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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

How to uninstall the "hidden oracle" software installed after an error is reported, and the hidden oracle **************************************** ******************************** ************** Original Works are from the blog of "Deep Blue blog". You are welcome to repost them. Please indicate the source when you repost them. Otherwise, the copyright will be held legally responsible. Please leave a messag

NBU reconfiguration leads to unsuccessful recovery-link, NBU-Oracle of oracle and nbu[Root @ SsevendbS01 rman] # su-oracle [oracle @ SsevendbS01 ~] $ Rman target/Recovery Manager: Release 11.2.0.3.0-Production on Fri Sep 19 09:47:47 2014Copyright (c) 1982,201 1, Oracle and/o

CLOSED/SYNCD/DVDSAPMNTLV JFS2 2 closed/stale/sapmntusrsaplv JFS 2 3 Closed/syncd/usr/saporaclelv JFS2 2 Closed/syncd/orac LEORAPRDLV JFS2 2 closed/syncd/oracle/prdoradate1lv jfs2 6144 1228 8 8 closed/stale/oracle/prd/sapdata1oradate2lv jfs2 6144 12288 closed/stale/oracle/prd/s APDATA2ORADATE3LV JFS2 3200 2 closed/stale/

ALL_TAB_PRIVS_RECD represents the permissions on an object that the user is public or grantee Dba_col_privs all authorizations on the database column Dba_role_privs show roles that have been granted to a user or other role Dba_sys_privs system permissions that have been granted to a user or role Dba_tab_privs all permissions on a database object ROLE_ROLE_PRIVS displays the roles that have been granted to the user ROLE_SYS_PRIVS displays system permissions granted to users through roles

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

In Oracle Linux 5, we can use ORACLE validated configuration to accelerate the deployment of the Oracle environment. For more information about validated deployments, see: Oraclevalidated configurations installation instructions Http://blog.csdn.net/tianlesoftware/article/details/7061684 In Oracle Linux 6,

Oracle Study-Oracle RAC reconstruction Control File System Environment:Operating System: AIX5.3 Cluster: Oracle 10gR2 CRSOracle: Oracle 10gR2 Rebuild the control file in the RAC environment is similar to that in a single instance, but note the following steps:[Oracle @ aix21

[ORACLE] processing of oracle string objects, oracle string objects 2.1 char field, varchar2 Field (1) Defining the field length char (10) indicates that the field can contain 10 English characters (regardless of the encoding method, do English characters occupy 10 bytes ?), The physical space is always allocated with 10 characters. The variable length varchar (1

[ORACLE] processing of oracle time objects and oracle object processing 1.1 Use of oracle date objects (1) Create A date Field For example, Create table foo_7 (d1 date ); (2) Use the to_date function to insert a date object. To_date ('string', 'string' format ') For example, Insert into foo_7 values (to_date ('August 1

When a client of Oracle 9i or later is connected to a server of Oracle 8i or later versions, all the Chinese data queried becomes garbled. The query finally solved the garbled problem. The development tool is ASP. NET (C #) + Oracle, using system. Data. oracleclient to connect to the Oracle database. Solution 1 (the fi

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