Oracle 11g

Diving into Databases

By dbi services, we are a few poeples passionate by diving.We take this opportunity to let you dive into the two databases lakes Oracle and SQL server and see their similarities and differences. For this first level of diving(…)

Oracle 11g R2: catupgrd.sql running for hours

During the last weeks, I was confronted to an uncommon bug during the database upgrade from security sensibledatabases. The upgrade was sticking for hours on the script c1101000.sql.  which tried to fill the column DBID with the database DBID of(…)

Inside Grid Control

Lors de mon activité de consultant, et suite à un bug qui n'affiche pas correctement le nombre de CPU (OMS 10.2.0.5, agent 10.2.0.5 et linux x86_64), je me suis intéressé à la manière dont Oracle(…)

RMAN backup is failing due to “corrupt blocks”

Last week, I was not able to complete a backup because of the ORA-19566 error: “exceeded limit of 0 corrupt blocks”. Here is what you can do to fix it. Starting Point: backup error Here is(…)

Oracle Basics (3) – Database startup and shutdown

It's already quite a while that I posted my last article on the Oracle basis, so I decided to take some times in the train to continue this small serie.This time, I'm going to speak about one of the(…)

How to retrieve previous table statistics using Oracle dbms_stats

Sometimes, you need to modify the statistics of a table. There are various reasons: either for the performance analysis or because the execution plan changed. Oracle offers two methods: statistics restore or statistics export. Both are in the dbms_stats package.

A SQL statement is slow and suddenly fast? Have a look at “Cardinality Feedback”!

Discussing with some tuning gourous we were made aware about this feature. It is not so far from the adaptive cursor sharing perfectly described in  Chris's blog : http://antognini.ch/papers/BindVariablePeeking_20090718.pdfThis feature, compares the real execution(…)

Stop looking for Oracle and MySQL documentation: use the dbi services firefox add-ons!

Are you often trying to find some functionalities into ORACLE 10gR2, ORACLE 11gR2 or MySQL documentation ? Of course each time you are looking for this documentation you find unofficial documentation which is never corresponding to the version you are(…)

Simulating database-like I/O activity with Flexible I/O

You do not want to install or configure swingbench, load runner etc. – just to test the performance of your I/O system based on filesystems? Then Flexible I/O is the right tool for you. This post provides an overview. In(…)

Oracle 11g Instance Caging – limit database CPU consumption

As you certainly already have heard Oracle 11g came with a new feature called “Instance caging”. This feature allows Oracle DBA to easily manage Oracle Instance CPU-consumption. How does it work? Quite easily … see below(…)