key index

Index | performance ORA FAQ Performance Tuning Series-- The Oracle (tm) Users ' co-operative FAQ Why would a reverse index to useful when the leading column of the "index is" generated from a sequence? When the first column of the index is generated

This article from how to build MySQL index and introduce the type of MySQL index, and then talk about the pros and cons of MySQL index, as well as the place to be aware of when building an indexFirst of all: first assume that there is a table, the

This article brings to you the content is about MySQL database optimization method Summary, has certain reference value, has the need friend can refer to, hoped to be helpful to you. Learning, database optimization is divided into all aspects, here,

Introduction to IndexesAn index is a structure that sorts the values of one or more columns in a database table, such as the name (name) column of the employee table. If you want to find him or her by the name of a particular employee, the index

Introduction to IndexesAn index is a structure that sorts the values of one or more columns in a database table, such as the name (name) column of the employee table. If you want to find him or her by the name of a particular employee, the index

Reprint: http://www.cnblogs.com/djcsch2001/articles/1823459.htmlIndex, index creation, modification, deletionIndexAn index is an object in a relational database that is used to hold each record, and the main purpose is to speed up the reading speed

About MySQL OptimizationBecause the page static technology can realize the cache of dynamic data, sometimes it is necessary to request the database. Therefore, the optimization of the database is also indispensable.Optimization ideasDesign: Storage

Index, index creation, modification, deletion2007-10-05 13:29 Source: User reviews 0 Views 2986IndexAn index is an object in a relational database that is used to hold each record, and the main purpose is to speed up the reading speed and integrity

I. Index of MYISAMMyISAM indexes are stored separately from Row records, called Nonclustered indexes (unclustered index).There is no essential difference between the primary key index and the normal index: Areas with contiguous aggregation

is an internal method of SQL Server orchestration data. It provides a way for SQL Server to orchestrate query data what is an indexTake the Catalogue page (index) of the Chinese dictionary for example: Just as Chinese characters are stored on pages,

What is an indexTake the catalogue page of the Chinese Dictionary (index) analogy: Just as Chinese characters are stored on pages, SQL Server data records are also stored on a per page basis, and each page capacity is typically 4K . In order to

Index, index creation, modification, deletion2007-10-05 13:29 Source: User reviews 0 Views 2986IndexAn index is an object in a relational database that is used to hold each record, and the main purpose is to speed up the reading speed and integrity

1, MySQL system time automatic acquisition:      column type           display format    TIMESTAMP (+)   yyyymmddhhmmss   TIMESTAMP (  yymmddhhmmss  ); TIMESTAMP (Ten)   yymmddhhmm   TIMESTAMP (8)    yyyymmdd   TIMESTAMP (6)    yymmdd  

String correlation (sort, data structure)ObjectiveIn the fifth chapter of the algorithm, is related to the string of various processing operations, in peacetime processing, in fact, found all the language, can not be separated from the string, and

MySQL Database optimization techniques:The optimization of the database is a comprehensive technology, which mainly includes: 1. The design of the table is reasonable (in accordance with the three paradigms, 3NF) 2. Add an appropriate index

indexing, setting up, modifying, deleting2007-10-05 13:29 Source: User reviews 0 Views 2986IndexAn index is an object in a relational database that is used to hold each record, and the main purpose is to speed up the reading speed and integrity

What is an indexTake the Catalogue page (index) of the Chinese dictionary for example: Just as Chinese characters are stored on pages, the data records in SQL Server are stored as pages, and the capacity of each page is typically 4K. In order to

1. Display the list of databasesshow databases; # View all current databasesShow Databases \g #以行的方式显示2. On the command line, execute the SQL statementMysql-e ' show databases '-uroot-p123456mysqlshow-uroot-p123456 # not used, just remember the one

What is an indexTake the Catalogue page (index) of the Chinese dictionary for example: Just as Chinese characters are stored on pages, the data records in SQL Server are stored as pages, and the capacity of each page is typically 4K. In order to

1. Index typeWhen you create an index, you can specify whether the index can contain duplicate values. If not included, the index should be created as a primary KEY or a UNIQUE index. For single-column uniqueness indexes, this guarantees that a