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Oracle undo complexity-oracle Core Technology Reading Notes 4, undo-oracle I. Overview Undo stores old data. For example, if you modify A record to change abc of column A to def, abc is saved in undo. There are two purposes: 1. if your transaction has not been committed, but you have modified column A, when someone else reads this data, they should not be able to

The Data Guard is Oracle's remote replication technology, which has physical and logical points, but in general it needs to have a separate system in place, where two hardware configurations can be different, but the software structure of the two systems is consistent, including software versions, directory storage structures, As well as the data synchronization (in fact, is not real-time synchronization), the two systems as long as the network is available, is a remote disaster-tolerant solutio

Oracle Easy Interface ToolBackground: I work on a remote machine, I need to call data to the Oracle 11g server, the Oracle client is already installed on the remote machine, but neither SQL Plus nor SQL developer and PL SQL developer are available (DBAs don't fix it for a few days). I have the server IP, Oracle user na

Oracle Performance Analysis 5: Index Structure and scan mode of data access methods, oracle Index The previous article describes full scan. This article describes the index structure and scan methods, and describes each scan method later.When Oracle searches for the values of a specific column or multiple columns through an index, it performs an index scan. First

Oracle Database Programming, oracle Database tutorial 1. How to learn about Oracle 1. Database Administrator Manage Oracle (Start and Stop, database fault recovery)Improves Oracle performance (allocates memory) and optimizes the data storage structure ...... 2. database prog

I. Overview of Oracle Architecture:Oracle's architecture refers to the composition of the database, the working process and principle, and the Organization and management mechanism of the data in the database. To understand the architecture of the Oracle database, you must understand the important concepts and major components of the Oracle system.The

Oracle concept (Oracle 10.2) 10. Application Architecture This chapter defines the application architecture and describes how Oracle database servers and database applications work in a distributed processing environment. This architecture can be applied to almost any type of Oracle Database system environment. This ch

Tags: let stp knowledge iptables Owner system SPFile splay Post Oracle LINUX 6.3 + Oracle 11.2.0.3 RAC + vbox Installation documentation 2015-10-21 12:51 525 people read Comments (0) favorite reports Classification:Oracle RAC Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced. VBOX + Oracle Linux 6U3 +

Oracle Silent Installation and oracle Silent Installation Download the oracle installation package: : Note: To download oracle, you must register oracle. Http://download.oracle.com/otn/nt/oracle11g Download two packages: Linux.x64_11gR2_database_1of2.zip Linux.x64_11gr2_dat

ORACLE Installation./runInstaller reports "You are attempting to install 64-bit Oracle on a 32-bit operating system., yuminstalloracle Prepare to install the oracle database, see: http://blog.csdn.net/mchdba/article/details/43086037 1. solution (1): Ignore system prereqs[Root @ powerlong5 database] # export displayed = 192.168.121.218: 1.0 [Root @ powerlong5 dat

oracle| process Oracle Process Memory Architecture-how to view memory consumed by Oracle processes Last Updated:sunday, 2004-11-28 11:12 eygle It is often asked how the memory resources consumed by the process are determined under UNIX, and why the top tool is displayed very high. Some people say that the output of top is not accurate, this argument is not e