Oracle

WebService cannot connect to Oracle 2008-7-9Cheungmine 1 problem Source: I cannot connect to Oracle10g in WebService 2 solution:9i: added the User Authenticated Users (read and run permissions) to the ORACLE_HOME directory)Or10g: add the User

Database Name Is the name of the database, such as myoracle, which is generally only applicable to standalone machines; Global Database Name Is the name of the database in a network. For example, if the domain of the Database Host Machine is

In Oracle/PLSQL, The instr function returns the position of the string to be truncated in the source string. Syntax: instr (string1, string2 [, start_position [, nth_appearance]) String1 source string to be searched in this string. String2:

  Oracle does not automatically add primary keys. This is different from SQL Server. in Oracle, sequence and trigger must be used to increase the primary keys. 1. Create a data table Create Table test_increase (userid number (10) primary key,/*

The case expression can implement the if-then-else logic in SQL without using PL/SQL. The case method is similar to decode (), but case should be used because it is ANSI compatible. Case has two expressions: 1. Use a simple case expression to

Common Oracle database field types are as follows: Field Type Description Restrictions Other Instructions Char Fixed-length string Maximum length: 2000 bytes Varchar2 Variable-length string Maximum

On: http://mofeichen.iteye.com/blog/839111 C: \ Documents ents and Settings \ Administrator> sqlplus/nolog SQL * Plus: Release 10.1.0.2.0-production on Saturday December 26 11:08:34 2010 Copyright (c) 1982,200 4, Oracle. All rights reserved. SQL>

Program Header Create or replace package pck_pager is type t_curor is ref cursor; Procedure getrecordbypage (p_tablename in varchar2, -- table name p_strwhere in out varchar2, -- Query condition p_ordercolumn in varchar2, -- Sort columns (such as id

Configuration when a listener error occurs: |-Error 1: Oracle Database listening services often encounter errors. The Registry is deleted when the optimization software is used. Registration items of the listener service: HKEY_LOCAL_MACHINE \ SYSTEM

Use Oracle External tables to query analysis warning logs Oracle The warning logs in are recorded in the chronological order. Oracle Internal errors in the database, so that you can use this warning log to remind you that you can query the warning

AnalysisOracle Data Scanning --Oracle SQL query optimization (1) Data Reading Method 1,Oracle Data Reading: 1.1 data read operation type: In any database, when we initiate an SQL statement to query data, the SQL Execution engine scans data to return

Flexible applicationRownum virtual Column Rownum is not a physical column actually exists in the table, but a virtual column that can be used in any SQL statement. If you can correctly understand the concept and features of rownum, you can apply it

It is found that only the index can be used to obtain the opportunity to query data. If you can effectively obtain data through indexes, it will undoubtedly provide a great help for query performance. However, if the index selection is poor or the

Previously, we discussed the types of data read operations in the database, and focused on the data read methods that are useful for data read operations in local range scanning, it also discusses the impact of the database optimizer mode on

Join usageJoin)T1 {[inner] | {left | right | full} [outer]} join T2 on boolean_expressionT1 {[inner] | {left | right | full} [outer]} join T2 using (join column list)T1 natural {[inner] | {left | right | full} [outer]} join T2Inner and Outer are

Background: Myeclipse character encoding GBK Oracle Database character encoding GBK The character encoding UTF-8 that inserts content from a third party using the WebService Interface   Problem description: Pre-compiled by Java

Summary of Oracle distributed transactions () Basic Concepts Local Coordinator: in distributed transactions, you must refer to the data on other nodes to complete this part of the site. Global Coordinator: The initiator of the distributed

Author: skateTime: 2010/10/19 Insert Optimization To increase the insert speed, you must first know what affects the slow insert and generate redo and undo during insert execution. To increase the insert speed, when fully utilizing system resources,

The bulk collect usage of the Oracle database-related knowledge of batch addition, deletion, modification, is the content we will mainly introduce in this article, a key improvement of the forall statement, which can greatly simplify the code, and

We should not only write SQL statements, but also write SQL statements with excellent performance. The following sections will help the author learn, extract, and summarize some materials to share with you!(1) select the most efficient table name