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How To Call a Stored Function with Parameters
How To Call a Stored Function with Parameters? - Oracle DBA FAQ - Creating Your Own PL/SQL Procedures and Functions You can define a function that takes parameters, provide values to those parameters when calling the function. Here is a good example of a function with a parameter: SQL> CREATE OR REP... 2007-04-25, 5175👍, 0💬

What To Do If DBA Lost the SYSTEM Password
What To Do If DBA Lost the SYSTEM Password? - Oracle DBA FAQ - Introduction to Command-Line SQL*Plus Client Tool If the DBA lost the password of the SYSTEM user account, he/she can go to the Oracle server machine, and run SQL*Plus on server locally with the operating system authentication method to ... 2007-04-28, 5174👍, 0💬

How To Do a Full Database Export
How To Do a Full Database Export? - Oracle DBA FAQ - Loading and Exporting Data If you are ready to do a full database export, you can use the FULL=y parameter on the expdp command, as shown in the following tutorial exercise: >expdp SYSTEM/fyicenter FULL=y ESTIMATE_ONLY=y Starting "SYSTEM"."SYS_EXP... 2007-05-01, 5172👍, 0💬

How To Define a Cursor Variable
How To Define a Cursor Variable? - Oracle DBA FAQ - Working with Cursors in PL/SQL To define cursor variable, you must decide which REF CURSOR data type to use. There are 3 ways to select a REF CURSOR data type: Define your own specific REF CURSOR types using the TYPE ... RETURN statement. Define yo... 2007-04-28, 5172👍, 0💬

What Are DML Statements
What Are DML Statements? - Oracle DBA FAQ - Understanding SQL DML Statements DML (Data Manipulation Language) statements are statements to change data values in database tables. The are 3 primary DML statements: INSERT - Inserting new rows into database tables. UPDATE - Updating existing rows in dat... 2007-04-22, 5168👍, 0💬

What Is NULL in PL/SQL
What Is NULL in PL/SQL? - Oracle DBA FAQ - Understanding PL/SQL Language Basics NULL is a reserved key word and it stands for two things in PL/SQL: NULL is an executable statement, and means doing nothing. NULL is a data balue, and means no value. The following sample script shows you examples of us... 2007-04-29, 5167👍, 0💬

How To Download Oracle Database 10g XE
How To Download Oracle Database 10g XE? - Oracle DBA FAQ - Introduction to Oracle Database 10g Express Edition If you want to download a copy of Oracle Database 10g Express Edition, visit http://www.oracle.com/technolo gy/software/products/database/ xe/.If you are using Windows systems, there are dow... 2007-04-23, 5165👍, 0💬

How To Use "startup" Command to Start Default Instance
How To Use "startup" Command to Start Default Instance? - Oracle DBA FAQ - Introduction to Oracle Database 10g Express Edition If you logged in to the server as a SYSDBA, you start the default instance with the "startup" command. Here is how to start the default instance in SQL*Plus in SYSDBA mode: ... 2007-04-24, 5163👍, 0💬

How To Loop through Data Rows in the Implicit Curosr
How To Loop through Data Rows in the Implicit Curosr? - Oracle DBA FAQ - Working with Cursors in PL/SQL You use the FOR ... IN ... LOOP statement to loop through data rows in the implicit cursor as the following syntax: FOR row IN dml_statement LOOP (statement block with row.field) END LOOP; Here "r... 2007-04-29, 5162👍, 0💬

How To Insert a Record into a Table
How To Insert a Record into a Table? - Oracle DBA FAQ - Working with Database Objects in PL/SQL If you have a RECORD variable with data fields matching a table structure, you can insert a row to this table with this RECORD variable using the INSERT statement as shown in the example below: CREATE TAB... 2007-04-26, 5155👍, 0💬

What Is Oracle Server Autotrace
What Is Oracle Server Autotrace? - Oracle DBA FAQ - Introduction to Command-Line SQL*Plus Client Tool Autotrace is Oracle server feature that generates two statement execution reports very useful for performance tuning: Statement execution path - Shows you the execution loop logic of a DML statement... 2007-04-29, 5154👍, 0💬

How To Write a Query with a Full Outer Join
How To Write a Query with a Full Outer Join? - Oracle DBA FAQ - Understanding SQL SELECT Query Statements If you want to query from two tables with a full outer join, you can use the FULL OUTER JOIN ... ON clause in the FROM clause. The following query returns output with a full outer join from two ... 2007-04-19, 5154👍, 0💬

How To Add Another Datafile to a Tablespace
How To Add Another Datafile to a Tablespace? - Oracle DBA FAQ - Managing Oracle Tablespaces and Data Files If you created a tablespace with a data file a month ago, now 80% of the data file is used, you should add another data file to the tablespace. This can be done by using the ALTER TABLESPACE ..... 2007-05-03, 5150👍, 0💬

Can Multiple Columns Be Used in GROUP BY
Can Multiple Columns Be Used in GROUP BY? - Oracle DBA FAQ - Understanding SQL SELECT Query Statements You can use multiple columns in the GROUP BY clause as shown in the following example. It returns how many employees are having the same salary in each department: SQL> SELECT department_id, salary... 2007-04-20, 5149👍, 0💬

How To Add a New Column to an Existing Table
How To Add a New Column to an Existing Table? - Oracle DBA FAQ - Understanding SQL DDL Statements If you have an existing table with existing data rows, and want to add a new column to that table, you can use the ALTER TABLE ... ADD statement to do this. Here is an example script: SQL> connect HR/fy... 2007-04-22, 5148👍, 0💬

What Is a Data Lock
What Is a Data Lock? - Oracle DBA FAQ - Understanding SQL Transaction Management A data lock is logical flag the Oracle server is placed on data objects to give an exclusive right to a transaction. Statements in other transactions needs to respect data locks based on certain rules. Rules on data loc... 2007-04-17, 5147👍, 0💬

How To Define a Procedure inside Another Procedure
How To Define a Procedure inside Another Procedure? - Oracle DBA FAQ - Introduction to PL/SQL Define a procedure inside another procedure is supported by PL/SQL. The following tutorial script shows you an example: SQL> CREATE OR REPLACE PROCEDURE HR.DBA_WEEK AS 2 PROCEDURE DBA_TASK (day VARCHAR2) AS... 2007-04-26, 5140👍, 0💬

How To Assign Data of the Deleted Row to Variables
How To Assign Data of the Deleted Row to Variables? - Oracle DBA FAQ - Working with Database Objects in PL/SQL If a DELETE statement is deleting a single row, you can assign column values of the deleted row to variables by using the RETURNING clause, which an extension of DELETE statements for PL/SQ... 2007-04-27, 5139👍, 0💬

How Data Locks Are Respected
How Data Locks Are Respected? - Oracle DBA FAQ - Understanding SQL Transaction Management Here are the rules on how data locks are respected: All statements ignore data locks owned its own transaction. SELECT query statements ignores data locks owned by any transactions. INSERT, UPDATE, and DELETE s... 2007-04-17, 5139👍, 0💬

How To View the Tablespaces in the Current Database
How To View the Tablespaces in the Current Database? - Oracle DBA FAQ - Managing Oracle Tablespaces and Data Files If you want to get a list of all tablespaces used in the current database instance, you can use the DBA_TABLESPACES view as shown in the following SQL script example: SQL> connect SYSTE... 2007-05-03, 5137👍, 0💬

What Are the Differences between DATE and TIMESTAMP
What Are the Differences between DATE and TIMESTAMP? - Oracle DBA FAQ - Understanding SQL Basics The main differences between DATE and TIMESTAMP are: DATE stores values as century, year, month, date, hour, minute, and second. TIMESTAMP stores values as year, month, day, hour, minute, second, and fra... 2007-04-24, 5137👍, 0💬

How To Recover a Dropped Table
How To Recover a Dropped Table? - Oracle DBA FAQ - Managing Oracle Database Tables If you accidentally dropped a table, can you recover it back? The answer is yes, if you have the recycle bin feature turned on. You can use the FLASHBACK TABLE ... TO BEFORE DROP statement to recover a dropped table f... 2007-05-03, 5136👍, 0💬

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, 5135👍, 0💬

How To Update Values in a Table
How To Update Values in a Table? - Oracle DBA FAQ - Understanding SQL DML Statements If you want to update some values in one row or multiple rows in a table, you can use the UPDATE statement. The script below shows a good example: UPDATE fyi_links SET counts = 999, notes = 'Good site.' WHERE id = 1... 2007-04-21, 5131👍, 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