data dictionary tables in oracle

process, we found that tables in the read-only tablespace can be dropped. Why?As mentioned above, each database will have an ONLINE tablespace during operation. The tablespace name is SYSTEM, and the data dictionary is saved in the SYSTEM tablespace, and database objects such as stored procedures, triggers, functions, and packages in PLSQL. When you delete a dat

First, you must understand that the physical structure of the database is determined by the operating system files of the database. Each Oracle database consists of three types of files: data files, log files, and control files. Database files provide real physical storage for database information. Each Oracle database has one or more physical

table, add this conditionORDER BY A.id,a.colorder The second company uses MySQL5.6, which is simple to generate a data dictionary: USE information_schema; select t . Table_schema as , t . table_name as , t . Table_type as , t . engine as , c . Ordinal_position as , c . column_name as , c . Column_type as , c . is_nullable as , c . Column_key as , c . EXTRA as , c . Character_s

1. Enterprise Manager has two forms: Database Control and grid control. Database control is used to manage a single database, and grid control is used to manage multiple databases. Database Control is generally configured by dbca during database installation. Both are web managers, but can be used only with appropriate licenses. 2. SQL developer SQL developer is a tool used by software developers to view database objects such as table structures and execute query plans. 3. RDA (Rem

stores two or more tables in a single unit cluster 3. Under what circumstances is a clustered table used? Single-table clustering solves large scale data processing in massive database. The composite clustering greatly improves the efficiency of the specific table connection. Clustering plays a great role in improving the efficiency of data reading, but the

Data dictionary generation tools (7): NVelocity code generator and generation tool nvelocity This system has not been updated for a long time, and people are also getting lazy. From now on, at least three articles are written every month. You are welcome to supervise it. By the way, we will announce that this series will bring you a series of WebApp development articles, so stay tuned. First, let's take a

This article explains the design of dictionaries commonly used in general database systems: Dictionary table (Dictionary) Field name Type Description Number Char (16) Discontinuous increments (not NULL,PK) Category name Varchar (64) Use to filter select Dictionary table related fields Content

/* New and Old database data dictionary comparison script */ -- Note 1: the New and Old databases must be in the same database server and instance. It is best to log in as SA.-- Note 2: This script can be used for system upgrade and transformation and data migration after relevant information is obtained. Declare @ I int Set @ I = 4/* indicate as the

The following articles mainly describe the practical experience of using temporary Oracle tables correctly. The proportion of temporary Oracle tables in practice is still the majority. If you use this technology, if you are curious, the following articles will unveil its mysteries. 1. Preface Currently, all application

Tags: char cells SQL set OCA while header INF imagesUsually do development, look at the MySQL table is used navicat, although it is convenient to view the individual table fields, but to see the entire database of the individual fields of the details of the table is not so convenient, so I found a piece of code on the Internet, the database all the table fields are displayed, This will make the view structure clearer. Show effect 1PHP2 /** 3 * Generate MySQL

unsuccessful;(2) The version of PowerDesigner and Pdmreader software should correspond. As a result of my testing, the latest version of Pdmreader is supported only to PowerDesigner version 12.5, and the exported *.PDM file for 15 is not supported.Of course, if you do not notice the author of these Pdmreader software will also give you a very thoughtful hint, also will give you PowerDesigner 12 version of the download link;(3) Use PowerDesigner export *.PDM have a select the database and select

Label: PHP$dbserver= "localhost"; $dbusername= "Root"; $dbpassword= "Root"; $title= ' Data dictionary '; if(!isset($_get[' DB '])){ $database= "MyDB"; }Else{ $database=$_get[' DB ']; } $mysql _conn= @mysql_connect("{$dbserver}","{$dbusername}","{$dbpassword} ") or die("Mysql Connect is error.")); mysql_select_db($database,$mysql _conn); $result=mysql_query(' Show

How to obtain MSSQLServerOracelAccess data dictionary information? what if you forget the name of a database or table, or the structure of a given table (for example, what is its column name? MySQL solves this problem by providing several statements about the database and its supported tables. 　　 You have seen show databases, which lists the DATABASES managed by

/* Ms SQL comparison script for new and old database data dictionaries */ -- Note 1: the New and Old databases must be in the same database server and instance. It is best to log in as SA.-- Note 2: This script can be used for system upgrade and transformation and data migration after relevant information is obtained.Declare @ I int Set @ I = 4/* indicate as the