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Mysql> explain extended select count (*) from xuehao;+ ---- + ------------- + ------- + ------ + --------------- + ------ + --------- + ------ + ---------- + -------------------------------- +| ID | select_type | table | type | possible_keys | key |

Ⅰ, functional analysis 1.1 multi-Threading Introduction +-----------+ | mysqlpump | +-----+-----+ | +-----------------------------------+ | | | +---v---+ +---v---+ +--

The following articles mainly describe the practical application and specific operation steps of the extended option in the MySQL EXPLAIN statement. We all know that there is an explain command in the MySQL database, its main function is to analyze

How to Learn the extended option of MySQL explain statement MySQL has an explain command that can be used to analyze the running effect of the SELECT statement. For example, explain can obtain the SELECT statement.Indexes used, sorting, and

When a mysql-related fault occurs in the development or test environment, most of my friends may post on the Forum and discuss the problem with the QQ group. This method is one of the effective ways to get help. However, in a production environment

When a mysql-related fault occurs in the development or test environment, most of my friends may post on the forum and discuss the problem with the QQ group. This method is one of the effective ways to get help. However, in a production environment

How to obtain mysql help information and mysql help information When a mysql-related fault occurs in the development or test environment, most of my friends may post on the Forum and discuss the problem with the QQ group. This method is one of the

In the development or testing environment when encountering MySQL-related failures, most friends may be posted through the Forum, QQ group discussion method to get help. This approach is one of the effective ways to get help. However, in the

How to obtain MySQL help information When a MySQL-related fault occurs in the development or test environment, most of my friends may post on the Forum and discuss the problem with the QQ group. This method is one of the effective ways to get help.

MySQLSQL profiling (SQLprofile) Analyzing SQL Execution overhead is an important means to optimize SQL. In MySQL databases, you can configure the profiling parameter to enable SQL profiling. This parameter can be set at the global and session level.

The author is so careful. I will share my notes with my blog followers. for ease of understanding, the injection examples of implicit conversions can be analyzed directly. CREATE a TABLE and add two users to create table 'users' ('userid' int (11)

The results of the test performed by mysql-test-run.pl are as follows:CURRENT_TEST:rpl.rpl_ssl= = = SHOW MASTER STATUS = = =----1. ----File slave-bin.000001Position 357binlog_do_dbbinlog_ignore_db=========================== = = SHOW SLAVE STATUS = =

Summary of implicit conversions of MySQL and summary of mysql Preface I saw an article a few days ago: the implicit conversions of MySQL with millions of values are quite good, and I am not very clear about the implicit conversions of MySQL, so I

Analyzing SQL execution overhead is an important means to optimize SQL. In MySQL databases, you can configure the profiling parameter to enable SQL profiling. This parameter can be set at the global and session level. The global level applies to the

In the development or test environment in the face of MySQL-related failures, most friends may be through the forum post, QQ group discussion way to get help. This approach is one of the effective ways to get help. However, in the production

Usage of mysqlloaddatainfile (importing 40 W data to mysql in 3-5 seconds) bitsCN.com If you want to import Chinese data, the utf8 character set in mysql will save the UTF-8 character set for the xxx.txt file you want to import. the command load

Explain analyzes SQL efficiency and explain SQL Efficiency The Explain command is the first recommended command for solving database performance. Most performance problems can be solved simply by using this command. The Explain command can be used

Text and varchar character indexes are invalid when innodb in mysql is a uft8 character set. The index length of a single field is limited to 767 bytes due to the index length limit in the innodb utf8 character set. The maximum index length is: The

If you want to import Chinese data, the utf8 Character Set set in mysql will save the UTF-8 character set for the xxx.txt file you want to import. The command load data infile "d: /Websites/Sxxxx/test1.txt "ignore into table 'names' fields

This article mainly introduces the MySQL performance analysis tool profile tutorial, this article describes how to use MySQLprofile, does not involve specific sample analysis, if you need it, you can refer to the analysis of SQL execution overhead,