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A well-designed, performance-capable database engine can easily serve thousands of users at the same time. And the "weak" database system with more users to access the system will greatly reduce its performance. In the worst case, it could even

oracle| Object | data | database Topic: This article describes how to automatically obtain objects such as the most commonly used processes and packages in a shared pool when the database is started. Text: The following examples to demonstrate the

Recovery With a dbms_flashback bag. The Dbms_flashback package provides the following functions: Enable_at_time: Sets the flashback query time for the current session Enable_at_system_change_number: Set the Flashback query SCN for the current

Problem Original link: Http://www.eygle.com/special/NLS_CHARACTER_SET_06.htm The original published in the Itpub Technology series "Oracle Database DBA topic Technology Pristine", without permission, is prohibited reproduced this

If the required archive is lost during recover datafile, the recover cannot be made, and the bbed tool can skip the lost archive for recover datafile. The experimental process is as follows: Sys@orcl>select * from V$version; BANNER --------------

There are several ways:1 Add this code to the Head section on your form page:2Generate a token to save in the user session, add a hidden field to the form and display the orderThe value of the card, the form is submitted to regenerate a new token,

How to be in. NET to implement the transaction mechanism? There are usually 2 ways to write directly to SQL, using Ado.net implementations. Here is a brief introduction: Method 1: Write directly to SQL Using BEGIN TRANS, COMMIT TRANS, ROLLBACK

For DML statements, as long as the data block is modified, the Oracle database retains the modified data in the undo segment, while the undo segment is saved in the Undo table space. From Oracle 9i, there are two ways to manage undo: Automatic Undo

The first step: EXP original US7ASCII database Scott user. Step Two: EXP original US7ASCII database of Zhaoboyi users. Step three: CREATE NEW DATABASE (CHARACTER SET simplified Chinese_china. ZHS16GBK), All the paths with the original The database

On the itpub, I saw someone raise the question. In SQL Server or some other database, DDL statements can be rolled back, so why can't oracle rollback DDL statements? To illustrate this issue, first you need to explain what a DDL statement is. A DDL

This article mainly introduces Python fabric using notes, fabric is a remote operation and deployment of powerful tools, this article gives a number of examples of its use, the need for friends can refer to the Fabric Title is the development, but

I often complain that jquery's Dom does not perform well and often tries to optimize it in a number of ways, but the more optimized it is, the more frustrated it is to discover that jquery is actually doing well and that the optimizations that can

In order to access an ODBC data source, the application should include the following steps:1. Connecting to an ODBC data sourceRequires a given ODBC data source name and some other necessary information.Before an application calls an ODBC function,

These days to do transaction recover test, found a difficult to understand the problem. The specific problem scenario is as follows: 1: A standby client program that calls Usertransaction.begin () and then operates in sequence two XA resource, two

create or replace procedure SYSRINGALL_TEST isall_tmp_name char(30);all_name char(30);beginif all_tmp_name is null thenselect 'ring_all_old_'||to_char(sysdate,'yyyymm')||'_tmp' into all_tmp_name from dual;end if;if all_name is null thenselect

Global declarative Temporary tables Temporary tables are often used to store temporary data and intermediate results. Because they do not require logging and are not present in the system catalog, they can improve performance. In addition, because

Some of the most commonly used SQL statement syntax for the triple compilation. Need a friend to come over to refer to the next I. Data Control statement (DML) section 1.INSERT (Insert the statement into the data sheet) INSERT into table name

oracle| Data | database | Cursor SQL is the language used to access the Oracle database, Pl/sql expands and strengthens the functionality of SQL, while introducing stronger program logic. Pl/sql supports DML commands and SQL transaction control

or the test environment in the previous article: sql> CREATE TABLE T1 2 (ID number, NAME VARCHAR2 (30)); Table created. Sql> INSERT into T1 2 SELECT rownum, Tname 3 from TAB; Created rows. sql> CREATE TABLE T2 2 (ID number, NAME VARCHAR2 (30

SVN is also a directory synchronization we can use it to do version control, below to see about the Linux SVN submission ignores some files, directories (ignore attributes), I hope the example will help you. In the project, some files are not