Oracle

1. Explain the differences between cold backup and hot backup and their respective advantagesAnswer: Hot Backup is applicable to databases in the archive mode. When the database is still in the working state, it is backed up. Cold backup refers to

This article describes how to create a database link to implement cross-database Oracle query. 1. Configure the tnsnames. ora file of the Local Database Server $ VI $ ORACLE_HOME/Network/admin/tnsnames. ora Add the following lines, where

Log on to the Oracle database through PL/SQL, and then execute the menu: File/New/command window, open a command window, and then execute the script in the Command window to create and delete tablespaces. Create a tablespaceSQL> Create tablespace

  Below I will test the main data access methods of the Oracle database on the. NET platform. The following is a test table:   Create Table customers ( "Customer_id" number not null, "First_name" varchar2 (255 char) not null,

Add a column: Alter table emp4 add Test varchar2 (10 ); Modify a column: Alter table emp4 modify test varchar2 (20 ); Delete a column: Alter table emp4 drop column test;   Here pay attention to a few places, first, add and modify the column

Microsft ole db provider for Oracle report "Test connection failed because of an error in initialize provider" I am too lazy to find a solution. I will change provider to Oracle provider for OLE DB directly. Recently, a colleague has discovered a

In the financial system or other report statistics function, I want to have a lot of cases similar to the following report. With the grouping_id function, it will be easy to implement, and it will be very expensive.  

Navicat Oracle features an intuitive GUI and provides powerful visualization tools such as query editor and syntax highlighting capabilities when previewing SQL, SQL console, text, hexadecimal and blob view/Editor, ssh tunnel and more to improve

Next to Oracle fusion middleware I: database and RCU, this article describes the installation of Weblogic, UCM (webcenter centent), and webcenter portal. 1. WebLogic selects 10.3.6.0 and can be installed using the Installation File of jdeveloper 11.

1. view the directory object of the data pump. The directory object is the file path stored when the data pump exports data:   SQL> SELECT * FROM dba_directories; OWNER DIRECTORY_NAME DIRECTORY_PATH-----------

Decode () can only create new columns (horizontal scaling), while the max () function is used to reduce the number of rows of the same category (vertical compression ), in this way, the original thin database record set is converted into a

Yesterday, I suddenly found that the Oracle server I installed does not have scott users, so I cannot import it manually. Specific Method: First, log on with the system user. Import the scott. SQL script (which can be found in the oracle

Select * from dictionary; -- Data Dictionary A data dictionary is a place where Oracle stores database information. It is used to describe data. For example, the Creator information, creation time information, tablespace information, and user access

1. parameter file How to view parameters Show parameter name Select * from v $ parameter Server parameter file Spfile is an important change in ORAcle. With PFILE, it can eliminate two serious problems in traditional parameter

  Enable SQL plus Find a user to log on Finally, enter commit; Microsoft Windows XP [version 5.1.2600] (C) Copyright 1985-2001 Microsoft Corp. C:-Documents and Settings-Administrator> sqlplus/nolog SQL * Plus: Release 10.1.0.2.0-Production on

A project needs to read data from the Oracle database, during deployment, the system always prompts "requires oracle client software 8.1.7 or later". Finding information from the Internet also means you need to set permissions after installing the

1. Connect to the serverGraphical interface: Open the Enterprise Manager of SQLSERVER and expand the corresponding DATABASE. Under Security, there is a project linked to the server. Right-click to addNote: You must have the administrator

1. Definitions and functions of parameter filesThe oracle Database configures the database through a series of parameters. These parameters are displayed in the form of key-value pairs, such:MAXLOGFILES = 50BACKGROUND_DUMP_DEST = C: \ DUMPHere, the

Check that the DATABASE is connected to the tnsping database and listens to lsnrctl to view SIDSQL> SELECT * from v $ INSTANCE; SQL> SELECT * FROM V $ DATABASE; SQL>/execute the previous operation command SQL> edit read command cache view language

Alter any cluster: modify the permissions of any cluster Alter any index Alter any role Modify permissions of any role Alter any sequence Alter any snapshot Alter any table Alter any trigger Alter cluster Modify permissions on clusters Alter