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

Oracle

Hybrid Histograms in Oracle 12c 09/26/2016

The right statistics and histograms can provide improved performance for queries and reports.  Read on to find out about Oracle’s new Hybrid histogram.

The Oracle Bug That Could Bite You Has No Teeth 09/12/2016

In a previous article Oracle declared bug 24390197 shouldn’t be; it’s the normal behavior for locally managed tablespaces with system-managed extents. Read on to see the details.

This Oracle Bug Could Bite You 08/29/2016

In Oracle 11.2.0.4 creating a table may fail even though space is available.  Read on to see the conditions that can make this happen.

Index Sanity in Oracle 08/11/2016

Careful testing and planning are crucial when deciding if an index is truly ‘unused’.  Read on to see what could happen if testing isn’t thorough.

Is Your Oracle Invisible Index REALLY Invisible? 07/25/2016

If you’re using invisible indexes, they may not be entirely ‘invisible’ to the optimizer. Read on to see why.

Returning The Actual DOP When Using Oracle’s Auto Degree Of Parallelism 07/14/2016

Without having an execution plan it’s difficult to know the degree of parallelism Oracle has selected.  Read on to see how that can be reported.

Oracle’s REMAINDER Function: The Result Isn’t Always Correct 06/27/2016

Oracle’s REMAINDER function can return negative results; read on to see why and what can be done to work around the issue.

Oracle's Calibrate_io Procedure: Why You Should Use It 06/13/2016

Oracle's calibrate_io procedure populates the data dictionary with disk 'performance' data to give the optimizer a fighting chance at a decent plan.  Read on to see why the data it generates may not be the most accurate with respect to performance.

Mutating Table Error In Oracle: Why It Happens And What You Can Do About It 05/31/2016

There are a lot of 'explanations' offered for the ORA-04091 error; read on to find out what is really going on and  how to address the situation.

Oracle SRVCTL Issue in 11.2.0.4 05/12/2016

When using Oracle 11.2.0.4 in a Grid configuration the srvctl utility can change the group on the Oracle executables, creating problems with locating the spfile and with disk access.

Re-thinking SQL Queries Using Sets in Oracle 04/28/2016

Sometimes it's good to re-think how to write a query; set operations can provide performance benefits over 'straight SQL'.  Read on to see an example of this in action.

Deletes In Oracle: More 'Costly' Than You Think 04/21/2016

Deletes may be more 'expensive' than the Oracle optimizer reports; read on to see why.

Oracle 12c Table Point-in-time Recovery 03/28/2016

There may be times when you need to recover a single table and flashback isn't configured and the recycle bin is turned off. Using RMAN in Oracle 12c it's possible to restore and recover a single table. Read on to see how it's done.

Partition Limits In Oracle 03/14/2016

Partitioning can be a real asset when used properly, as long as you don't run afoul of the maximum number of partitions Oracle will allow.  Read on to learn the maximum number of partitions and discover some of the errors you can see if you try to exceed the limit.

The One 'Security' Feature in Oracle You Probably Shouldn't Use 02/29/2016

Oracle offers a number of security-related settings, but one could definitely create more harm than good.  Read on to see which parameter that is, and why.

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