Oracle

In this Document Purpose Scope Details What does "split brain" mean? Why are this a problem?

JDBC is a technology developed by Sun to connect databases in the Java language.First, the basic knowledge of JDBCJDBC (Java Data Base Connectivity,java database connection) is a Java API for executing SQL statements that provides unified access to

[Email protected] hub]$ cat/etc/oratab# # This file was used by ORACLE utilities. It is created by root.sh# and updated by either database Configuration Assistant while creating# a database or ASM Configu Ration Assistant while creating ASM

Comparison operator:> greater than,>= greater than or equal, = equals,!=,<>,^= not equal toPrecedence of logical operator operations: not > and > OR ( parentheses can be used if you want to change the order of precedence )Special operators:[NOT]

1. Caused by:java.sql.SQLException: Invalid column indexReference: http://bbs.csdn.net/topics/300179772The configured SQL statement was incorrectly written select distinct ' After using #{**}, no more single quotes are added. Corrected toSelect

1.USEREVN ()To return information about the current user environment, opt can be:Entryid,sessionid,terminal,isdba,lable,language,client_info,lang,vsize1.ISDBA See if the current user is a DBA if yes returns trueSql> Select Userenv (' Isdba ') from

Reprint: http://www.cnblogs.com/kerrycode/p/4034231.htmlIn the Oracle database, sometimes the ALTER SYSTEM kill session ' sid,serial# ' is used to kill a session process, but after the session is killed with this SQL statement, the database does not

It is important to master a knowledge point:In Aix operating system (only Aix has this problem, other OS does not have this problem), if this AIX small machine is used as NFS client, and this small machine is also Oracle database server, and on this

Article reference: http://blog.csdn.net/caomiao2006/article/details/11901123 thank Bo friends to share O (∩_∩) o~Install Oracle remote client (typically local if available, install Oracle and install client)1. To use Oracle remotely, download the

After work, have been busy with the front-end development; Basically forget, all of Oracle's things; think back to the original "DBA" dream; Consider the present situation, long story, filled with emotion; In order to pick up the knowledge of the

Clob and BLOB fields in Oracle have been developed to meet the requirements of storing oversized content, but in some simple uses it often brings trouble. A pointer is stored in the CLOB and cannot be taken directly to the actual value. and the Text

1 Oracle database mainly consists of data file database and DB instance instance. Users are linked to the server process through user processes. When the database is started, you need to rely on the parameter files parameter file, if our database is

1. Background:A project of the company to expand Service, add a short message service platform, the implementation of the Platform in accordance with predefined rules to users to actively send SMS and user-demand, two ways. SMS platform needs to be

Linux installation Oracle JDK replacement OPENJDK detailedYang Posted in:2013-3-11 Category:LinuxAs is known to all, due to the copyright issues of Oracle's JDK, most Linux distributions are installed with an open source openjdk with no copyright

Oracle provides analytic functions starting from 8.1.6, which are used to calculate some sort of aggregate value based on a group, which differs from aggregate functions in that multiple rows are returned for each group, whereas aggregate functions

Plsqldeveloper Configuration Guide for Oracle-free clientsThe first step:Download instantclient-basic-win32-10.2.0.5.zip to this machine from Oracle website, then unzip and create a new Oracle in the C packing Directory folder, copy all the

I. Export data using a data Pump 1.1. Determine the character set:SELECT * from V$nls_parameters;OrSelect Userenv (' language ') from dual;1.2. Setting up the client character set (Windows)Set Nls_lang = Nls_language_nls_territory. Nls_characterset1.

Step by step, gathering small streams ------ quickly add test data to oracle Some time ago, problems were found during implementation and need to be modified at that time. Because the data in the database is real data, it cannot be modified.

Subquery 1 (subquery in WHERE), where in subquerySubquery A subquery is a compilation of complex queries by embedding several small queries with different functions in a complete query statement, to help readers better understand the concept of

Explore Oracle Database Upgrade 9 12.1.0.1Update12.1.0.2 I. Check the current database version and system information [oracle@db01 ~]$ lsb_release -aLSB Version: