mysql innodb

For most applications, access to hotspot data exists, that is, the Access Frequency of some data in a certain period of time is much higher than that of other data.Common hot data includes "the latest news", "the most popular news", and "movies with

Analyze Mysql InnoDB indexes and mysqlinnodb Indexes Abstract: This article introduces the InnoDB Index-related knowledge of Mysql, from various trees to the indexing principle to the details of storage. InnoDB is the default storage engine of Mysql

Mysql innodb engine's shared and independent tablespaces, mysqlinnodb For innodb data storage files, we must first solve two conceptual problems: Shared tablespace and exclusive tablespace. (The innodb engine and MYISAM engine are very different. In

Mysql innodb insert intention lock, mysqlinnodb Innodb has an insert intention lock, specifically for Insert. If the gap is already locked by the gap before insertion, insert will apply for the Insert intention lock. So what is the role of this

For most applications, access to hotspot data exists, namely:The Access Frequency of some data in a certain period of time is much higher than that of other data..Common hot data includes "the latest news", "the most popular news", and "movies with

Memory in MySQL InnoDB architecture, mysqlinnodb First 1. Buffer PoolThe InnoDB Storage engine is based on disk storage and manages records on pages. The buffer pool is usually used to improve the overall performance of the database. The buffer

MySQL InnoDB Storage engine table (2), mysqlinnodb This article continues the unfinished part of the previous article. 4. InnoDB Data Page StructurePage is the minimum disk unit for the InnoDB Storage engine to manage databases. A page of B-tree

How does mysql INNODB engine lock work? let's test it. MysqlSELECTVERSION (); 43; ----------- 43; | VERSION () | 43; ----------- 43; | 5520 | 43; ----------- 43; 1. what is the principle of the INNODB engine lock of rowinset mysql, to perform a test.

Mysql-innodb lock classification bitsCN.com I. innodb row lock classificationRecord lock: record lock, that is, only a single row is locked.Gap lock: interval lock. Only one interval is locked. (note that the interval here is an open interval, that

MySQL InnoDB shared tablespace and independent tablespace Shared tablespace All the table data of a database is stored in one file, and the file path of the shared tablespace is under the data directory by default. The default file name is ibdata1

Check out the "engine" concept first. Engine is the core component of a development program or system on an electronic platform. Using the engine, developers can quickly build, lay out the functions required by the program, or take

MySQL's locking mechanism is relatively simple, the most notable feature is that different storage engines support different locking mechanisms. InnoDB supports row locks and sometimes upgrades to table locks; MyISAM only supports table locks.Table

MySQL is first configured in Menuconfig, specifically in Utilities->database->mysql-server. This can be compiled directly, but this default is not supported by the INNODB storage engine, it is estimated that the openwrt is generally run by the

InnoDB consists of several componentsFirst, Innodb_buffer_pool:1 It is primarily used to cache data and indexes (precisely because the tables in InnoDB are organized by a clustered index, so the data is not the leaf node of the index of the primary

Background and phenomenonIn some cases, the online production environment often occurs with a deadlock in the database operation, which prevents the business personnel from operating. After the DBA's analysis, there was a deadlock in the insert

Master Thread The core background thread is responsible for asynchronously flushing the data in the buffer pool to disk, ensuring data consistency, including dirty page refreshes, merge insert buffering, Undo page Recycling, and so on. master thread

Through elk monitoring found that the program connection MySQL DB failed, by looking at the program log and MySQL error log found in MySQL errorView MySQL LogsDiscover InnoDB:Error:table ' mysql '. ' innodb_table_stats ' does not exist in the

The cardinality is placed on the MySQL storage engine layer. The sampling value is taken.In the InnoDB storage engine, updates to cardinality statistics occur in two operations: Insert and updateThe update policy is:-1/16 of the data in the table

A: a master thread (InnoDB almost all functions on this thread)B: A lock monitoring threadC: An error monitoring threadD: Four IO threads (insert buffer thread\log thread\write thread\read thread)The number of IO threads can be increased by the

If the data in the MySQL production database on the line is mistakenly deleted, and the DBA goes to recover the data, it is discovered that the database is not backed up, Binlog, or open. Is there any other means to try to recover the data? Percona