Oracle

Oracle| Stored Procedure | cursor in the Sqlplus to establish the following content: 1, Package sql> Create or Replace package types 2 as 3 type CursorType is REF CURSOR;  4 End; 5/ The package has been created. 2, function sql>

oracle| Data | database import Java.net.URL; Import java.sql.*; public class Javaoracle { Public Javaoracle () { } public static void Main (string[] args) { Try { try{ Class.forName ("Oracle.jdbc.driver.OracleDriver"); } catch

1. Define constraints when you build a table, either at the column level or at the table level. For a NOT NULL constraint, it can only be defined at the column level and cannot be defined at the table level. (1) Column-level definition Grammar:

One, undo tablespace and Rollback segment 1, the main role of the undo section (1) Transaction rollback (2) Transaction recovery (instance recovery, using rollback to recover uncommitted data) (3) Read consistency (construct CR) (4) Flash back

CREATE OR REPLACE FUNCTION fun_account_change (headobject in Ebsheadobject,           &NBS P                inaccountno in Pub_account_info. Accountno%type,                           INACC Ounttype in Pub_account_info. Accounttype%type,          

This article will combine the author's recent work, in the Oracle database paging query, encountered a small problem, for you to explain how to solve the Oracle paging query sorting and efficiency issues. The original paging query SQL code is as

The purpose of this article: 1. Say something about Oracle's optimizer and its related knowledge. 2, answer why sometimes a table of a field is clearly indexed, when the observation of some SQL execution plan, found that the problem does not go to

Use of index clusters: Create clusters of tables that are often accessed in connection statements. Do not cluster tables if the tables are only occasionally connected or their public columns are often modified. (It takes more time to modify the

In order to be successful, I'll involve some preliminary steps that will be needed to see what happens, including running Plustrce SQL scripts, creating a Explain_plan table, granting roles, configuring Sql*plus environments to view execution plans.

The new feature of ORACLE11G's automatic memory management (Automatic Memory Management) is another important enhancement of Oracle's memory management. If this parameter is set too high, the following error prompts may appear when the instance is

Is it difficult to accurately allocate the amount of memory required for different pools? The automatic shared memory management feature makes it possible to automatically allocate memory to where it is most needed. Whether you're an entry-level

Paging Query format: SELECT　*　FROM ( SELECT　A.*,　ROWNUM　RN FROM　(SELECT　*　FROM　TABLE_NAME)　A WHERE　ROWNUM　 ) WHERE　RN　>=　21 The most inner query select * FROM table_name represents the original query statement without paging. RowNum = 21 control

ACID, an abbreviation for the four basic elements that a database transaction performs correctly. Contains: atomicity (atomicity), consistency (consistency), isolation (isolation), persistence (durability). A support transaction (Transaction)

In a previous article that briefly describes how Java programs invoke the basic syntactic structure of Oracle stored procedures, this article introduces another Java-Oracle relationship, that is, writing Oracle stored procedures through Java.

This article discusses how to use ado.net to access Oracle stored procedures (called SQL programming Blocks) and functions (a programming block that returns a single value). You can connect to an Oracle database using the following managed data

The process of 3.5.1 server shutdown The system completes the following steps when you close the database routine. 1. The first phase Oracle writes the contents of the buffer to the redo log file. Writes the changed data in the database buffer to

To create a profile in Enterprise Manager (1) as shown in Figure 8.26. (2) The General Information tab of the Create profile as shown in Figure 8.27 appears. (3) Figure 8.28 shows the Password tab to create the profile. (4) The interface appears

What is a view A view is like a window in a datasheet, after an administrator defines the location of the windows, the user can only view the data that he can see. A view is not a datasheet, it is just a collection of SQL query statements that

oracle|web| pagination Import java.sql.*; Import java.util.*; Import weblogic.db.jdbc.*; public class Bandlistbean { Private String driver; Private String Dburl; Private Bean2 b=new Bean2 (); Public Bandlistbean () { Globalbean globalstr = new

What happens when SQL Server Oracle MySQL detects that a value is null in the database? 1, Mssql:isnull () Grammar ISNULL (Check_expression, Replacement_value) Parameters Check_expression An expression that will be checked for null.