mongodb storage engine

Tags: index, storage engine##########################################################MySQL index:A directory similar to a bookType:--"Normal index"--"Unique index uniquely--"PRIMARY key primary Key"-Foreign key foreign keyAdvantages:Improve query speedDisadvantages:Slows down the write speed########################################################################################One, ordinary index: IndexView

Tags: frequency code Auto Submit application appears complete 5.5 BSP importantMyISAM Storage EngineMySQL system tables Many use the MyISAM engine Transaction not supported Table-level lock, update data on table lock Reads and writes are blocked, but read is not blocked The cache caches only the index, through the Key_buffer_size cache index Reads faster, consumes less resources

The storage engine is located on the third tier of MySQL's logical architecture, responsible for storing and extracting data from MySQL. There are many MySQL storage engines, and different storage engines have different ways of saving data and indexes. Each storage

MySQL message storage engine Q4M trial bitsCN.com 1. install and download the binary package: because mysql is 5.1.48, select the corresponding package from the official website. http://q4m.kazuhooku.com/dist/old/ Decompress the package. copy support-files/q4m-forward to mysql installation directory/bin B. copy libqueue_engine.so to the mysql installation directory/lib/mysql/plugin and execute: $ cat suppor

engineBDBAnother option for transactional databases originating from Berkeley DB, supporting other transactional features such as commit and rollbackMemoryAll data is placed into the memory of the storage engine, with extremely high insertion, update and query efficiency. However, it occupies a memory space that is proportional to the amount of data. And its contents are lost when MySQL restartsMergeCombin

Label:First, the Engine foundation 1 Viewing system-supported storage engines 　　Show engines; 2 View the storage engine used by the table in two ways: A, Show table status from database_name where name= ' table_name '; b, show create TABLE table_name; To view the default engines used: 　　Show variables like ' default_st

Storage Engine is a major feature of MySQL, learning MySQL must understand it, know its various engines differences, how to choose and use the right. So it's a brief introduction.1. Look at the types of engines supported by the system, such as the commands in.2. Set the system to use a specified storage engineThere are many ways to specify a

Tags: led dynamic table memory static air error two disadvantages of ISAView current MySQL storage engine: Show engines \g or show variables like ' have% '; 　　 Both of these methods see which storage engines are supported by the current database, where disavled records indicate support for the storage

Label:1 The concept of the MySQL storage engine The data in MySQL is stored in files (or memory) in various different technologies, using different storage mechanisms, indexing techniques, locking levels, and ultimately providing a wide range of different functions that can be used to achieve additional speed or functionality by selecting different techn

Tags: MyISAM isa record performance optimization Another recovery data dictionary corruption rollbackMysql uses a plug-in storage engineMysql Architecture MySQL service layer Storage Engine Layer All belong to the storage engine MyISAM

MySqlStudy case-MySql System and storage engine 1. Database and instance Database: a collection of physical operating system files or other forms of file types. In MySQL, database files can be files ending with frm, myd, myi, and ibd. When the NDB engine is used, database files may not be files on the operating system, but files stored in the memory MySql Study C