mysql myisam

MySQL engine introduction ISAM, MyISAM, HEAP, InnoDB The MySQL Database Engine depends on how MySQL is compiled during installation. To add a new engine, you must recompile MySQL. By default, MySQL supports three engines: ISAM,

increase the deployment and performance of multiple users. There is no need to expand locking in InnoDB, because row-level locking in InnoDB is suitable for very small space. InnoDB also supports foreign key forcing. In SQL queries, You can freely mix InnoDB tables with other MySQL tables, or even in the same query.InnoDB is designed for maximum performance when processing massive data volumes. Its CPU efficiency may be unmatched by any other disk-ba

row lock of the InnoDB table is not absolute, and if MySQL cannot determine the scope to scan when executing an SQL statement, the InnoDB table also locks the full table, such as the Update table set num=1 where name like "2%" 6.InnoDB Support Things Select the storage engine to select according to the actual situation. In general, if the query is more recommended to use

Description of MyISAM and InnoDB: InnoDB and MyISAM are the two most common table types used by many people when using MySQL. The two table types have their own advantages and disadvantages, depending on the specific application. The basic difference is that the MyISAM type does not support advanced processing such as

The differences between MySQL database InnoDB and MyISAM data engines: InnoDB and MyISAM are the two most commonly used table types in MySQL. their respective advantages and disadvantages depend on the specific application. The basic difference is that the MyISAM type does n

The following articles mainly describe the MySQL table types, that is, detailed parsing of MyISAM and innodb. If you are interested in the MySQL table types, that is, the actual operations related to detailed parsing of MyISAM and innodb, you can click to view the following articles.

Summary of MySQL Myisam and Innodb comparison bitsCN.com Summary of MySQL Myisam and Innodb Summarize the differences between MySQL Myisam and Innodb engines. First, the two are in the file structure:

alternative to the InnoDB transaction engine that supports COMMIT,ROLLBACK , and other transactional features.Memory: Keep all your data in RAM and provide extremely fast access in environments where you need to quickly find references and other similar data.Merge: Allows a MySQL DBA or developer to logically group together a series of equivalent MyISAM tables and reference them as 1 objects. Ideal for VLD

from User; Select XXX.Two. Myisampack (MyISAM table compression tool)Myisampack is a table compression tool. Before compressing, you need to confirm that the mysqld is closed or that the table you want to compress does not have additional SQL operations, and that the compression process consumes CPU resources, which is recommended in the idle state of the server. You can compress the data file to 40%-70%, and when you use the table later, the informa

Welcome to the Linux community forum and interact with 2 million technical staff. InnoDB and MyISAM are two of the most common table types used by many people when using MySQL. Each of these two table types has its own advantages and disadvantages, depends on the specific application. The basic difference is that the MyISAM type does not support advanced processi

The MySQL database MyISAM storage engine is converted to Innodb. when the mysql database storage engine is MyISAM, data tables may be locked in the case of high traffic volumes, this will cause users to return 502 when they connect to the website. in this case, the MySQL dat

The count query efficiency of mysql from innodb to MyIsam greatly improves bitsCN. the count query efficiency of commysql from innodb to MyIsam has been greatly improved recently, after the company has a business log table that exceeds 5 million, count (*) needs to be 4 minutes 55 seconds, after the storage engine of the table is converted from innodb to

Difference between engineinnodb and enginemyisam in mysql bitsCN.com What is the difference between engine = innodb and engine = myisam in mysql? When I first used MySQL Administrator to create a database, the table is of the InnoDB type by default, so I did not care about it. Later, when using Access2MySQL to export

, you should use the InnoDB table. For INNODB types that support things, the main reason for the speed is that the AUTOCOMMIT default setting is open, and the program does not explicitly call begin to start a transaction, resulting in an automatic commit for each insert, which seriously affects the speed. You can call begin before you execute SQL, and multiple SQL forms a thing (even if the autocommit is open), which will greatly improve performance. ===========================================

with the write foreign key to delete the foreign keyAlter TableLocstockDrop Foreign KeyLOCSTOCK_IBFK2 See what foreign keys are in the table showCreate TableLocstock[CONSTRAINT Symbol] FOREIGN KEY [ID](Index_col_name, ...) REFERENCEStbl_name (index_col_name, ...) [On DELETE {RESTRICT | CASCADE | SET NULL | NO ACTION}] [On UPDATE {RESTRICT | CASCADE | SET NULL | NO ACTION}]All tables must be of type InnoDB, they cannot be temporary tables. In the reference table, there must be an index in

-locking read inSelects), in addition, the row lock of the InnoDB table is not absolute, if MySQL cannot determine the scope to scan when executing an SQL statement, the InnoDB table also locks the full table, such as the Update table set num=1 where name like ldquo;%aaa%rdquo; MySQL storage engine MyISAM and InnoDB how to choose

Converting MySQL from MyISAM to InnoDB errors and solutions bitsCN.com was later working on WordPress. at the beginning, I still did not know that WordPress was using the InnoDB data engine, so I built a database in the original database, and I didn't find any problems at the beginning. it was okay to install and import SQL statements. I didn't think much at the time. The problem is that one more WordPress

Transfer from http://yuwensan126.iteye.com/blog/1138022The two most commonly used engines in the Mysql database are Innordb and MyISAM. The function of INNORDB is much stronger than myiasm, but Innordb performance is much worse than MyISAM, if your website just do simple query, update, delete, then use Myiasm is the best choice.All performance tests are tested on

What is the difference between mysql MyISAM and InnoDB? How to optimize the MYSQL database ?, Myisaminnodb. What is the difference between mysql MyISAM and InnoDB? How to optimize the MYSQL database ?, Basic differences between my

MySQL has two storage engines:InnoDB and MyISAM, and the following table is a simple comparison of the two engines MyISAM InnoDB The difference in composition: Each myisam is stored as three files on disk. The first file name begins with the name of the table, and the extensi