Oracle 10g to 8i

From 8.0 extended rowid to 12c pluggable db: Why Oracle Database is still a great software

By Franck Pachot . Do you know why Oracle Database is a leader in the database market since 30 years? Do you know any other software that is still the leading solution after decades? I think that it is(…)

How to remap tablespaces using Oracle Import/Export Tool

Since Oracle 10g, Oracle provides a great tool to import and export data from databases: Data Pump. This tool offers several helpful options, particularly one that allows to import data in a different tablespace than the source database. This parameter(…)

Block Corruption Oracle 10g vs Oracle 11g

Ayant rencontré récemment des problèmes de blocs corrompus sur des bases Oracle en version Oracle 10g et Oracle 11g, des différences notables sont apparues notamment au niveau de la vue v$database_block_corruption. Je vous livre dans ce post le résultat(…)

Database space management issue with Grid Control 11g

My colleague Hervé Schweitzer reported a very interesting issue to me. It is about the usage of Grid Control 11g while monitoring the available space on an Oracle database – in our case a 10.2.0.3 target database. This post continues(…)

Take care while upgrading your Oracle DB with “DBUA”

Last Week at my Customer, I used dbua to upgrade an oracle database 10h to 11g, the migration run successfully. But next day I had a monitoring message that the diag directory is groing very fast.

LOB : « enq : HW contention » 

Aprés le post sur « Utilisons les securefile », revenons sur le sujet LOB avec une approche performance, stockage.  Nous rencontrons parfois des modèles de données étranges, nous aurions envies en tant que DBA de tout reprendre à(…)

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(…)

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.

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(…)

Oracle index compression: eliminating duplicate column values

Index compression comes from Oracle 8i and has quite the same mechanism as table compression. Index compression eliminates duplicate column values in the leaf blocks. Let's see how it works:(…)