what is use of materialized view in oracle

Vw_nso_1 is created dynamically when we view the execution plan. VM is the agreed prefix/Suffix of the Oracle view. When working with foreigners, we often see the suffix of VW, it indicates the view, which

Concept:Oracle statistical information: it is stored in the data dictionary and describes the object details in the Oracle database from multiple dimensions. CBO uses these statistics to calculate the cost of each path. Category:Statistical information of tables, indexes, columns, systems, data dictionaries, and internal objects Collect statistics:The analyze command and the dbms_stats package. You can

dictionaries, and internal objects Collect statistics:The ANALYZE command and the DBMS_STATS package. You can use tables, indexes, columns, and data dictionaries. System and internal objects can only use DBMS_STATS. 1. ANALYZE analyze table PROC_PROGRESS_LOG delete statistics; -- delete statistical information analyze table PROC_PROGRESS_LOG estimate statistics sample 15 percent for table; -- Estimation m

When operating the Oracle view through DML, a very important condition is that the base table to be operated must be a key-preserved table.So what is the key-preserved table? Oracle defines it:A table

Baidu know: Http://zhidao.baidu.com/link?url=B5MFOzDlww8soYqr5CL5FldH4sXD6eumS1XTRn8XEh8gu4mKjQdPkJSLIBt7u_ Xtf7jcrjrjegwiqcweq1z-nqThe UI interface for Android is made up of a combination of view and ViewGroup and their derived classes. where view is the base class for all UI components, ViewGroup

What is a foreign key A foreign key (FK) is one or more columns that are used to establish and strengthen a link between two table data. You can create a link between two tables by adding one or more columns that hold the primary key values in the table to another table. This column becomes the foreign key of the second table. Why foreign keys are used. Ensu

What is the purpose of the controller in MVC? what is the difference between it and the model? I just learned the MVC framework. What I cannot understand is that the controller. what I

! Let's take a closer look. The originally defined class name is exactly the same as the called function name. It's a conflict. No wonder !!! After modifying the class name, troubleshoot the error !!!!! OK !!!!!! Note that (1) After modifying the class name, you may need to change the name of the ". Java" file accordingly.(2) After the modification is complete, press Ctrl + Shift + O again t

What is the purpose of the controller in MVC? what is the difference between it and the model? I just learned the MVC framework. What I cannot understand is that the controller. what I

the request, also can send the request, use it to write the data on the network conveniently. 5. Q: Now the server and client want to establish a socket connection, server only know the client's IP, the port number does not know, can establish a connection? There's no code to look at.A: C and S are relative, the one on which the connection is initiated is C, and

Android UI Interface Architecture　　Each activity contains an PhoneWindow object that PhoneWindow is set DecorView to the root view of the application window. In the inside is familiar TitleView and ContentView , yes, usually use setContentView() is set ContentView .How does

Document directory Oracle listener Oracle management agent In Linux, you can run the ps command to view Oracle-related processes.Oracle listener This command will list the processes of Oracle Net Listener [Oracle @ bej3014

What is the Oracle database shutdown and startup command ?, Oracle commandsPreface Log on to sqlplus with sysdba and run the following command. On windows, the background processes that constitute instances in oracle are implemented by threads derived from the

What is MySQL view is a virtual table whose content is defined by the query. Like a real table, a view contains a series of columns and row data with names. However, a view does not exi

goal-the direction of the product. (so also please the product design of each link to promote full understanding of product direction, unified understanding of product value.) This is united) Question Five: Interaction Design 3.0 = Product Manager? Blueui: See the interactive product manager, see the product manager to interact. The view is no change, how to c

What is the view error in the DNS configuration file? -- Linux general technology-Linux technology and application information. for details, refer to the following section. When I configure the DNS service, named. the conf configuration is correct. it is configured according

Tags: sysman proc database Word instance release RAM Fail-oYou can use the PS command to view Oracle-related processes under LinuxOracle ListenerThis command lists the processes of the Oracle Net Listener [Email protected] www.linuxidc.com ~]$ Ps-ef | grep Tnslsnr Oracle