logical database design

Layer-5 logical Architecture DesignLogic: LogicalPhysical: PhysicalArchitecture: ArchitectureFramework: FrameworkPresentation Layer: PresentationUser Interface: User InterfaceBusiness Logic: Business LogicData AccessData and Storage Management: Data and Storage ManagementGraphical User Interface: Graphical User InterfaceFat Client: Richer Client-sideSmart Client: Smart ClientApplication: ApplicationServer control: Server-side controlEvent-drivenReusab

programming language.2.1 Overview of programmable logical devices FPGA is a programmable logic device. PLD was a new type of device developed in the 1970s S. Its application and development not only simplifies circuit design, reduces development costs, but also improves system reliability, it has brought revolutionary changes to the design method of digital syst

The logical standby database does not copy the database service. When switchover or failover is performed, the middle layer connecting to the master database service cannot be connected (because the creation of the service is not replicated ), or the version of the connection is incorrect (because the modification of t

Label:The SAP standard program was debugged with a logical database-related section, which, by the way, translated the official help file of ABAP as an exercise. Please correct me.Logical DatabaseA logical Database is a special development object that is edited in logical

Summary article: Http://www.cnblogs.com/dunitian/p/4822808.html#tsqlThe design of a system is not very reasonable, many libraries, graphical operation of the separation have to do half a day, a variety of renaming is also a waste of time, so the introduction of the command ~ (SQL Server is now running in Linux, we have to keep up with the Times)1. Before the database name is modifiedALTER

Original address: http://edacn.net/bbs/viewthread.php? Tid = 118442 extra = Highlight = page = 1The fourth part is hard to understand and has doubts (marked red). After the second clock cycle, reg1 should be 1. Introduction to logical design First of all, in the logic Design Medium OpenGL /V HDL Is the least important knowledge. If you want to use Lea

The logical standby database fails after the primary database replaces undotablespace in the oracle10gpaa environment. The logical standby database fails after the undo tablespace of the master database is changed in the Oracle 10

In the enterprise Application architecture pattern, three kinds of domain logical organization patterns are put forward: Transaction script, domain model and table module. Many people look at the foggy, many people say the indefinitely, the main reason is not from the project level of analysis and design experience, only a single project module development experience of people difficult to understand in pla

Use MyDBGo--1. Querying the logical file name of the current databaseSELECT file_name (1) as ' file name 1 ', file_name (2) as ' file name 2 ';--or query with the following statement:--select name from Sys.database_files/*File name 1 file name 2------------------- --------------------MyDB Mydb_log(1 rows affected)*/--2. Modifying the logical name of a data file or log fileALTER

1. Build a physical standby Database 2. Stop redo applications on the physical standby database. If the standby database is RAC, all instances other than the following statements must be stopped. SQL> alter database recover managed standby database cancel;

Logical backup and Recovery of database (table)--ExportSystem can export any scenario, for example:Exp System/[email Protected] Owner (System,scott) file=d:system.dmp;//Note: Two scenario system scenarios and Scott scenarios can be exportedexp System/[email Protected] Owner (Scott) file=d:system.dmp;//can only export the Scott scheme ( This is the use of the system to export the Scott scheme, Reason: System

Reference: http://blog.csdn.net/htl258/article/details/4106591,it is very useful. Use mydb go -- 1. query the logical File Name of the current database: Select file_name (1) as 'file name 1', file_name (2) as 'file name 2'; -- or query by the following statement: -- Select name from sys. database_files/* file name 1 file name 2 ------------------- -------------------- mydb mydb_log (1 row affected) */-- 2.

The LUA logical operator considers false and nil to be false, and the other is true. andand or The result of the operation is not true and false, but is related to its two operands.That is:A and B: If A is false, return a, otherwise return BA or B: If A is true, returns a, otherwise returns BThe lua three-mesh operator is A and B or C One problem here is that when B is nil, it returns the value of C. Copyright NOTICE: This article for Bo Master origi

1. Logical standby Master/Slave database Switch 1.1 check whether the master database can be switched SQL> select switchover_status from V $ database; Switchover_status -------------------- Sessions active 1.2 switch the master database to the

table Logical backup and recovery of databases (tables)-Database Import * ** 1. Import a table (M123 is the password of Scott, myoral is the database instance, the table to be imported is emp, and its backup is emp. dmp) ***2. Import Solution * ** 3. Import the database Oracle

DescriptionThe Logical standby database is converted through the physical standby database.This Logical standby is converted by physical standby, which was previously created.Physical standby construction can refer to the following links: http://www.cnblogs.com/zhenxing/p/5260693.htmlData types supported by logical DGB

----------- Step-by-step instructions for creating a logical standby database ----------- 1. Create a physical standby database (exsiting now) 2. Stop redo apply on the physical standby DatabaseExecuting the following statement in the sqlplus on the physical standby database:Alter database recover managed standby

2.1.1unlike other database products, Oracle has its own unique system architecture. The Oracle system architecture is the framework of the entire ORACLE Server System and the basis and core for managing and applying ORACLE data servers. The Oracle system architecture consists of three parts: logical structure, physical structure, and instance. The instance is the core of the physical and

does not need any changes.By using the up-to-turn type, we can program for abstraction, focus on the logic design of the program upfront, and then inherit the abstract class or interface from the subclass　　The implementation of specific functions, or sub-class can be written to other people to write, to achieve the effect of parallel development software, so as to improve the speed of software development, perhaps this is the team to develop software

In Oracle's Data Guard environment, the logical standby database application process stops and the log shows an error as ORA-01403 not data found. The specific information is as follows: Mon May 21 10:39:31 2012 LOGSTDBY status: ORA-01403: no data found LOGSTDBY Apply process P004 pid = 143 OS id = 13936 stopped Mon May 21 10:39:32 2012 Errors in file/u01/app/oracle/admin/db/bdump/rdb_lsp0_13922.trc: ORA-12