the ...
Using functions in a Where clause or Join clause can also slow down your query. For example, if you filter on an uppercase word, then the value in every row needs to be converted to uppercase to do the conversion: SELECTid,last_name,salaryFROMemployeeWHEREUPPER(first_name)='JOHN'; ...
I made quite a complex View on my MySQL database, and I realized that some queries are slow. My first idea was to add indexes but it's not possible to do on a view so I'm lost on how to improve the performance of my query. ...
Fatal error encountered during command execution while executing Mysql query in C# asp.net Fetch last logon details from Active directory using C#.NET Fetching DistinguishedName from AD using C# Fetching records between two string values using LINQ query Field Initializer in Struct C# FieldInfo.SetVal...
I'm running a query, and struggling to understand why MySQL is runing it so slowly. I've included the actual queries and the EXPLAIN in 3 scenarios below. The first query is very slow to run (23 seconds), but removing just one field (Query 2) from the where clause causes the query...
The first location is in the /etc/my.cnf. You can add some the statements in the MYSQLD section: log_slow_query[=DestDir/LogName.log] long_query_time= 1 that is OK. It doesn't need to change something else. Sorry, you can't reply to this topic. It has been closed....