create index

Objective: This paper describes a TENS data retrieval (search engine) architecture which has been tested by production environment. This article only lists the content excerpts from the previous chapters and does not provide full text content. On

asp.net|server|sql|web| Full-text Search | search engine 1 Introduction 21st century, China's Internet search engine domain can be described as crowded, Baidu, Yahoo, search, Sogou and so on have resorted to the attention of netizens. These big

oracle| Performance | optimization 43. Where to replace the order by The ORDER BY clause uses the index only under two strict conditions. All columns in the order by must be contained in the same index and remain in the index. All columns in

1. sh File contents The file name in this article is example.sh, which reads as follows: #!/bin/bash function Init () { If [-F "Example.sql"] Then echo "Example.sql is exits and is deleting it,then recreate it" Rm-fexample.sql Else echo

This is a question that is often asked. In particular, when using Oracle, the client would have a problem with SQL Server, which is that SQL Server behaves differently from Oracle on top of NULL values. In Oracle, a null value is considered to be

Oracle First chapter: Log Management 1.forcing Log Switches sql> alter system switch logfile; 2.forcing checkpoints Sql> alter system checkpoint; 3.adding Online Redo Log groups sql> ALTER DATABASE Add logfile [Group 4] Sql> ('/disk3/log4a.rdo ',

I. 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 database is to be established, what is the form of data, the form of a

One, the importance of indexing Indexes are used to quickly find rows that have a specific value in a column. Without indexing, MySQL must start with the 1th record and read through the entire table until the relevant rows are found. The larger the

Oracle second part, Oracle Architecture system [Q] Oracle has those data types [A] common types of data are Char fixed length character value field, maximum length up to 2000 bytes NCHAR a fixed-length character value field of a multibyte character

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

First, the preface See a document about SQL Server table partitioning on MSDN: Special guidelines for partitioned indexes, it's harder to understand the meaning of a document if you don't have actual experience with the table partition. Here I will

access| Tips | Statement where you should pay attention to using SQL statements in Access and some tips Quote: Fred The following SQL statement tests through the query in Access XP Build table: Create Table TAB1 ( ID Counter, Name String, Age

The partition key value of the list partition table is a discrete value, so it has DDL maintenance statements that are unique to other partitions, ADD values, and Dorp values. Add values and drop values increase or decrease the corresponding

This paper mainly describes how to accelerate the Dynamic Web site MySQL index analysis and optimization. One, what is an index? Indexes are used to quickly look for records with a specific value, and all MySQL indexes are saved as a B-tree.

In the process of using Oracle, we often encounter some Oracle errors, for beginners, these errors may be a little fuzzy, and may not know how to deal with these errors, I used to appear in the more frequent error code one by one to make analysis,

Part I: Profile concept Oracle database 10g uses a new approach called SQL configuration files to compensate for the drawbacks of storage profiles, DBAs can use SQL Tuning Advisor (STA) or SQL Access Advisor (SAA) to identify SQL statements that

Basic Tutorials | tutorials | statement |MYSQL Downloads provide some MySQL statements that are often used in php+mysql development and are available to beginners for reference and collection.Are some of the most commonly used and useful sentences.

1, the concept of the index An index is a database object that is used to speed up data access. Reasonable use of indexes can greatly reduce I/o times. 2, the function of the index: The record is sorted, speed up the query speed of the table. 3,

Stored Procedures | data | structure/****************************************************************************/ /* */ * FileName:bbs.sql * * /* */ /* DESCRIPTION:BBS Data structure * * /* */ /* Table: * * /* */ /* Procedure: * * /* */ /*

Data | database | Index Then, a little bit more complicated, what if there is an ORDER BY clause? Believe it or not, most databases will benefit from the index when they use the order by. SELECT * FROM MyTable WHERE category_id=1 and