Oracle

Oracle export Utility Program (Export utility) allows you to extract data from a database and write the data to an operating system file. The basic format used by Exp: exp [username [/password [@ Service]. The following example shows the common

If you want to access the tables or views of another database server from one database server, you can use the dblink method to achieve basically the same effect as local access, as shown below: Select * From A @ dblink_ B; You can create a dblink

Uninstall procedure: 1. Start-> set-> Control Panel-> Administrative Tools-> services-> stop all Oracle services. (You do not need to stop it if it is not started) 2. Start->Program-> Oracle-oradb10g_home1-> Oracle Installation products->

Problem description: when installing Oracle for 10 Gb, "Checking Network Configuration Requirements... check complete. The overall result of this check is: not executed solution: Oracle supports installation on a system with IP addresses

If the character set of the Server Client is improperly set in the Oracle database, the data stored in the database will not be properly saved, or the data in the database cannot be properly displayed on the client, code corruption

The Oracle password file is used to store the passwords of all users who connect to the database with the sysdba or sysoper permission. to remotely connect to the database with the sysdba permission, you must use the password file. Otherwise, you

No dirty reads occur. User A has updated the table and has not submitted the table. User B queries the table. unsubmitted updates cannot appear in the user's query results. Instance simulation: the data in the test table is as follows: 1. User a

In pl SQL, collection is an object composed of a group of ordered elements. The types of these elements must be consistent. Pl SQL divides collection into three types: associative arrays (also called index-by tables), nested tables, and

1. Date interval operation Current Time minus 7 minutes Select sysdate, sysdate-interval '7' minute from dual Current Time minus 7 hours Select sysdate-interval '7' hour from dual Current Time minus 7 days Select sysdate-interval '7' day from

Simple configuration for Oracle 9i full-text retrieval1. PrerequisitesAll Oracle 9i instances are supported by default, as shown in the following figure.The ctxsys user and ctxapp role exist in the system,The listener supports full-text retrieval,

Differences between struts1 and struts2: 1) Comparison of Action Implementation classes: struts 1 requires action classes to inherit an abstract base class; a specific problem of struts 1 is the use of abstract class programming rather than

Rank () sorts data in a table hierarchically. For example, student_result Name number Kemu fenshu Li 0113101 High 90 Zhang 0113098 high 80 Wang 0113077 High 70 Li 0113101 physical 80 Zhang 0113098 physical 90 Wang 0113077 physical 70 If I want to

In the dynamic performance view of Oracle, V $ SGA has no other views. The structure is as follows: SQL> DESC v $ SGAIs the name empty? Type-------------------------------------------------------------------------------------------------Name varchar2

Application of Oracle Data Snapshot technology in data exchange The author of this article (Pan chengbin), please read this article to respect the author's copyright. Abstract: This article introduces the application of Oracle Data Snapshot

The business secrets contained in Oracle stored procedures are sometimes unwilling to be seen by third-party personnel. They can be achieved through encryption of stored procedures. There are two methods to encrypt the stored procedure: here we will

The following code is available: Declare --Query EMP.Name Cursor cur_emp Is Select empno,Ename,Job From EMP Where empno=7369 ForUpdate of ename; Begin ForReturn_cur in cur_emp Loop Update EMP Set ename='Lhg' Where current of cur_emp; End

This article uses Scott as an example to illustrate how to install oracle11g: Download link: Http://www.oracle.com/technetwork/cn/database/enterprise-edition/downloads/index.html I registered at the Oracle official website, you can directly use:

Error message:Win Event Viewer: An error occured while trying to initialize the service. Manual start: emctl start dbconsoleEnvironment Variable oracle_sid not defined. Please define it.When set oarcle_sid = orcl is executed, an error is

From: http://www.dba-oracle.com/t_detecting_duplicate_indexes.htm Really amazing SQL. Select/* + rule */A. table_owner,A. table_name,A. index_owner,A. index_name,Column_name_list,Column_name_list_dup,DUP duplicate_indexes,I. uniqueness,I.

1. About Bare Devices 1.1 What is a raw device) A bare device is a raw partition or raw logical volume that has not been created for a file system. Character device driver to access it. How to read and write data on the device depends on the