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MyISAM is the default database engine for MySQL (prior to version 5.5), which was improved by the early ISAM (Indexed sequential access method: Indexed sequential access methods). Although performance is excellent, there is one drawback: Transaction processing (transaction) is not supported. However, over the years, MySQL has also introduced InnoDB (another database engine) to enhance referential integrity and concurrency violation handling mechanisms
Label:1, transaction processingInnoDB supports transactional features, MyISAM not supported. Myisam executes faster and performs better. 2,select, UPDATE, INSERT, delete operationMyISAM: If performing a large number of select,myisam is a better choice InnoDB: If your data performs a large number of inserts or update, for performance reasons, you should use the InnoDB table 3, locking mechanism is different
MyISAM is the default database engine for MySQL (prior to version 5.5), which was improved by the early ISAM (Indexed sequential access method: Indexed sequential access methods). Although performance is excellent, there is one drawback: Transaction processing (transaction) is not supported. However, over the years, MySQL has also introduced InnoDB (another database engine) to enhance referential integrity and concurrency violation handling mechanisms
last deadlock record in the MySQL client through the show InnoDB STATUS \g statement. Since the printed statement will be messy, it is better to use the pager less command to view the results through the file content browsing method. (ends with Nopager)The resulting deadlock record is as follows: Depending on the result of the deadlock record, it is clear that the two statements have been deadlocked and that the lock violation occurred on the primar
In MySQL, the index is the concept of storage engine level, different storage engine implementation of the index is different, this article mainly discusses the MyISAM and InnoDB two storage engine index implementation way.MyISAM Index ImplementationThe MyISAM engine uses B+tree as the index structure, and the data domain of the leaf node holds the address of the record. is a schematic diagram of the MyISAM index:There are three columns in the table,
you need to run the Optimize Table command frequently to restore space wasted by the updated mechanism (you should know that the data structure should be known, the ISAM file format is defective). MyISAM also has some useful extensions, such as the Myisamchk tool for repairing database files and the Myisampack tool for recovering wasted space.MyISAM emphasizes fast read operations, which may be the main reason why MySQL is so popular with Web development: in Web development, the bulk of your da
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: MyISAM typeTransactions are not supported.Processing and other advanced processing, while InnoDB type support. MyISAM tablesPerformanceThe execution speed is faster than that of
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 processing, while the InnoDB type does. MyISAM tables emphasize performance, and the execution speed is faster t
Tags: row lock statement Storage angle type Simple union backupMyISAM and InnoDB explanation InnoDB and MyISAM are the two most common table types used by many people when using MySQL, both of which have pros and cons, depending on the application. The basic difference is that the MyISAM type does not support advanced processing such as transaction processing, and InnoD
Tags: feature details Humanities class Delete arc requirements pros and cons MasterMyISAM and InnoDB explanation InnoDB and MyISAM are the two most common table types used by many people when using MySQL, both of which have pros and cons, depending on the application. The basic difference is that the MyISAM type does not support advanced processing such as transaction processing, and
Tags: Resolving bin statements yourself part of an Instance development developer table operationsMyISAM and InnoDB explanation InnoDB and MyISAM are the two most common table types used by many people when using MySQL, both of which have pros and cons, depending on the application. The basic difference is that the MyISAM type does not support advanced processing such as transaction processing, and
MyISAM and InnoDB explanationInnoDB and MyISAM are the two most common table types used by many people when using MySQL, both of which have pros and cons, depending on the application. The basic difference is that the MyISAM type does not support advanced processing such as transaction processing, and InnoDB type support. The MyISAM type of table emphasizes performance, which is performed more quickly than
Label:MyISAM and InnoDB explanation InnoDB and MyISAM are the two most common table types used by many people when using MySQL, both of which have pros and cons, depending on the application. The basic difference is that the MyISAM type does not support advanced processing such as transaction processing, and InnoDB type support. The MyISAM type of table emphasize
Tags: log file col BSP ble cannot span speed wait empty1. Innodb_lock_wait_timeout MySQL can automatically monitor the deadlock caused by the row lock and handle the corresponding, but the deadlock caused by the table lock cannot be automatically monitored, so this parameter is mainly used to wait for a specified time to roll back after a similar situation occurs. The system default value is 50 seconds. Users can set their own according to the busines
# The risk of dirty page brush disk Two-time principle mechanism of writing 1, solve the problem 2. Usage Scenarios 3, Doublewrite's work flow 4. Crash recovery # Side Effects of Doublewrite 1. Monitor Doublewrite Load 2. Close the doublewrite scene One, dirty page brush disk riskMinimum unit for IO:1, the minimum unit of database IO is 16K (mysql default, Oracle is 8K)2, the minimum unit of file system IO is 4K (also 1 k)3, the minim
Differences between MyISAM and InnoDB and enterprise selection engine requirements, myisaminnodb Differences between MyISAM and InnoDB and enterprise selection Engine Requirements I. Differences between MyISAM and InnoDB 1. MySQL uses MyISAM by default. 2. MyISAM does not support transactions, but InnoDB does. The AUT
Innodb is a multi-thread concurrent storage engine. Internal read/write operations are implemented using multiple threads. Therefore, innodb implements a highly efficient concurrency synchronization mechanism. Innodb does not directly use the latch synchronization structure provided by the system, but encapsulates and optimizes it, but is also compatible with the
Label: MySQL is MyISAM by default. MyISAM does not support transactions, while InnoDB supports. InnoDB autocommit By default is open, that is, each SQL statement will be encapsulated into a transaction by default, automatically commit, which will affect the speed, so it is best to put a number of SQL statements between Begin and commit, compose a transaction to commit.
MyISAM and InnoDB explanationInnoDB and MyISAM are the two most common table types used by many people when using MySQL, both of which have pros and cons, depending on the application. The basic difference is that the MyISAM type does not support advanced processing such as transaction processing, and InnoDB type support. The MyISAM type of table emphasizes performance, which is performed more quickly than
MyISAM and InnoDB explanationInnoDB and MyISAM are the two most common table types used by many people when using MySQL, both of which have pros and cons, depending on the application. The basic difference is that theMyISAM type does not support advanced processing such as transaction processing, and InnoDB type support. The MyISAM type of table emphasizes performance, which is performed more quickly than t
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