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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

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. " /";

ADO Disclaimer: This only makes a simple analysis of concurrency conflicts, so in front of the word "talk", I hope you can see the general treatment methods and attention to the matter, if there are any omissions, it is quite natural, after all, my

BFILE binary files, stored in an operating system file outside the database, read-only. Treat this file as binary. BLOB binary Large object. A large object stored in a database, usually a file such as an image sound. CLOB large-character object.

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

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

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

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

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

Third, the existing O/R mapping product introduction O/R mapping has been a long time, a lot of products: Java has hibernate, JDO and so on. Net has objectspaces, grove.net, Ojb.net, Atomsframework, Objectz.net, OPF. NET and so on. 1, Hibernate

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

Oracle First chapter: Log Management 1.forcing Log Switches sql> alter system switch logfile; 2.forcing checkpoints Sql> alter system checkpoint; 3.adding Online Redo Log groups sql> ALTER DATABASE Add logfile [Group 4] Sql> ('/disk3/log4a.rdo ',

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

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,

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));

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

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

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

Acronisdiskdirectorsuite is a powerful set of hard disk management tools that can be partitioned and used to repartition or tune existing hard disks without losing data, and to fix data in damaged or deleted partitions. In addition, the software is