create index

When you are learning Oracle, you may experience an Oracle index scan problem, and here's how to solve the Oracle index scan problem, and share it here. There are 4 types of Oracle index scans, depending on the type of index and the WHERE constraint:

Oracle|sql Grammar | object | Data one. Data Control statement (DML) section 1.INSERT (Insert the statement into the data sheet) INSERT into table name (field name 1, field Name 2, ...) Values (value 1, value 2, ...); INSERT into table name (field

Hints translated into Chinese is the hint, implied meaning, it is in the database role is to change the execution of SQL statements, you can use hints to force SQL in the way you set up to execute SQL, generally used to do performance diagnostics

Java EE go on continue advanced!! (This post is personally thought to be helpful to beginners, please look carefully.) Due to time haste, please correct me if there is any mistake. sql*plus FoundationIn the previous post, we mastered some basic

Create again to welcome you to the basic series of SQL (Structured Query Language) tutorials. This article describes the instructions that database definition language (DDL) uses to create databases and tables, and to modify the results of a table.

Oracle Move Command Summary Starting at 8i, Oracle begins to provide a command for move. We usually use this command to move a table segment from one tablespace to another tablespace. Move is actually the physical copy data between blocks, so we

Two myths about indexing using indexes: Using the <> and!= operators, causing queries to not use indexes First of all, please remember this conclusion: The index is not used after <> and!= are used For example, the following example uses Select

Transport table Space tablespaces, Transport_tablespace, Tts_full_check Use Exp/imp to transfer tablespace Data_tbs from a library to B library? Here is the preparation work. Create Tablespace Data_tbs; Create Tablespace Idx_tbs; CREATE table T (

function | The error of index using index three: a function based index Using a function based index (BFI, Based function Index): Starting with Oracle 8i, you can use a function based index to improve query performance. Using a function based

Oracle SQL Tuning Oracle's SQL tuning is a complex topic, and even a whole book is needed to introduce the nuances of Oracle SQL tuning. But there are some basic rules that every Oracle DBA needs to follow, and these rules can improve the

There are a lot of related to char and varchar on the Internet, but all have a long history, here reprint a piece of information relatively new, personally think to my design field decision help very much. Modern databases generally support char

sql| Backup | recovery | data | Database 1, ASP How to implement SQL database backup, restore! Answer: ASP online Backup SQL Server database: 1, Backup sql= "BACKUP database name to disk= '" &server.mappath ("Backup") & "\" & "Backuptext.dat" &

First, Introduction For data processing, sorting is one of the most basic operations. In today's computer systems, the time spent on sorting accounts for a large proportion of the system's CPU running time. Data indicate that on some commercial

oracle| data First, Oracle's dictionary tables and views can basically be divided into three levels. 1.1 x$ Table This section of the table is the basis for the operation of the Oracle database, which is dynamically created by the Oracle application

In a recent study of the Dbms_stats package, the following is a description of the execution plan based on the difference in granularity values, and we specify several parameters for the table or index statistics through the Dbms_stats package,

1. Startup instance (DB2INST1): Db2start 2. Stop instance (DB2INST1): Db2stop 3. List all instances (DB2INST1) Db2ilist 5. List the current instance: DB2 Get Instance 4. View the sample configuration file: DB2 Get DBM Cfg|more 5. Update

Here I'll discuss some ideas for enterprise-class applications of MySQL, and the ability to replace the current Oracle problem with MySQL. First of all, I am not saying that MySQL does not have a large enterprise application, in fact, you can see

server| Reference | grammar | Grammar reference I. Data definition DDL (data definition Language) Data definition 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

Package com.jadyer.lucene; Import Java.io.File; Import java.io.IOException; Import Java.text.SimpleDateFormat; Import Java.util.Date; Import Org.apache.lucene.analysis.standard.StandardAnalyzer; Import

10g online redefinition solves this problem. If the objects are created using Copy_table_dependents, the associated objects are automatically changed to their original names when the redefinition operation completes. If it is a manually created