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Reprint: http://www.itpub.net/thread-689020-1-1.htmlAn Oracle data dictionary is a database object that consists of tables and views that store information about the structure of the database. A database dictionary describes how the actual
Oracle's data dictionary is one of the most important components of the database tutorial, which arises as the database is generated and changes as the database changes, Some tables and views are reflected under the SYS user. The data dictionary name is an uppercase English
, Java files, and so on.Select object_name from User_objects;--mainly describes the current user's information, including the current user name, account ID, account status, table space name, creation time, and so on.SELECT * from User_users;-------------------------------------------------------------------------------------------------------------user_/all_ differences:The information listed----All_ is the object that the current user can access, not the current user-owned object.--Query all th
oracle| Data Author: anon Source: InterNet Add Time: 2003-7-20 The following table collects almost all the views or aliases in the Oracle data dictionary, and for each view or alias field, use the ' Describe ' statement to query. Name Description: In the
,autoextensiblefromdba_data_files wheretablespace_name= ' ZX1 '; file_name tablespace_name BYTES maxbytesaut--------------------------------------------------------- --------------------------------------------------------------------------------------------- -----------------------/opt/bboss/tst4/oracle/arch/zx1.dbf ZX1 1048576034359721984 yes--See open autogrow maxbytes defaults to 32G, that is, the dat
In the actual working environment, if you Truncate several data dictionary tables in the database during the operation, the database will no longer be available. In the actual working environment, if you Truncate several data dictionary
First, Oracle dictionary tables and views can be divided into three layers. 1.1 X $ table This table is the basis for running Oracle databases. It is dynamically created by Oracle Applications When the database is started. These sub-tab
1. Data Dictionary The Data Dictionary of Oracle Data is composed of base tables and data dictionary
4. Create oracle username tablespaces, tables, insert data, and user management tables in windows and Linux Log on to the super administrator and run the following command: Create databases, tablespaces, users, and insert data in Windows -- 01 crea
1. A data dictionary is a set of read-only system tables created and maintained by an Oracle server that stores information about databases and database objects. Data dictionaries fall into two main categories: base table and data
In the actual working environment, if you Truncate several data dictionary tables in the database during operation, the database will no longer be available, this article will give a detailed explanation of a related case. The example is as follows: Database environment: Oracle Database 9.2.0.7 RAC. (Note: the database
user_sequences ?Querying sequence information by user_sequences: SELECT Sequence_name,min_value,max_value, Increment_by,last_number From User_sequences; ?Last_number indicates that when NOCAHCE is not used, the next available value Synonyms DESCRIBE user_synonyms select* From User_synonyms; Add comments to a table ?To add a comment to a table or column using the comment statement:?Statement: Commenton TABLE Employees is ' Employee information '; commentcreated. ?Comments related to
The following articles mainly introduce the ODU recovery scenarios in Oracle databases. Because ODU has many practical application commands, especially the unload command, its actual application is very complex, the following articles briefly describe the command sequence used for data recovery using ODU in several scenarios. Scenario 1: The database cannot be started, but the
Data dictionaries in Oracle have static and dynamic points. The static data dictionary is not changed when the user accesses the data dictionary, but the Dynamic Data
The name of the Oracle data dictionary consists of a prefix and a suffix, using the _ connection, meaning the following:Dba_: Contains all object information for a DB instanceV$_: Dynamic view of the current instance, including views used by system management and system optimizationUser_: Recording user's object informationGV_: Dynamic view of all instances in a
First, Oracle dictionary tables and views can be divided into three layers. 1.1 X $ table This table is the basis for running Oracle databases. It is dynamically created by Oracle Applications When the database is started. These sub-t
Label:Data Dictionary-IntroductionThe name of the Oracle data dictionary consists of a prefix and a suffix, using the underscore "_" connection, which represents the following meanings:Dba_: Contains all object information for the DB instance.V$_: The dynamic view of the current instance, including the views used by sy
Data dictionaries and dynamic performance viewsData dictionary is an important part of Oracle database, which improves some system information of database. (Static information)The dynamic performance view records the information after the routine is started. (Dynamic information)The data
lengthDBMS_METADATA.GET_DDL: Generating DDL information for database objectsDbms_random: Fast generation of random numbersInitialize: Initialize Dbms_random package, must provide random number seedSeed: Reset random number SeedRandom: Production of stochasticDbms_flashback: Activates or disables the flashback feature of the session, which is required for ordinary users to use authorizationEnable_at_time: Activating session Flashback in a time-based mannerEnable_at_system_change_number: Flashbac
One, the Oracle data dictionary is composed of the following views mainly:1The user view is prefixed with user_ and is used to record information about the users object2The . All view is prefixed with All_ to record information about the user object and the object information that is authorized to access it3The . DBA view is prefixed with Dba_ to record informati
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