Complément : Nouveautés d’Oracle Enterprise Manager 12c Release 4

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Complément : EM12 12c & ODA

Livre blanc intéressant sur l'installation d'Oracle Enterprise Manager 12c Release 3 sur une plate-forme Oracle Database Appliance :
http://www.oracle.com/technetwork/database/database-appliance/documentation/oda-oemcloudcontrol-2209378.pdf

How Exadata smartscans work

I guess everybody who is working with Oracle databases and has been involved with Oracle Exadata in any way knows about smartscans. It is the smartscan who makes the magic happen of full segment scans with sometimes enormously reduced scan times. The Oracle database does smartscans which something that is referred to as ‘offloading’. This is all general known information.

But how does that work? I assume more people are like me, and are anxious (more...)

My MySQL database impressions

I have been in the data and database world for over a decade now, working with mainly Oracle and data integration projects with Salesforce.

I have also spent time working with MySQL a relational database with open source roots, now part of Oracle. In this post I want to talk about my impressions of MySQL and some tips and tricks I learned working with it.

First and for all, you will have to be ready (more...)

Oracle Advanced Analytics and Oracle Fusion Apps

At a recent Oracle User Group conference, I was part of a round table discussion on Apps and BI. Unfortunately most of the questions were focused on Apps and the new Fusion Applications from Oracle. I mentioned that there was data mining functionality (using the Oracle Advanced Analytics Option) built into the Fusion Apps, it seems to come as a surprise to the Apps people. They were not aware of this built in functionality and (more...)

Oracle 11.2g install on OLE 6.x

This notes are really just a reminder to myself of the typical "issues" that I encounter every time I do a new install of OEL 6.x and 11.2.0.4

These notes are in addition to the excellent installation instructions given by oracle-base.com: oel install, DB 11.2.0.x install

The notes listed below are just a reminder to myself of things that I seem to always have to look (more...)

Hierarchical XML from SQL

Years ago I wrote an article (in Dutch) on the XML functions in Oracle SQL. It can be found here.
It describes how to create an xml document as an XMLType with an Oracle SQL Query.

The query that is described is based on a pretty simple table, with no relationships. I'm creating a new course based on a datamodel we created years ago, that contains data. I wanted to abstract some of that data (more...)

The OLAP Extension is now available in SQL Developer 4.0



Watch out with function result cache based on data dictionary views

Result cache is a powerful tool to gain performance in PL/SQL.
There are many examples on the internet that proves this, e.g. these articles on All things Oracle:
- Result Cache(1)
- Result Cache(2)

But I’m not going to talk about performance.
This article is some kind of warning.

First I’ll show you how result cache works on a normal view.
I’ll create a table, a view on this table and a function that (more...)

Oracle 12c VirtualBox VM

Just a quick note to highlight that the Oracle pre-built Developer VMs have been updated for Oracle 12c.

Oracle pre-built Developer VMs


Oracle Database 11gR2 (11.2.0.4) installation on Oracle Linux 6.4

In this post, I’m installing the Oracle Database 11g Release 2 (11.2.0.4) software on Oracle Linux 6.4, along with optional instructions on how to apply the latest Patch Set Update (PSU) to your new Oracle home. First and foremost, before you start, make sure your Linux server meets the minimum hardware requirements: 1GB of RAM (plus

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OSD-04400: unable to acquire internal semaphore for process and OS 183 (Windows)

I hit the following problem with a 9.2.0.8 database running on Windows 2003 this morning (info pulled from the alert log).  The database had failed to restart after a client’s cold backup process ALTER DATABASE MOUNT Wed Jan 15 22:32:08 2014 ORA-09341: scumnt: unable to mount database OSD-04400: unable to acquire internal semaphore for process

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Exadata Storage Server Version 12.1.1.1.0 Released

Oracle has released the much-anticipated version of cellsrv compatible with Oracle Database 12.1.0.1 (patch #16980054). Before thinking about upgrading, read MOS note #1571789.1 carefully.  Unless you are planning to run database 12c on your Exadata, it would be advisable to continue down the 11.2 branch (more...)

Oracle Announces Exadata X4-2

Today, Oracle announced the Exadata X4-2 model.  The X4 has some considerable improvements, namely:

  • 12-core Intel Xeon e5-2697 CPUs, up from the 8-core models found in the X3-2 (hello, database licenses!)
  • 256GB RAM per database server, upgradeable to 512GB
  • 96GB RAM per storage server
  • 800GB Sun Flash F80 cards (more...)

OSP #2c: Build a Standard Platform from the Bottom-Up

This is the fourth of twelve articles in a series called Operationally Scalable Practices. The first article gives an introduction and the second article contains a general overview. In short, this series suggests a comprehensive and cogent blueprint to best position organizations and DBAs for growth.

This article – building (more...)

Read consistency overhead

SQL performance can degrade for many reasons, some of most common are:
- plan changes
- data skewness
- low caching efficiency
- data growth
- contention.

All these factors are relatively well known. A somewhat less common, although not exceptionally rare scenario, is read consistency overhead due to concurrent (more...)

Oracle Database 12c PRAGMA UDF and WITH clause enhancements

Here are two interesting enhancements in Oracle database 12c PL/SQL. PL/SQL subprogram defined using WITH clause of a subquery – Oracle database 12c allows PL/SQL declaration section in the WITH clause. One can define PL/SQL function or procedure into a WITH clause. Functions declared in the PL/SQL declaration section can (more...)

Stuck Timezone Upgrades and Smart Scans

I heard a strange report from a client late last week - they weren't getting any smart scans on their Exadata - a data warehouse, no less (and we checked to see if cell_offload_processing was set to true).  Queries would run normally, but for some reason, the "cell physical IO (more...)

Tightening Security with SELECT ANY DICTIONARY in Oracle 12c

Developers and users sometimes request the SELECT ANY DICTIONARY system privilege to enable them to view various data dictionary tables.  This may be fine for querying DBA_TABLES, etc, but the Oracle data dictionary contains a LOT of information.  Some of the views/tables are compromising from a security standpoint. (more...)

Data Pump 12c – Pumping Data with the LOGTIME Parameter

Since its release, Oracle Data Pump has been a worthy successor to the traditional exp/imp tools.  However, one area lacking with Data Pump has been something as simple as the ability to identify how long each step of a Data Pump job actually takes.  The log will show (more...)