mysql myisam

Tags: cannot table operation add PLM begin ext Concurrent rollback row 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 d

table to calculate how many rows Lock Table lock Provides row lock (locking on row level), providing no lock read consistent with Oracle type (non-locking read inSelects), in addition, the row lock of the InnoDB table is not absolute, and if MySQL cannot determine the range 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 "% aaa% "

Tags: SQL hit save buffer pool instance project performance application fitThe MyISAM of MySQL database differs from the InnoDB in the following ways:1. Storage structureEach myisam is stored as three files on disk. The first file name begins with the name of the table, and the extension indicates the file type.The. frm file stores the table definition.The data f

The main difference between the two types is that Innodb supports transaction processing and Foreign keys and row-level locks, but MyISAM does not. Therefore, MyISAM is often considered only suitable for small projects. From the perspective of MySQL users, Innodb and MyISAM both prefer, but from the perspective of my c

In the process of using MySQL, there are some questions about the concepts of MyISAM and InnoDB, and the difference between the two engines has always been a question in my mind. To solve this puzzle, we searched the network and found the following information: MyISAM is the default database engine for MySQL (before

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 transaction proc

Three major MySQL engines: InnoDB, MyISAM, and Memory 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 basic difference is that the MyISAM type does not

In the process of using MySQL, there are some questions about the concepts of MyISAM and InnoDB, and the difference between the two engines has always been a question in my mind. In order to solve this puzzle, search the network, found the following information:MyISAM is the default database engine for MySQL (prior to version 5.5), which was improved by the early

trouble The following are some details and specific implementations of the differences: The fulltext type index is not supported for 1.InnoDB. The number of rows in the table is not saved in 2.InnoDB, that is, when the select count (*) from table is executed, InnoDB scans the entire table to calculate the number of rows, but MyISAM simply reads out the saved rows. Note that when the COUNT (*) statement contains the Where condition, the operations

table is automatically checked when it is turned on, the table is repaired if the table is improperly closed. If you run Myisamchk with the--update-state option, it is labeled as checked. Myisamchk--fast Only check those tables that do not have this flag. Myisamchk--analyze stores statistics for a partial key, as well as for the entire key. Myisampack can pack blobs and varchar columns. MyISAM also supports the following features: True varchar type

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.

A lock is a mechanism by a computer to coordinate multiple processes or threads to concurrently access a certain resource. In databases, in addition to traditional computing resources (such as CPU, ram, and I/O), data is also a resource shared by many users. How to ensure consistency and effectiveness of Concurrent Data Access is a problem that must be solved by all databases. Lock conflicts are also an important factor affecting the concurrent database access performance. From this perspective,

MySQL MyISAM optimization settings, mysqlmyisam I recently used some settings for configuring the mysql server. After testing, I found a good configuration solution. The highlights are at the end. Let's talk about one question:InnoDB and MyISAM in Mysql are the two most comm

Comparison between MySQL storage engine MyISAM and InnoDB This article lists the six common differences between Mysql storage engines MyISAM and InnoDB, which are derived from Mysql manuals and Internet materials. Six major differences between InnoDB and

1. innodb supports transaction processing, not myisam. Myisam is faster and has better performance. 2. select, update, insert, and delete operations: If you execute a large number of SELECT operations, MyISAM is a better choice for InnoDB: for example, 1. transaction processing innodb supports the transaction function, but My