data dictionary tables in oracle

Starting with 10.2, ORACLE added a new access driver for the external table: Oracle_datapump. And again before, there is only one default driver Oracle_loader.One advantage of using the Oracle_datapump driver is that external tables can be used to unload data from a database into a disk file that is not available in 10.1 and previous versions.Here's a simple exam

ORACLE queries one data table and then inserts two of the other tables by traversingGrammarThe first type:By using the Oracle statement block-- Specifies that all departments of the document can view DECLARE cursor table_dept isfrom g_users where Utype=2 and Status>-1 ; Begin for C in Table_dept loop INSERT in

Tags: advance user http Style description DMP file upd CREATE database LinNote in advance: This is the default Oracle has been installed to cut the database default tablespace has been created well. The data table DMP file is then imported directly into the default tablespace (the default tablespace is no longer specified because the default tablespace was specified when the database was created )The Linux

One, ALTER TABLE name modify field type (word length);If not, use the second method:Two--Create tablecreate table TABLE1 ( col1 Number (9), col2 char (20));//attempt to modify ALTER TABLE TABLE1 MODIFY COL1 Number (10 ); --Modification succeeds because there is no data in the table//INSERT data INSERT INTO TABLE1 (COL1, COL2) VALUES (1, ' AAA ');//try again to modify alter TABLE TABLE1 MODIFY COL2 VARCHAR

Label: Log in to the database you need to back up using PL/SQL developer; Select Tools, export user objects; Select the object in the object list that needs to be backed up, then select an output file of SQL type, click "Export", this is just the export data structure; Select tools, export tables; Select the table in the list where you want to export the

Label:Oracle restores data from a table to a point in time OraclesqlExecute the following SQL to restore data from the Test_temp table to 2011 04 29 11:06:00Note that it is important to delete all data first, otherwise it may result in duplication of dataDelete from Test_temp; INSERT INTO Test_temp SELECT * from test_temp as of timestamp to_timestamp (' 20110429

) {This.age = age;}}4, StuservicePackage sql2excel;Import Java.io.File;Import java.sql.Connection;Import java.sql.PreparedStatement;Import Java.sql.ResultSet;Import java.sql.SQLException;Import java.util.ArrayList;Import java.util.List;Import JXL. Sheet;Import JXL. Workbook;/*** @author Liuhaijun**/public class Stuservice {/*** @return*/public static listlisttry {Connection conn = null;conn = Dbutil.getconnection ();Create precompiled statement objects, usually with this instead of statementPrep

Differences between temporary tables in Oracle and temporary tables in SQL Server compared with the process of creating temporary tables in Oracle databases and the differences between temporary tables in SQL Server are the main c

PL/SQL-related data dictionary and plsql-related dictionary Data Dictionary related to PL/SQLHttp://www.oracle.com/technetwork/issue-archive/2012/12-nov/o62plsql-1851968.html Sometimes, we encounter the following problems during PL/SQL development:1) What database objects d

Differences between Oracle temporary tables and SQL Server temporary tables: The process of creating a temporary table in the Oracle database and the difference between the temporary table and the SQL Server are described in this article, next, let's take a look at this part of content, hoping to help you. 1. Introduct

Tags: header extension Source code create element type build Table Grant technology shareA data dictionary is a collection of metadata, such as created tables, columns, constraints, triggers, and so on, which are metadata that need to be saved in the database. In addition, some of Oracle's own database objects, such as directories, PL/SQL code, and so on, are met

[Oracle11g, 8] data dictionary and Character Set, oracle11g Character SetI. Data Dictionary: oracle's data dictionary records the metadata of database management. It is a core file of life and death for databases. 1. Place the

Temporary tables, external tables, and partition tables in OracleTemporary table In Oracle, a temporary table is "static". It only needs to be created once like a common data table. Its structure is valid from creation to deletion. Compared with other types of

EXP Export Oracle database table: (as native administrator), refer tohttp://jiqinlin.iteye.com/blog/758469 Export TABLE: Exp username/password @localhost (IP address): Port number/Database instance name file= local address \ Want to generate an indication. DMP owner= (username, Password) eg:exp C # #tjuser/TJUSER@LOCALHOST:1521/ORCL file=c:\adc160624.dmp owner= (C # #tjuser, Tjuser)//tables under the curren

The data dictionaryThe most important part of the Oracle database is the data dictionary.The data dictionary is a set of tables and views that hold the database's metadataInformation. You cannot update the

A. Data dictionary:Oracle's data dictionary records the metadata of database management, which is the core file of life and death for a database. 1. The data dictionary is placed in the system table space, and the user is sys. 2. Describe the definition of databases and obje

1. Introduction 在InnoDB启动时，如果是新建数据库则需初始化库，需要创建字典管理的相关信息。函数innobase_start_or_create_for_mysql调用dict_create完成此功能。即创建数据字典，因为InnoDB系统表的个数结构固定，所以初始化库的时候只需要创建这几个表的B+树即可并将B+树的根页号存放到固定位置。对于B+树，只要找到根页面，就可以从根页面开始检索数据。相关系统表（即上一节讲到的4个系统表）在InnoDB内部，不会暴露给用户。 4个系统表通过固定的硬编码进行构建。具体原理流程如下。2. Data dictionary creation and loading principle flow3. Description1) The Innobase_start_or_create_for_mysql function calls the Dic

Data Dictionary and dynamic performance View Introduction: What is a data dictionary? Data dictionary is the most important component of Oracle databases. It provides some system inform

Link: Ultraviolet A 1385-billing tables Given n phone prefixes, each prefix is the prefix of a region. Now a new phone bill is generated, that is, for each phone number, the old phone bill is traversed from the front to the back, if the prefix matches, the phone number corresponds to the current zone number, and the new phone number must be as small as possible. Solution: Use DFS to create a dictionary tree

Oracle cluster and cluster tables, Oracle cluster tables Oracle clusters and cluster tables A cluster consists of multiple tables that share the same