key index

First, the concept of the index Index is similar to look up a dictionary, through pinyin, strokes, only a few steps can find the word. Database, through the index, as long as a small amount of reading, you can find the required records.

The Oracle tutorial you are looking at is a number of ways to optimize the design of Oracle library tables. ObjectiveThe vast majority of Oracle database performance problems are caused by unreasonable database design, only a small number of

1 background 11.1 Mvcc:snapshot Read vs current Read 21.2 Cluster Index: Clustered Indexes 31.3 2pl:two-phase Locking 31.4 Isolation Level 42 A simple SQL Lock implementation Analysis 52.1 Combination one: ID primary key +RC 62.2 Combination two: ID

1 background 11.1 Mvcc:snapshot Read vs current Read 21.2 Cluster Index: Clustered Indexes 31.3 2pl:two-phase Locking 31.4 Isolation Level 42 A simple SQL Lock implementation Analysis 52.1 Combination one: ID primary key +RC 62.2 Combination two: ID

The first part: basic knowledge Index The official introduction index is a data structure that helps MySQL efficiently get data. I understand that the index is equivalent to a book directory, through the directory to know where to go, without a

1. BackgroundMysql/innodb's locking analysis has been a difficult topic. In the course of my work, my colleagues have often consulted on this issue. At the same time, the micro-blog also often receive the MySQL lock-related private messages, let me

This article mainly summarizes the MySQL index operation methods, including creating indexes, rebuilding indexes, querying indexes, and deleting indexes. In the following example, 'table _ name' indicates the data table name, 'index _ name'

Mysql database optimization Summary I. Common Database optimization operations 1. The table design must conform to the three paradigm. 2. Add an appropriate index, which has a great impact on the query speed. You must add an index. Primary Key Index,

Primary key, Primarykey. Indexed, index. The primary key usually corresponds to a unique key. Primary key corresponds to a unique, which is essentially meaningless, but a constraint.However, when establishing primary key and unique key, the

Database index PrincipleWhen you encounter a new knowledge, you can learn it through the what-why-how method. Below we will learn the database index through this method.What is database index?Definition 1: an index is a structure used to sort the

Mysql database optimization summary and mysql database Summary I. Common Database optimization operations 1. The table design must conform to the three paradigm. 2. Add an appropriate index, which has a great impact on the query speed. You must add

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First, IntroductionMYsql The default lock level for the engine:MyISAM and memory Use table-level locks (table-level locking).The BDB uses page locks (page-level locking) or table-level locks, which are page locks by default.InnoDB supports row-level

Naming rules: Table name _ Field name1. Fields that need to be indexed, in the Where condition2. Fields with low data need not be indexed3, if the Where condition is an OR relationship, index does not work4, accord with the left

Summary:This article is for reference to other people's articles (http://blog.csdn.net/voidccc/article/details/40077329)1 Various tree-shaped structuresOriginally not intended to start from the two-fork search tree, because there are too many

Summary:This article describes MySQL's InnoDB index-related knowledge, from a variety of tree-to-index principles to the details of storage.InnoDB is the default storage engine for MySQL (Mysql5.5.5 before MyISAM, documentation). Based on the

Summary:This article describes MySQL's InnoDB index-related knowledge, from a variety of tree-to-index principles to the details of storage.InnoDB is the default storage engine for MySQL (Mysql5.5.5 before MyISAM, documentation). In the purpose of

Http://www.bubuko.com/infodetail-1861798.html1 Various tree-shaped structuresOriginally not intended to start from the two-fork search tree, because there are too many related articles on the Internet, but considering the clear diagram of the

I have been working for a year. It is also the first time I have used Mysql indexes. I was amazed at the speed improvement after I added an index. When the old employee next door saw my big fuss, he calmly replied, surely? The index is the most

MySQL lock processing analysis (InnoDB) Background MySQL/InnoDB lock analysis has always been a difficult topic. During my work, I often ask questions from my colleagues. At the same time, Weibo often receives MySQL lock-related private messages,