Oracle

Open "my computer"-"Control Panel"-"Administrative Tools"-"Data Source ODBC"-"User DSN ", Step 1: click "add ". Step 2: Select "oracle in oradb10g_home2" Step 3: click the "finish" button and click the "finish" button. An error dialog box is

Copyright statement: You can reprint it at will, but the original author charlee and original link http://tech.idv2.com/2005/06/03/oracle-null-info/must be identified in a timely manner. The null value is not equal to 0 or null, indicating that the

When designing a database system, it is important to find out which type of application you are facing. Currently, popular application types include: * online transaction processing (OLTP = online transaction processing) Applications Program *

Set Operators Union/unionall ------------- Union The Union operator returns all records after two sets are removed from duplicated elements. Union all returns all records of two sets, including duplicateSelect * from EMP where deptno = 20 and job

First, two types must be defined. 1. Row Type create Or Replace Type ty_row_str_split As Object (strvalue Varchar2 ( 4000 )) 2. Table typeCreate Or Replace Type ty_tbl_str_split Is Table Of Ty_row_str_split Create Function Or Replace

Select enameFrom Scott. EMPStartWith ename = 'King'Connect by prior empno = Mgr;--The result is as follows:KingJonesScottAdamsFord SmithBlakeAllenWardMartinTurner JamesAnd:SelectSys_connect_by_path (ename, '>') "path"From Scott. EMPStartWith ename =

Http://www.iteye.com/topic/26431 Create a sequenceIntroduction to Oracle Sequence In Oracle, sequence is the so-called serial number, which is automatically increased every time it is obtained. It is generally used in places where the sequence

Http://wanwentao.blog.51cto.com/2406488/457604 Roles and permissionsRole permissions are used to grant permissions of a user to a role. Any permission can be granted to a role. You must use the with_admin_option clause to grant the system

Quickly browsed the official Oracle Web page and unofficial PPT, and briefly understood the high availability solution provided by Oracle. There are three main types:   1. RAC   RAC, real Application Clusters   Multiple Oracle servers form a shared

If data is written to the clob field as a string in Oracle, the default length is 4000, and the maximum storage space is 4 GB. Writing a string directly to the clob field can contain a maximum of 4000 bytes. To write a large character data, you can

Oracle Database startup and shutdown Methods I. Several startup methods: 1. startup nomount Non-installation startup. In this mode, you can execute: re-build the control file and re-build the database. Start the instance, that is, start the SGA and

Enter sqlplus/nolog in cmdThen, enter Conn/As sysdba in the displayed interface.In this way, the user logged on to the local system is used as a trusted user to access the database.Alter user SYS identified by "123 ";In this way, you can change the

Common Oracle hint usage: 1./* + all_rows */It indicates that the overhead-based optimization method is selected for the statement block, and the optimal throughput is obtained to minimize the resource consumption.For example:Select/* + all + _ rows

========================================================== ============================= Nested table test ========================== ========================================================== = Author: tsmld (http://tsmld.itpub.net) Posted at: 2006.

The following database version is Oracle 9i (9.2.0). When the database is installed, the database system creates a database instance. The installation directory is/Oracle, enter the Database Name and database SID number ora9i. 1. parameter

The URI Method for connecting to the Oracle cluster by using thin in Java was recorded last time. I have not tested the method, but I found that the OCI (Oracle call interface) is more stable, and finally decided to use this method. Follow these

Requirement: the number of appointment cases on the current day is at the beginning --> the number of cases that have never been handled --> the last handling time is sorted from small to large (that is, the closer the collection is, the more the

1. What is Oracle Character SetThe Oracle character set is a collection of symbols for the interpretation of byte data. It can be divided into different sizes and have an inclusive relationship. Oracle supports the national language architecture,

I. we can improve the performance by configuring the Shared Pool to ensure that users find cached statements in the memory. Another important method is: this allows users to find the data they requested in the memory! This requires the database

When we optimized Oracle performance and checked the Shared Pool and buffer cache hit rates, we realized that we needed to increase these structures to improve them, however, the server does not have enough memory to support this improvement. At the