Oracle

In Oracle, there are two optional parsing processes for a submitted SQL statement: Hard parsing and soft parsing. A hard parsing requires parsing, creating execution paths, optimizing access plans, and many other steps. hard explanation not only

The view prefixed with all in the data dictionary is available to all users, and the displayed information is specific to the permission range of the user who sends the query; the view with the prefix of DBA is only available to users with the

4) process 1. Basic Concepts: Oracle allows you to create and store compiled PL/SQL statements in the database. Program This type of program includes processes, functions, packages, and triggers. We can save the business logic, business rules, and

Select ename from ( Select ename, rownum rn from (Select * from EMP order by empno) Where rownum ) Where rn> = 4;   This is because in the CBO optimization mode, Oracle can push the outer query conditions to the inner query to

  Oracle job introduction Main scenarios Perform related operations on the background at regular intervals. For example, save the data of one table to another at every night, and 2. Back up the database at regular intervals. It is difficult to

Oracle 11g cannot install the em. Ear file.If the prompt says no... /Oracle/11g/Solaris/J2EE/oc4j_applications/applications/em. ear file. After the download of the 11g file, decompress the package and there are two folders. This error occurs

Having is similar to where, and can be used to determine which record to choose. Having determines the records to be displayed after grouping these records using group, The difference is that the WHERE clause filters the result set before the group,

  Transaction Processing: the so-called transaction processing is to ensure the integrity of the operation, all operations either succeed at the same time or fail at the same time. The principle is as follows: InOracleEvery window connecting to the

In the Oracle database (Simplified Chinese), data fields of the date type are difficult to access. The following is a record of some learning experience: 1. In the OEM of Simplified Chinese version, view the data of this type from the table data

Oracle entry book recommendationMany of my friends asked me to recommend Oracle's getting started books to learn about the basic concepts and knowledge of Oracle.I would like to recommend a few books.First of all, I would like to emphasize that any

Several project teams have begun to use the full-text index of oracle. Oracle's lexical analyzer is not smart enough for the lexical analysis of the zhs16gbk character set. It can only be mechanically matched in words. The utf8 character set

1. Basic operations   Emca-repos create creates an EM documentEmca-repos recreate re-creates an EM DatabaseEmca-repos drop delete an EM DatabaseEmca-config dbcontrol dB configure Database Control of the databaseEmca-deconfig dbcontrol dB deletes the

1) Overview: the programming language formed after procedural expansion of Oracle in the standard SQL language is a unique Oracle language that supports application development. 2) Syntax: 1. basic Structure declare -- declare some variables,

7) trigger 1. Two basic concepts: implement the constraints of complex business rules that are difficult to complete due to database integrity constraints; monitor various database operations to implement audit functions. Triggers are divided into:

I. Basic Concepts1) physical structure data files, control files, log files, parameter files, and backup files constitute the physical storage structure of the Oracle database. Control file management and control data files and log files 0. The

-- 1. Create a dedicated user under PLSQL-- Create the userCreate user user1Identified by \ "user1 \"Default tablespace usersTemporary tablespace tempProfile default;-- Grant/Revoke role privilegesGrant DBA to user1;-- Grant/Revoke SYSTEM

After changing the version, I suddenly wanted to discard XP and change it to Windows 7. During Oracle installation, the installation failed, the installation was unavailable, and there were even garbled characters. Cup .. The solution finally solved

Quickly create a user to import data Sqlplus/nolog Conn/As sysdba; Drop user Feiyang cascade; Create user Feiyang identified by Feiyang; Grant create session to Feiyang; Grant resource, connect, DBA to Feiyang; Conn Feiyang/Feiyang; Select

Installation Guide   First install Oracle database11g and weblogic11gFor all mobile clients, use JDK 1.6. For the Mobile Server, the JDK version required depends onWhat version of the application server you are using. • Oracle WebLogic Server 11g

-- First exceptionDeclareV_num number;BeginV_num: = 10/0;ExceptionWhen zero_divide then -- capture specific exceptionsDbms_output.put_line ('divisor cannot be 0 ');When others thenDbms_output.put_line ('error occurred '); -- catch all exceptionsEnd;-