Oracle

Error Description:Since my Hadoop cluster is automatically installed with Cloudera Manager online, their installation path must follow the Cloudera rules, and only see the official documentation for Cloudera, see:/http

[Email protected]> CREATE TABLE emp_1 as SELECT * from EMP; --Schedule table created. [Email protected]> CREATE TABLE dept_1 as SELECT * from dept; --table created for main tables. [Email protected]> ALTER TABLE dept_1 add constraint pk_dept_1

Learning content:A. Creating A database and table spaceB. Create users and assign permissionsC. Create a data tableI. Creating a database and table space(i) Basic concepts of the SQL language1. ConceptAdvanced Structured Query Language and an

First, the comparison of the original scheme: Trigger/job/snapshot +dblink way, can be synchronized and timed refresh;Two different database servers, from one database server a user to read another database server B under a user's data, can be done

I. Using profile to manage user passwordsOverview: Profile is a collection of commands that are password-constrained and resource-constrained, and when a database is established, Oracle automatically establishes a profile called default. When the

In most cases, the query optimization strategy built into the Oracle database is still a success, but occasionally confused, even if there is an index, will do a full table scan, you can refer to the following statement, forcing the SELECT statement

GoalThe provides a oracle database unification Access agent layer, Unified management of connection pooling for all Oracle database user names, allowing multiple application systems to have the same database user common connection pool to save

--View table space Select Tablespace_name,file_id,file_name,round (Bytes/(1024 * 1024), 0) | |  M ' Total_spacefrom dba_data_filesorder by Tablespace_name; --Creating tablespace Create tablespace testlogging datafile '/data2/js/test_01.dbf ' size

Oracle's integrity constraintsThe integrity constraints in the database are:1. PRIMARY KEY constraint (Primary)2. Unique constraint (unique)3. Check constraints4. Non-null constraint (NOT NULL)- -belongs to the CHECK constraint5. FOREIGN KEY

The role of Table spaces:1. Determining the spatial allocation of database entities2. Set the share of the database user's space3. Control the availability of some of our database data4. Backing up and recovering dataHow to create a table space

This article reprinted from http://soft.chinabyte.com/database/6/12320006.shtml "Source: The bit network Tiger "　　Due to the new features of oracle11g, it is often encountered when using Sqlplus to log in to the Oracle database and prompt for

There are parentheses in the program Files (x86) path of the 64-bit Win7 system, and Oracle does not recognize such a path, so there is a problem that the database cannot be connected. So we can copy VS2010 's internal debug Web server

1, the applicable system is different: Bitmap index is suitable for OLAP system, and B-tree index is suitable for OLTP system.2, occupy different storage space: Bitmap index requires only a small amount of storage space, and the B-tree index needs

Usually when the relationship between the structure of the tree processing, this is a very complex thing, we can go through the program code to traverse the parent or child node by layer, the disadvantage is obvious, inefficient, operation

Linux Oracle deletes archive logs, and linuxoracle Oracle reported this error today: ORA-00257 Check that the archive logs of Oracle are full. Solution: Two 1. Increase the archive log size. 2. Delete useless archive logs. (select this solution)

A set of basic JDBC (Oracle database with Eclipse) OperationsJDBC: JDBC (Java Data Base Connectivity, java database connection) is a Java API used to execute SQL statements. It can provide unified access to multiple relational databases, it consists

ORACLE random number DBMS_RANDOM package, oracledbms_random To put it simply, there are four methods to call random numbers through the dbms_random package: 1. dbms_random.normal This function can return a number type of normal distribution without

The time displayed by Oracle SQL Developer includes the time, minute, and second settings. oracledeveloper Oracle SQL Developer is a free integrated development environment developed by Oracle. Oracle SQL Developer is a free, non-open-source

EBS xml publisher Chinese garbled Problem and Solution, ebspublisher Due to local environment problems, the xml publisher report cannot be run and the XML page cannot be displayed. XML input cannot be viewed using the XSL style sheet. Correct the

How to solve Oracle EBS R12-query requests whose output format is "text" in Excel with garbled characters, ebsr12 Prerequisites for reproduction: Concurrent Programs whose output format is "text": Valid responsibilities and users. How to add a