commit

One, what is a distributed database The Distributed Database System (ddbs:distributed) is developed on the basis of centralized database system. is a combination of database technology and network technology products. There are two kinds of

In China's reputation "big" online business transaction website "Dangdang" recently successfully listed on the other side of the ocean, from selling books, selling dishes to sell department stores ten years along the way, the Internet elder brother

server| Data | database Lock is a very important concept in network database, it is mainly used to guarantee database integrality and consistency under multi-user environment. The basic theory of lock used in various large databases is consistent,

public static function Exec_sql_tran ($arr _sql) { $result =true; $con = new mysqli (dbhost,db_user,db_passwd,db_name); $con->autocommit (FALSE); foreach ($arr _sql as $key => $sql) { if (! $con->query ($sql)) { echo $con->error. " /";

Start from a problem Recently, the bank of this matter more serious ah, many depositors of the money in the bank, it disappeared, and the bank does not ask, said the user's responsibility, litigation, users can also lose, this is "socialism." Let's

For the dbms_random described in the previous article. In the case of the value function, it is obvious that the call to the function occurred during the execution of the SQL statement. However, if you look at the processing of constants in SQL

DBMS_STREAMS_ADM provides three procedures for creating a table space-level replication environment: Maintain_simple_tts: Replication of a single table space Maintain_tts: Replication of multiple table spaces Pre_instantiation_setup and

Example Description: (1) Create 2 table spaces first. Create tablespace user01 datafile ' +dg1 ' size 1M; Create tablespace user02 datafile ' +dg1 ' size 1M; (2) Create a table on each table space. CREATE TABLE Scott.customers (cust_id

1, select the most applicable field properties MySQL can support a large amount of data access, but generally speaking, the smaller the table in the database, the faster the query executed on it. Therefore, in order to achieve better performance

Js In any web-based application, the program logic requires the user to submit information that needs to be validated, and the creator of the application can detect the data in two ways. The first approach is to validate on the client, even before

asp.net| Transaction Processing Three kinds of transaction processingTransaction processing is often encountered in the processing of problems, often used methods have the following 3 kinds of summary collation as follows:Method 1: Write directly to

SVN installation The SVN server operates in 2 ways: Standalone servers and Apache. Svnserve is lightweight and simpler than Apache, and Svnserve is included in subversion, so as long as subversion is installed it's equivalent to installing a small

Copying data from one table to another, inserting new data, or replacing old data is a problem that every Oracle DBA will frequently encounter. In the years before the oracle9i, we have to find out whether there is old data, if useful update

From the composition of the SGA of Oracle, it is highly recommended to use parameter bindings. Using parameter bindings makes it possible to use the share Pool efficiently, which can significantly improve performance by not having to harden the

The old man will not see HA, I also use this problem today, in addition to users, often appear accidentally press the return health of the data submitted, and then wrote a little bit of something to solve the You can also move the set point to the

Use PHP to complete SVN operations, including copying, viewing lists, deleting, moving, creating catalogs, viewing diff, updating, merging, submitting, getting status, getting commit log, getting the current version number operation. Test passed in

Using bbed not only retrieves data that has been delete, but also restores the update data, which is more complicated than restoring the delete data. The experimental process is as follows: Sys@orcl>create table Bbed_test (x int,y varchar2 (20));

This article mainly introduces the detailed interpretation of angularjs in the form of validation programming, Angularjs is a very popular JavaScript library, need friends can refer to the Demand Name must be filled in Username not required,

oracle| Tips Author: Liu Yingbo Collection and finishing Time: April 29, 2004 Reprint please indicate the source, thank you! 1. Find Useless index: DML performance is low, one of the most serious reasons is the existence of useless indexes. All

One, the spy of the binding variable (PEEK) 1, Oracle in the processing of SQL with binding variables, only in hard parsing will "pry" the value of the binding variable in SQL, and then based on the value of the detected to determine the entire SQL