create index

Mysql|sql Grammar | reference | data | database | Grammar reference one, data definition DDL (data definition Language) Data-setting language refers to the language defined in the format and form of data, he is the first to be set up when each

Spring Web Flow 2.0 is an extension of Spring Web MVC, which, if roughly, is equivalent to a special controller in spring Web MVC, which can be controller through XML files, so you need to configure Spring Web MVC before using Spring Web Flow 2.0,

Over the past decade, Oracle has become one of the most professional databases in the world. For IT professionals, it is important to ensure that Oracle's powerful features are used to improve the productivity of their companies. One of the most

Package com.jadyer.lucene; Import Java.io.File; Import Java.io.FileReader; Import java.io.IOException; Import Org.apache.lucene.analysis.standard.StandardAnalyzer; Import org.apache.lucene.document.Document; Import

server| Difference | index | optimization In the principle of the database, the explanation of the clustered index is that the order of the clustered index is the physical storage order of the data, but the explanation of the nonclustered index is

Problem One of the first things to do when managing SQL Server is to establish an appropriate backup plan to minimize the loss of any data in a failed event. After setting up a backup plan, of course, you have to do some database configuration,

Three. MySQL Common sense (i) field type 1.int[(M)] Normal size integer type 2.double[(m,d)] [Zerofill] Normal size (double precision) floating-point number type 3.DATE Date type. The scope of support is ' 1000-01-01 ' to ' 9

View Restrictions To create an index on a view in SQL Server 2005, the corresponding view definition must include: Any, not any OPENROWSET, OPENQUERY, OpenDataSource Arithmetic OPENXML on imprecise (floating, real) values COMPUTE, COMPUTE by

Summary: In a large number of business data processing projects, you can consider the use of partitioned tables to improve the performance of the application system and facilitate data management, this article describes the use of partitioned tables

1, Partition table: (>2G) to optimize the large table (Range partitioning,list partitioninghash partitioning,composite Partitioning) --Create a partitioned table by range 1 CREATE TABLE Sales_range 2 (salesman_id number (5), 3 Salesman_name

Reference | Reference Manual | grammar | Grammar reference DB2 provides query language SQL (Structured query Language) of the related database, which is a very colloquial, easy to learn and understandable syntax. This language is almost always

Oracle has actually introduced this feature in 11.1.0.6, but there are bugs in 11.1.0.6. Here is a brief introduction to the Remap_table feature in 11.2. Look at a simple example: Sql> select * from V$version; BANNER -----------------------------

The transaction log (Transaction logs) is a very important but often overlooked part of the database structure. Because it is not as active as the schema in the database, few people are concerned about the transaction log. The transaction log is a

Oracle| Error | resolution Analysis and resolution of Oracle Common Error codes (II.) The article originates from the century easy net Ora-01578:oracle data Block corrupted (file # num,block # num) Reason: When Oracle accesses a block of data,

The previous paragraph took over an optimization project, the requirement is to the company's existing 1W multiple tables indexed optimization, perfect existing, eliminate invalid index. In view of the serious shortage of manpower (at that time, the

1, preface   XML tree hierarchy is clear, very suitable as a configuration file. You can use DOM XML to manipulate XML in PHP. This article summarizes PHP using DOM XML to create, add nodes, and query XML files.   2, using DOM XML   XML to divide

The original knowledge of the index only knows that the index can be based on one or more columns, the B-tree index does not contain NULL, but in some cases we need to find some data through the where column name is NULL, when the database uses the

mysql| Data | Data Directory MySQL Data directory structure Blue Forest http://www.lslnet.com May 28, 2000 10:40 Author: Yan Zi Conceptually, most relational database systems are similar: They have a series of database components, each

Oracle Oracle Expert Tuning Secrets Objective 　　 Over the past decade, Oracle has become one of the most professional databases in the world. For IT professionals, it is important to ensure that Oracle's powerful features are used to improve

Some of the most commonly used SQL statement syntax for the triple compilation. Need a friend to come over to refer to the next I. Data Control statement (DML) section 1.INSERT (Insert the statement into the data sheet) INSERT into table name