mysql temp table performance

Tags: ONS partition status immediate NBU today HTTP translation thisToday, database operations are increasingly becoming a performance bottleneck for the entire application, which is especially noticeable for web applications. It's not just about the performance of the database that DBAs need to worry about, it's something that our programmers need to focus on. When we design the database

optimize the performance of the database system.1 Performance Bottleneck location show commandWe can see the Mysql status and variables through the show command, find the bottleneck of the system:mysql> show status--display status information (extended show state like ' XXX ') mysql> show variables-- Show System varia

Today, database operations are increasingly becoming a performance bottleneck for the entire application, especially for Web applications. As for the performance of the database, this is not just something that DBAs need to worry about, and that's what we programmers need to focus on. When we design the database table structure, we need to pay attention to the

1. Meaning of withThe with as phrase, also known as subquery factoring, allows you to do a lot of things and define an SQL segment, which will be used by the entire SQL statement. Sometimes, it is to make the SQL statement more readable, or it may be in different parts of Union all, as part of the provided data.Especially useful for Union all. Because each part of Union all may be the same, but if each part is executed once, the cost is too high, so you can use the with as phrase, you only need

There is such a requirement: There are multiple tables on the server, and they all have associated key Content-id. The previous practice was to: The front end sends an AJAX request, back-end MySQL according to Content-id, will be a number of tables to do join query, PHP output JSON, and then the front end of the JSON parsing rendering. But some colleagues say this is too much to consume performance, to

This article summarizes and introduces MySQL Performance Optimization in detail. For more information, see the following code: SELECT id, nick_name FROM user, user_group WHERE user_group.group_id = 1 and user_group.user_id = user. id order by user_group.gmt_create desc limit 100,20; Solution 2: SELECT user.id,user.nick_name FROM(SELECT user_idFROM user_groupWHERE user_group.group_id=1ORDER BY gmt_create

characters, because character sets and sorting rules make the characters more complex. (3) Avoid NULL as much as possible) The field must be defined as not null as full as possible. Even if the application does not need to save NULL, many tables contain columns that can be empty. This is only because it is the default option, unless NULL is saved, otherwise, the column is defined as not null. It is difficult for MySQL to optimize queries using empty

This article describes how to use the showprofile command in MySQL to analyze performance. showprofiles is a common command for database performance optimization, for more information, see how to donate the show profile to the MySQL community by Jeremy Cole. This feature is disabled by default, but can be enabled at th

Tags: today enum thread NBU Show course Str LTE roundBest 20 + Experience sharing for MySQL performance optimizationMySQL the best over 20 experience sharing for performance optimization ....... ............... ....................... ........ 1 1. Optimize your query for the query cache ....... ..... ................ ....... ..... ....................... 2 2. EX

Eight methods for optimizing MySQL database performance (2) bitsCN.com Create table customerinfo(CustomerID int not null,Primary key (CustomerID)) TYPE = INNODB;Create table salesinfo(SalesID int not null,CustomerID int not null,Primary key (CustomerID, SalesID ),Foreign key (CustomerID) REFERENCES customerinfo(Custome

Eight methods for optimizing MySQL database performance (2) bitsCN.com Create table customerinfo(CustomerID int not null,Primary key (CustomerID)) TYPE = INNODB;Create table salesinfo(SalesID int not null,CustomerID int not null,Primary key (CustomerID, SalesID ),Foreign key (CustomerID) REFERENCES customerinfo(Custome

variable. So all you need to do is use a variable instead of the MySQL function to turn on the cache.2. EXPLAIN your SELECT queryUse the EXPLAIN keyword to let you know how MySQL handles your SQL statements. This can help you analyze the performance bottlenecks of your query statement or table structure.EXPLAIN's quer

greatly improves the performance. ========================================================== ======================================Differences between InnoDB and MyISAM InnoDB and MyISAM are the two most commonly used table types in MySQL, each with its own advantages and disadvantages, depending on the specific application. The following are the known differe

attention to updating the problem.4 for some simple objects, use value directly as the building. such as IP address, etc.5) Reference by Primary/unique KEY. MySQL can optimize this operation, for example: Java codeSelect City_nameFrom City,statewhere State_id=state.id and state.code= ' CA ' "converted to" select City_name from city where state_id=12 2.1.2 Data typeOne of the most basic optimizations is to make the

Label:20 Experience tuning MySQL performance optimizationPublished: February 15, 2012 published by: OurmysqlSource: Web Base is read: 3,354 kills 0 comments This article will introduce you to 20 MySQL performance optimization experience, these little experiences will help you better use

Tags: value process analysis Eve round note etc engine DeleteToday, database operations are increasingly becoming a performance bottleneck for the entire application, which is especially noticeable for web applications. It's not just about the performance of the database that DBAs need to worry about, it's something that our programmers need to focus on. When we design the database

Label:Reprinted from Coolshell Chenhao great god http://coolshell.cn/articles/1846.html Today, database operations are increasingly becoming a performance bottleneck for the entire application, which is especially noticeable for web applications. It's not just about the performance of the database that DBAs need to worry about, it's something that our programmers need to focus on. When we design the databa

Label:Today, database operations are increasingly becoming a performance bottleneck for the entire application, which is especially noticeable for web applications. It's not just about the performance of the database that DBAs need to worry about, it's something that our programmers need to focus on. When we design the database table structure, we need to pay att

Eight methods to optimize MySQL database performance: bitsCN.com 1. select the most suitable field attributeMySQL can support access to large data volumes, but generally, the smaller the table in the database, the faster the query will be executed on it. Therefore, when creating a table, we can set the field width in t

Today, database operations are increasingly becoming a performance bottleneck for the entire application, which is especially noticeable for web applications. It's not just about the performance of the database that DBAs need to worry about, it's something that our programmers need to focus on. When we design the database table structure, we need to pay attention