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How To Define a Data Field as NOT NULL
How To Define a Data Field as NOT NULL? - Oracle DBA FAQ - Working with Database Objects in PL/SQL When defining a specific RECORD type, you can define a data field as NOT NULL to make sure variables with this RECORD type to always have values in this field. A field defined as NOT NULL must have a d... 2007-04-27, 5140👍, 0💬

What Privilege Is Needed for a User to Connect to Oracle Server
What Privilege Is Needed for a User to Connect to Oracle Server? - Oracle DBA FAQ - Managing Oracle User Accounts, Schema and Privileges Oracle deny connection to users who has no CREATE SESSION privilege. Try the following tutorial exercise, you will find out how Oracle denies connection: >.\bin\sq... 2007-05-02, 5137👍, 0💬

Can You Drop an Index Associated with a Unique or Primary Key Constraint
Can You Drop an Index Associated with a Unique or Primary Key Constraint? - Oracle DBA FAQ - Managing Oracle Table Indexes You can not delete the index associated with a unique or primary key constraint. If you try, you will get an error like this: ORA-02429: cannot drop index used for enforcement o... 2007-05-02, 5136👍, 0💬

How To Use Attributes of the Implicit Cursor
How To Use Attributes of the Implicit Cursor? - Oracle DBA FAQ - Working with Cursors in PL/SQL Right after executing a DML statement, you retrieve any attribute of the implicit cursor by using SQL%attribute_name, as shown in the following tutorial exercise: CREATE TABLE student (id NUMBER(5) PRIMAR... 2007-04-29, 5136👍, 0💬

How To Write Numeric Literals
How To Write Numeric Literals? - Oracle DBA FAQ - Understanding SQL Basics Numeric literals can coded as shown in the following samples: SELECT 255 FROM DUAL -- An integer 255 SELECT -6.34 FROM DUAL -- A regular number -6.34 SELECT 2.14F FROM DUAL -- A single-precision floating point 2.14 SELECT -0.... 2007-04-24, 5132👍, 0💬

Is Oracel SQL Developer written in Java
Is Oracel SQL Developer written in Java? - Oracle DBA FAQ - Introduction to Oracle SQL Developer Oracel SQL Developer is written in Java. It requires JDK 1.5, which is already included in your download file. 2007-04-26, 5128👍, 0💬

What To Do If the StartBD.bat Failed to Start the XE Instance
What To Do If the StartBD.bat Failed to Start the XE Instance? - Oracle DBA FAQ - Introduction to Oracle Database 10g Express Edition If StartBD.bat failed to start the XE instance, you need to try to start the instance with other approaches to get detail error messages on why the instance can not b... 2007-04-24, 5128👍, 0💬

What Is the Quickest Way to Export a Table to a Flat File
What Is the Quickest Way to Export a Table to a Flat File? - Oracle DBA FAQ - Loading and Exporting Data The quickest way to export a table to a flat file is probably to use the SQL*Plus SPOOL command. It allows you to record SELECT query result to a text file on the operating system. The following ... 2007-04-30, 5127👍, 0💬

How To Create an Oracle Database
How To Create an Oracle Database? - Oracle DBA FAQ - Creating New Database Instance Manually There are two ways to create a new database: Use the Database Configuration Assistant (DBCA) to create a database interactively. Use the CREATE DATABASE statement to create a database manually. 2007-04-22, 5127👍, 0💬

What To Do If the Binary SPFile Is Wrong for the Default Instance
What To Do If the Binary SPFile Is Wrong for the Default Instance? - Oracle DBA FAQ - Introduction to Oracle Database 10g Express Edition Let's say the SPFile for the default instance is a binary file, and some settings are wrong in the SPFile, like SGA setting is bellow 20MB, how do you change a se... 2007-04-25, 5126👍, 0💬

How To Connect the Oracle Server as SYSDBA
How To Connect the Oracle Server as SYSDBA? - Oracle DBA FAQ - Creating New Database Instance Manually This is Step 4. The best way to connect to the Oracle server as an administrator is to use SQL*Plus. You need to run SQL*Plus with /nolog option and use the CONNECT with blank user name, blank pass... 2007-04-23, 5126👍, 0💬

How To Retrieve Data from an Cursor to a RECORD
How To Retrieve Data from an Cursor to a RECORD? - Oracle DBA FAQ - Working with Cursors in PL/SQL If you have a cursor opened ready to use, you can also use the FETCH statement to retrieve data from the cursor into a RECORD variable as shown in the tutorial exercise below: CREATE OR REPLACE PROCEDU... 2007-04-29, 5125👍, 0💬

What Is Oracle SQL Developer
What Is Oracle SQL Developer? - Oracle DBA FAQ - Introduction to Oracle SQL Developer Oracle SQL Developer is a new, free graphical tool that enhances productivity and simplifies database development tasks. With SQL Developer, you can browse database objects, run SQL statements and SQL scripts, and ... 2007-04-26, 5125👍, 0💬

What Privilege Is Needed for a User to Query Tables in Another Schema
What Privilege Is Needed for a User to Query Tables in Another Schema? - Oracle DBA FAQ - Managing Oracle User Accounts, Schema and Privileges For a user to run queries (SELECT statements) on tables of someone else's schema, he/she needs the SELECT ANY TABLE privilege. The following tutorial exercis... 2007-05-01, 5124👍, 0💬

What is a Database Schema
What is a Database Schema? - Oracle DBA FAQ - Oracle Basic Concepts A schema is a collection of logical structures of data, or schema objects. A schema is owned by a database user and has the same name as that user. Each user owns a single schema. Schema objects can be created and manipulated with S... 2007-04-21, 5119👍, 0💬

How To Use Group Functions in the SELECT Clause
How To Use Group Functions in the SELECT Clause? - Oracle DBA FAQ - Understanding SQL SELECT Query Statements If group functions are used in the SELECT clause, they will be used on the rows that meet the query selection criteria, the output of group functions will be returned as output of the query.... 2007-04-20, 5118👍, 0💬

What Happens to the Current Transaction If the Session Is Killed
What Happens to the Current Transaction If the Session Is Killed? - Oracle DBA FAQ - Understanding SQL Transaction Management If a session is killed by the DBA, the current transaction in that session will be rolled back and ended. All the database changes made in the current transaction will be rem... 2007-04-18, 5118👍, 0💬

How To Use FETCH Statement in a Loop
How To Use FETCH Statement in a Loop? - Oracle DBA FAQ - Working with Cursors in PL/SQL If you have a cursor opened ready to use, you can also use the FETCH statement in a loop to retrieve data from the cursor more efficiently. But you need to remember to use an EXIT statement break the loop when th... 2007-04-29, 5110👍, 0💬

What Happens to the Data Files If a Tablespace Is Dropped
What Happens to the Data Files If a Tablespace Is Dropped? - Oracle DBA FAQ - Managing Oracle Tablespaces and Data Files If a tablespace is dropped, what happens to its data files? By default, data files will remain in OS file system, even if the tablespace they are mapped is dropped. Of course, you... 2007-05-03, 5108👍, 0💬

How To Create a Stored Program Unit
How To Create a Stored Program Unit? - Oracle DBA FAQ - Introduction to PL/SQL If you want to create a stored program unit, you can use the CREATE PROCEDURE or FUNTION statement. The example script below creates a stored program unit: SQL> set serveroutput on; SQL> CREATE PROCEDURE Hello AS 2 BEGIN ... 2007-04-25, 5106👍, 0💬

How To Create a Server Parameter File
How To Create a Server Parameter File? - Oracle DBA FAQ - Creating New Database Instance Manually This is Step 5. The initialization parameter file is good to get an Oracle database instance started. But it is not ideal run an instance as production. You need to convert the initialization parameter ... 2007-04-23, 5103👍, 0💬

How To Define an Explicit Cursor
How To Define an Explicit Cursor? - Oracle DBA FAQ - Working with Cursors in PL/SQL An explicit cursor must be defined in the declaration part of a procedure or function with the CURSOR ... IS statement as shown in the following sample script: DECLARE CURSOR c_list IS SELECT * FROM countries; CURSOR... 2007-04-29, 5101👍, 0💬

What Do You Think about Oracle SQL Developer
What Do You Think about Oracle SQL Developer? - Oracle DBA FAQ - Introduction to Oracle SQL Developer To conclude this introductory FAQ collection, you should think about Oracle SQL Developer in comparison with other client tools like SQL*Plus and Oracle Web interface. SQL Developer is definitely be... 2007-04-28, 5098👍, 0💬

What Is SQL
What Is SQL? - Oracle DBA FAQ - Understanding SQL Basics SQL, SEQUEL (Structured English Query Language), is a language for RDBMS (Relational Database Management Systems). SQL was developed by IBM Corporation. 2007-04-24, 5098👍, 0💬

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.NET C C++ CSS DBA General HTML Java JavaScript JSP JUnit MySQL Networking Oracle Perl Perl PHP PL/SQL RSS Software QA SQL Server Struts Unix Windows XHTML XML