Oracle

One: Why you need to use database designDatabase design enables the database to work efficiently and healthily through a robust database structure.two. Database design principles ( database design, system design, architecture design)1. Familiarity

found that Oracle supports regular expressions. First collection.There are four main functions in Oracle that support regular expressions:1,regexp_like: Similar to the function of like2,REGEXP_INSTR: Similar to the function of INSTR3,REGEXP_SUBSTR:

Oracle has been used for a long time, but it is generally used or executed under PL/SQL developer. Previously used related scripts are used by Awrrpt.sql to generate AWR reports. Recently there is an idea to write a SQL script placed in the user

1. Turn off all Oracle services. Can be turned off in the Windows Service Manager;2. Open the registry: Regedit Open path: hkey_local_machine\system\currentcontrolset\services\ Delete all service names starting with Oracle under this path, This key

First, the database conceptDB databaseDBS Database SystemDBA Database Administrator AdministratorDBMS Database Management SystemSecond, the relational databaseOracle oracle,ibm db2,ms sqlserver,sybase sybase,ibm informix,mysql,accessXml,txt can do

First, uninstall Oracle before oracle11g there is a situation where uninstalling is not clean, causing the installation to fail again, running services.msc to open the service, stop all services of Oracle.Second, oracle11g with a uninstall batch

In Oracle, you can create composite indexes, which are indexes that contain two or more columns at one time. In terms of the use of composite indexes, Oracle has the following features:1. When a rule-based optimizer (RBO) is used, the index is used

The project uses:First of all: The Flash back method has a premise, is the need to identify problems early, decisive action. If the record of the misoperation has been cleared in the Undo table space, this method is not available and needs to be

/* Create a procedure, Oracle pl/sql syntax */create or replace procedure myprocas   v_id      t_user.id%type; /* declares a variable, and the type is consistent with the specified table field */   v_user    t_user%rowtype; /* declares a variable

installation and download of 1.oracle1.1 Oracle Services:Oracle Monitoring Service (Oracleoradb11g_home1tnslistener): When a database needs to be accessed through a program, it must be opened.Oracle Instance Service (Oracleservice): In an Oracle

Sometimes we need to query specific field information in Oracle by field name, field type, field length, field comment, table name. For example: Yesterday, my colleague asked me, our database has been useful in the BLOB type? I can't remember a

Configure OEM Environment variablesOracle_unqname= $ORACLE _sidTo open the OEM Web management program, you must first start database listener, and then start the Datebase control port monitor, but you encounter the following situationProblem:[Email

Oracle Study--DBCA Build library errorSystem environment:Operating system: RedHat EL54Oracle:oracle 11gR2Failure phenomena:After installing the 11GR2 software ready to create the database through DBCA, execute DBCA with the following error:[Email

Oracle database We are all familiar with the fact that there is a very common data type in the database: string type.For the supposed type, there are three more commonly used types in Oracle: VARCHAR2 (Byte), varchar2 (char), NVARCHAR2 ().So what's

#!/bin/sh# Get HostnameHostname= ' HOSTNAME 'Logfile=xunjian_ ' Date +%y%m%d '. LogHostinfodir=/home/oracle/xunjianif [[!-D $hostinfodir]]ThenMkdir-p $hostinfodirFiDate >> $hostinfodir/$logfileecho "hostname" >> $hostinfodir/$logfileHostname >>

Oracle11g manual database creation method, oracle11g Database How to manually create a database at Oracle11g Reference Web http://www.th7.cn/db/Oracle/201311/36926.shtml Installation path My installation path is: E: \ app \ admin \ product \ 11.2.0 \

Oracle query fields by Field Type Sometimes we need to query specific field information in oracle through the field name, field type, field length, field comment, table name. For example, my colleague asked me yesterday if blob type is used in our

Solution after the dbf File of Oracle is deleted by mistake, oracledbf Problem description: If you accidentally delete the dbf file of the Oracle database, an error is prompted when you start or close the database. When startup starts the database,

ORA-02049: Timeout: Distributed Transaction Processing wait lock Simulation I want to simulate this error and see what the problem is. Create a table on Database B: create table TEST(A NUMBER,B DATE);insert into test (A, B) values (2, to_date('16-04-

Two Connection Methods for Oracle Database ServerOracle provides two Database Connection Methods: Private connection and shared connection. The difference is that the private connection mode is that a user corresponds to a database server process,