Database Journal
MS SQL Oracle DB2 Access MySQL PostgreSQL Sybase PHP SQL Etc SQL Scripts & Samples Links Database Forum

» Database Journal Home
» Database Articles
» Database Tutorials
MS SQL
Oracle
DB2
MS Access
MySQL
» RESOURCES
Database Tools
SQL Scripts & Samples
Links
» Database Forum
» Slideshows
» Sitemap
Free Newsletters:
DatabaseDaily  
News Via RSS Feed


follow us on Twitter
Database Journal |DBA Support |SQLCourse |SQLCourse2
 

Oracle database management, tutorials, scripts, coding, programming and tips for database administrators

Oracle

Is My Oracle Index Being Used? 08/31/2015

Finding 'unused' indexes in Oracle isn't an easy task for a number of reasons.  Read on to see why an index you might think isn't used probably is and discover the long path to dealing with such indexes.

Deciding On A Primary Key In Oracle 08/13/2015

Declaring a primary key isn't always easy, as some choices that look good at the start aren't the best choices when they're examined in depth. Read on to find out what data would make a good key, when to use a surrogate key and when to combine the two.

Delayed Block Cleanout in Oracle 07/27/2015

Delayed block cleanout can be frustrating when it generates errors. Read on to see what it is and what you can do about it.

Demystifying Oracle's Clustering Factor 07/13/2015

The index property 'clustering factor' relies on the table data location, which is why rebuilding an index won't affect it.  Read on to see what the clustering factor represents and  how 'fixing' it for one index can make it worse for others created against the same table.

A Brief History of Oracle Backup and Recovery 06/29/2015

Over the years Oracle backup and recovery has changed significantly, from manual backups to the most recent version of RMAN.  Read on to see where we were and where we are now.

Monitoring Tablespace Usage in Oracle 06/11/2015

Monitoring tablespace space is a constant, yet necessary, task.  It's changed over the years and releases, so read on to see how it used to be done and what new views are available to make the task easier.

Stoptimizing Oracle 05/25/2015

According to Jonathan Lewis: "Stoptimisation - the art of optimization by not doing the things you don't need to do."  Read on to see what things you may be doing that you shouldn't be doing.

Bulk Exceptions in Oracle 05/14/2015

When using BULK COLLECT it's possible to see all of the exceptions thrown for the bulk collection by coding the exception handler properly.  Read on to see how to implement such an exception handler.

Cartesian Joins in Oracle: The Nullable Column Problem 04/27/2015

NULL values in a table can cause Oracle to decide to use a Cartesian join with large data sets.  Read on to see one way this can be addressed.

More Than Oracle Knows What To Do With 04/13/2015

In Oracle 12c an interesting problem arises with ANSI joins, star expansion and tables with 500 columns or more.  Read on to find out what happens and how you can work around the problem.

Hitting The Oracle Target 03/30/2015

SGA and PGA management can be confusing.  Oracle can make it easier with two views that provide advice on how to set the associated parameters.  Read on to see what those views are and how to read the data.

CBO, Analytic functions and Cardinalities in Oracle 11.2 03/12/2015

In Oracle 11.2 using analytic functions can generate 'interesting' cardinality values that are far larger than they should be.  Read on to see just how far off those values can be.

My Oracle Cup Overflows 02/23/2015

Overflow data in an index-organized table is usually put in its own tablespace.  Sometimes it isn't; read on to see what overflow data is and how to change where it's located.

Oracle: MERGE 'Monkey-business' 02/12/2015

Odd errors can result in odd 'solutions', and Oracle has one for the MERGE statement.  Read on to see what it is and what it fixes.

Oracle: The Nuts And Bolts Of Basic Compression 01/26/2015

Oracle provides several levels of compression, with BASIC compression requiring no additional license cost. Read on to find out how this level of compression works and what you may expect when using it.

Oracle Archives




Latest Forum Threads
Oracle Forum
Topic By Replies Updated
Oracle Data Mining: Classification jan.hasller 0 July 5th, 07:19 AM
Find duplicates - Unique IDs Lava 5 July 2nd, 08:30 AM
no matching unique or primary key rcanter 1 April 25th, 12:32 PM
Update values of one table based on condition of values in other table using Trigger Gladiator 3 February 29th, 06:01 PM













Thanks for your registration, follow us on our social networks to keep up-to-date