myisam vs innodb performance

Label:As a Java web Developer, the differences between the two types of engines are quite good for MySQL databases, and the following is an introduction to the understanding of the two types of engines I've accumulated at work. MyISAM: If you do not change the MySQL configuration file (My.ini), MyISAM is the default storage engine for MySQL, each MyISAM table cor

the lock concept in MySQLDifferent storage engines in MySQL support different locking mechanisms. For example, the MyISAM and memory storage engine with table-level locks, bdb with a page lock, also supports table-level locks, InnoDB storage engine supports both row-level locks, table-level locks, by default, row-level locks.The MYSQL3 lock features are as follows:Table-level locks: low overhead, lock block

MyISAM and InnoDB explain InnoDB and MyISAM are the two most common table types that many people use 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 tr

1 MyISAM only load the index into memory, the data cache depends on the operating system, InnoDB the index and data are loaded into the memory buffer2 MyISAM The data in the database is saved in the order inserted, the address of the corresponding data row is saved in each index node, the primary key index is theoretically the same as other indexes, the data in t

Label:View the supported database engines for the current database and the default database engine Mysql> show engines; +--------------------+---------+----------------------------------------------------------------+-------------- +------+------------+ | Engine | Support | Comment | Transactions | XA | savepoints | +--------------------+---------+----------------------------------------------------------------+-------------- +------+------------+ | Performance_schema | YES |

saved. Note that when the count (*) statement contains the where condition, the operations on the two tables are the same.3. For fields of the auto_increment type, InnoDB must contain only the index of this field. However, in the MyISAM table, you can create a joint index with other fields.4. When deleting from table, InnoDB does not create a new table, but dele

A. The difference in composition:InnoDB only one file is stored on disk. frmEach myisam is stored as three files on disk. The first file name starts with the name of the table, and the extension indicates the file type:File Store table definition. frmThe data file has an extension of. MYD (MYData)the extension of the index file is. MYI (Myindex)A disk-based resource is a InnoDB tablespace data file and its

MyISAM and InnoDB engine optimization 1. Public options www.2cto.com skip-external-locking // avoid MySQL external locks, reduce the chance of errors and enhance stability. Skip-name-resolve // disables MySQL from performing DNS resolution on external connections. This option can eliminate the time for MySQL to perform DNS resolution. However, if this option is enabled, IP addresses are required for all rem

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

What is the choice between myisam and innodb? Seven or eight tables in the database may have millions or even tens of millions of data records, and all the large tables have been partitioned. Version 5.1 None of the other tables may be available, The update and insert operations on large data tables are frequent, What kind of engine will be used for table operation speed (especially for select of all t

Label:1. Storage structure MyISAM: Each MyISAM is stored on disk as three files. The first file name begins with the name of the table, and the extension indicates the file type. frm file stores the table definition. The data file has an extension of. MYD (MYData). The extension of the index file is. MYI (Myindex).InnoDB: All tables are stored in the same data fi

Tags: fix over definition truncate space COM build data file commit1. Storage structure MyISAM: Each MyISAM is stored on disk as three files. The first file name begins with the name of the table, and the extension indicates the file type. frm file stores the table definition. The data file has an extension of. MYD (MYData). The extension of the index file is. MYI (Myindex).

Tags: SQL class nod Inno HTTP advantage authorization using SELECTMySQL database InnoDB and MyISAM differences and how to choose:Difference:1. InnoDB support transactions, MyISAM is not supported, for INNODB each SQL language is encapsulated as a transaction by default, auto

differentiate it from InnoDB's clustered index.InnoDB Index Implementation Although InnoDB also uses B+tree as the index structure, the implementation is quite different from MyISAM. The first major difference is that the InnoDB data file itself is the index file. As you know above, the MyISAM index file and the data

MyISAM index is also called "nonclustered," and is so called to distinguish it from the InnoDB clustered index. InnoDB Index Implementation Although InnoDB also uses B+tree as the index structure, the implementation is different from MyISAM. The first major difference is th

I used it for installation. Therefore, when setting databaseusage (for example, 1), follow the official discuz suggestions, all selected are Non-TransactionalDatabaseOnly (only Non-transaction databases of MyISAM data engine are supported). InnoDB is not required for MyISAM databases, so INNODB engine is not directly l

writing data during data read 4, you can set the cache index through key_buffer_size, improve the performance of access, reduce the pressure of disk IO5, using MyISAM storage engine to write or read the row data separately, the speed is more block and occupy less resources6. The MyISAM storage engine does not support foreign key constraints, only full-text

Key_buffer_size -This is very important for the MyISAM table. If you are using only the MyISAM table, you can set it to the 30-40% of available memory. A reasonable value depends on the size of the index, the amount of data, and the load.Remember, the MyISAM table uses the operating system's cache to cache the data, so you need to set aside some memory for them,

Performance Comparison Test of MyISAM and InnoDB table storage structures in MySQLMyISAM table. The MyISAM storage format is the default type in MySQL since MySQL version 3.23. It has the following features:■ If the operating system itself allows larger files, the files are larger than the isam storage method.■ Data is

: What is the difference between MyISAM and InnoDB in mysql? How to optimize the MYSQL database ?, If you are interested in the PHP Tutorial, refer. Basic differences between MyISAM and InnoDB 1. InnoDB does not support FULLTEXT indexes. 2.