Oracle

One, complex query1. List all department numbers and names of at least one employee and count the average wage, minimum wage and maximum wage of these departments.1. Determine the required data sheet: EMP Table: Can find out the number of

First, flash back technologyTo enable the database to recover quickly from any logical misoperation, Oracle exits the flash back technology. This technology can restore the data of row-level and transaction-level, reduce the time of data recovery,

Transferred from: https://www.cnblogs.com/chinalantian/archive/2011/09/09/2172145.htmlAccording to your needs to the Oracle website (http://www.oracle.com/technetwork/database/features/instant-client/ index-097480.html) to download the corresponding

I. Classification of databasesI. Classification of databases1. Small database: Access, Foxbase2. Medium database: Informix, SQL Server, MySQL3. Large database: Sybase, DB2, OracleSecond, how to reasonably use the database in the project, can be

Problem point:Upgrade to the latest version of Win10 10.0.17134, after installing the latest patch cannot remotely win server 2016 server, error message is as follows:An authentication error has occurred that requires an incorrect function, which

First, the question:Yesterday I want to modify a table in the Oracle database a field, found how the changes are not successful!!! and gives the following tips:　　ORA-54031: The column to be deleted or modified is used by a virtual column

First, the terminology of backupTurn off and on (cold and hot standby consistent and non-consistent backups) open backups can only be in archive modeAll and local local backups can only be in archive mode.Full and incremental backup incremental

Resolution: The ORA-12514 TNS Listener currently does not recognize the request service in the connection descriptorOr you can't go to the console Enterprise Manager (OEM) graphical interface after restarting your computer (add an injection listener

Change data can be generated at any time, so new changes need to be kept in sync. There are two ways to accomplish this task. The first approach can be achieved through planning. For example, create a schedule that performs a synchronization

1, modify the Rman configuration, can recover to 7 days of any point in timeSu-oracleRman Target/Configure retention policy to recovery windows of 7 days;Show All;2. Create backup database and archive log Rman script

Defined:A stored procedure (Stored Procedure) is a set of SQL statements that are compiled and stored in a database in order to accomplish a specific function. The user executes it by specifying the name of the stored procedure and giving the

The number type of Oracle is composed of up to three parts, and these three sections are the highest bit representation bits, data parts, and sign bits. Where negative numbers contain sign bits, positive numbers do not include sign bits. In addition,

2014-03-31 22:25 by Xiaoxiang Hermit, 21797 reads, 12 Comments, Favorites, compilation Oracle database sessions have five states of active, INACTIVE, killed, CACHED, sniped. A inactive state session indicates that the session is inactive, idle, and

Tag: User DDR termination process resource Release lock DBA system use UPDTerminate process mode by operating system mode and Oracle through the For Update lock table--The query needs to terminate the process, including the operating system

Complete uninstall of Oracle 12c operation steps on Windows71. Close all Oracle Services and press "Win+r" to Run "services.msc" to find all services beginning with Oracle (oraclevsswriterorcl+oracleserviceorcl+

1. Environmental description ORACLE Client Version 11.2.0.1 ORACLE Server-side version 12.2.0.1 2. Abnormal phenomenonThe client (hereafter also known as CP) accesses the server side

I. PL/SQL Developer Development ToolsPL/SQL Developer is an integrated development environment (IDE) for developing PL/SQL blocks, which is a standalone product, not a companion to Oracle.Second, PL/SQL IntroductionWhen developers use PL/SQL to

Introduction to oracle management tools, oracle management tools 1. SQL * plus is a tool software provided by oracle. It is mainly used to execute SQL statements and pl \ SQL blocks. How to use: 1) choose Start> program> oracle oradb_home10g>

How to migrate data between oracle and mysql ?, Oracle MySQL migration? Recently, some of my friends have encountered some problems. How can oracle be converted to mysql? Today, I am here to teach you how to switch First, you need to download a

Steps to completely uninstall oracle 11g Why can't oracle be easily uninstalled today if something goes wrong. 1. Disable all oracle services. You can disable it in the windows Service Manager; 2. Open the Registry: regedit open path: Run->