Oracle

Oracle website DownloadHttp://www.oracle.com/technetwork/database/enterprise-edition/downloads/112010-win64soft-094461.htmlOracle InstallationThe download consists of two compressed packages:

Original address: http://blog.csdn.net/u011721927/article/details/39228001First, syntax and rationale for update statements1.GrammarSingle tableUPDATEtable name set column name = new value WHERE column name = value such as:

Issue background Applicable situation: Operating system: Redhat 6.5Database: Oracle 11g R2Problem Description: The primary repository cannot be recovered and started or loses the main failover after the Advantages

Oracle A Chinese character occupies several bytes, depending on the character set encoding in OracleView the Oracle server-side character setSelect Userenv (' language ') from dual;If shown below, a Chinese character occupies two bytesSimplified

Creation and deletion of Oracle databases CREATE DATABASE statement 2011-08-28 16:42:48Category: OracleFirst, the conceptAn Oracle database, the most basic composition (logic): (1) system table Space 1--# for storage of "Data dictionary" (2)

Manual hot Standby (open library status)Backup control Files:ALTER DATABASE backup Controlfile to '/U01/ORADATA/PROD/CON.BAK1 ';Back up the data file (use PL/SQL for batch processing, paste the query results to run)BeginFor I in (select

One, sys users and system usersThe Oracle installation automatically generates SYS users and system users(1), sys user is superuser, has the highest privileges, has the SYSDBA role, has the rights to create database, the user's default password is

Take the training of Oracle recently, and make a study summary here.1, Oracle Database tuning can not only expect to modify a few database parameters to have a clear effect, the problem is more in the application, educating developers to correctly

Oracle Notes (13) Views, synonyms, indexesFirst, the ViewIn all the SQL syntax previously studied, the query operation is the most troublesome, if the program developers will be a lot of energy wasted on the query writing, it will certainly affect

Emmmmmmm This is actually the second half of November 4After the test with a bad mood to greet the afternoon customer simulation (second)This time, it's our dear King boss, yes.Boss Wang wants to find us to do a monster upgrade-based large-scale RPG

Oracle is the first word of Oracle unearthed in Yin ruins, so it is called Oracle in China, founded in 1977 and headquartered in California, USA.After installation, there are two main services that need to be turned on:1, instance service,

1. Mybatis jdbctype with Oracle, MySQL data type corresponding list Mybatis Jdbctype Oracle MYSQL Jdbctype ARRAY Jdbctype BIGINT BIGINT

1. Log transfer ModeThere are two types of log transfers (arc and LGWR), the first of which is to use the ARC process to transfer the log, as follows:Note: from "Big Talk Oracle RAC"The approximate process is as follows:1) Main Library: The log is

The purpose of this test is to export the Rman backup from the production database and then restore it in the test database1, copy Backup to the appropriate directory2, enter RmanRman target \3. Close the databaseShutdown4, start the database in

Oracle Dataguard Normal switchover and emergency switchingOracle Dataguard offers offsite disaster recovery solutions that can effectively prevent single points of failure and provide highly available technology, which describes dataguard normal

Oracle in expression parameters support up to 1000 maximumThe method is split into multiple col in ... or col in ...#region solve problems greater than 1000 private string getsubquery (string riskids) {int strparalen = riskids.length; String SUBQ =

Recently implemented a project to use a domestic dual-machine hot-standby products, but in the database to do two-machine hot standby There are some problems, there is no way. Have to study it! After two days of research finally the problem was

When 11241_bbed2.txt,11242.txt 201710000112420.bbed's use question 2.txt-- // Bbed is a good tool for exploring oracle data blocks. Sometimes it can directly view the internal structure of oracle internal blocks without dumping.-- // Pay attention

Solution to Oracle user password expiration and user lock, oracle user password Follow these steps: 1. Check the user's proifle, which is generally default: SQL> SELECT username, PROFILE FROM dba_users; 2. view the password validity period

Explain the Oracle function sys_connect_by_path, Oracle function sys_connect_by_path Syntax:Oracle function: sys_connect_by_path is mainly used for tree query (hierarchical query) and Multi-column forwarding. The syntax is generally:Select...