multi tenant database design example

within the database partition, isolation and management, for the application only need to connect to the database, do not need to set up a corresponding data background for each application. 3. Storing Data structuresFor the requirements of multi-mode database, the storage data structure of distributed

instead of a column. The overall design is as follows: CREATE TABLEQuestion (QuestionIDintPK, Questionbody Bodynvarchar( -) ) CREATE TABLEAnswer (AnsweridintPK, Answerbodynvarchar( -), QuestionIDint, FOREIGN KEY(QuestionID)REFERENCESQuestion (QuestionID)) For the above design, how many answers are no problem, and the addition and deletion of the search and change are simple more than a grade. Actual

This article is the PHP design pattern in a single case and a number of design patterns in the application of a detailed analysis of the introduction, the need for friends to refer to the The single example (Singleton) pattern and the Uncommon Multiple (Multiton) pattern control the number of classes in the application. such as the pattern name, a singleton can

) { $instance =new singletonexample (); } return $instance; } } $obj 1=singletonexample::getinstance (); $obj 2=singletonexample::getinstance (); Var_dump ($obj 1=== $obj 2);//True is the same instance ?> Multiton is similar to singleton, but the latter requires the getinstance () function to pass the key values. For a given key value there will only be a unique object instance, if there are multiple nodes, each node has a unique identifier, and each node in a single execution (such as the node

automatically provided by the program.In multi-layer Client/Server Applications, different security modes may be used at the same time. For example, the access middle layer can be controlled by using CORBA or MTS, and the middle layer can be used to process the details of logon to a remote database.1.1.3 transactionsA transaction is actually a group of actions t

MYSQL database design and database design example (I) preparations before bitsCN.com database design and database

Summary: For database design, we generally start from the conceptual model. In the conceptual model design phase, we focus on analyzing the logical structure of data to avoid getting into the specific storage details, all designs are irrelevant to specific database products to be used in the future. This article is sui

MYSQL database design and database design example (2) bitsCN.com database design-requirement analysis 1> The main task or function of requirement analysis is to investigate in detail t

Recently doing a simple quiz on the website The following four elements are now available person, topic, question, answer How to design a database (MySQL) People can focus on people, topics, problems Problems can have multiple topic tags The Feed Stream (Home page display) can be mixed to appear: The topic of my concern new issues New answers to the questions I care about Questions raised by people

I am currently working on a simple Q A website with the following four elements: Topics, questions, and answers to questions about how to design a database (MySQL, you can have multiple topic tags to feed the stream (displayed on the homepage). The following is a question added to my topic... recently, I am working on a simple Q A website. The following four elements are available: People, topics, quest

Label:To build a Web rights configuration system, you need the following five data tables: People table, grouping table, page table, table of contents, Operation permission table. The IDs used in each data table are the identity of the self-increment 1, and each data table is defined as follows:1.1 Personnel table (Operatorinfo)1.2 Grouping table (Operatorgroup)1.3 Page Table (PageInfo)1.4 Table of Contents (catalog)1.5 Permissions table (rightlist)1.6 Mapping relationshipsUser tables can be map

/* XCode LLVM XXX - Preprocessing中Debug会添加 DEBUG=1 标志 */#ifdef DEBUG#define NSLog(FORMAT, ...) fprintf(stderr,"%s:%d\t%s\n",[[[NSString stringWithUTF8String:__FILE__] lastPathComponent] UTF8String], __LINE__, [[NSString stringWithFormat:FORMAT, ##__VA_ARGS__] UTF8String]);#else#define NSLog(FORMAT, ...) nil#endifPaste the above code into the projectname-prefix.pch file.When debugging, the output (format: File name: line number) of the log.When the release is released, the log output is turned of

Connect to the simple and multi-threaded series 4, The creation and destruction of thread objects is a need to spend system resources, through the thread pool, can avoid this problem and improve the system response time. This situation is similar to the database connection pool we often refer to. The wide application of thread pools has enabled the support of the thread pool in the Sun's Toolkit in JDK 1.

Article tags design method, article tags database design method examples The following we take WordPress and Sablog as an example, said that WordPress and Sablog in the tag database structure design and procedures of the differenc