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Nicolas Jardot

OOW 2013: Solving customer issues with the 12c Optimizer (III) – Histogram on varchar2 column

By | Application integration & Middleware | No Comments

It has been a long time since the last Oracle 12c Optimizer article, but this one is the last on the series about customer issues in Oracle 11g. The goal of that series is to show how the new version 12c of Oracle Database helps solving these issues. This blog posting focuses on a well know Oracle behavior when gathering histograms on a varchar2 column. The three cases have been presented during the session “Solving…

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Nicolas Jardot

OOW 2013: Solving customer issues with the 12c Optimizer (II) – Histogram precision

By | Application integration & Middleware | No Comments

This article is the second on a series of 3 about customer issues in Oracle 11g. The goal is to show how the new version of Oracle solves these issues. This blog will focus on a common issue, when Oracle is not able to get a good histogram because some data is missing at the time the job gathers the statistics These 3 real customer cases have been presented during my session “Solving critical customer…

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Nicolas Jardot

OOW 2013 : Solving customer issues with the 12c Optimizer (I) – Adaptive execution plans

By | Application integration & Middleware | No Comments

During the last year, I faced many performance issues at customer sites with their applications. To solve the issues, I had to implement some workarounds because in most cases, the application code couldn’t be changed. As Oracle 12c is now available since more than 2 month, I decided to focus on how this new release will help our customers to solve their performance issues. I will present you 3 real customer cases reproduced in lab…

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Open source Team

PostgreSQL: PGDay France 2013 – un compte rendu

By | Technology Survey | No Comments

La conférence PostgreSQL “PGday Francophone 2013” s’est tenu jeudi 13 juin 2013 à Nantes. PgDay Fr est un événement organisé chaque année depuis 2009 par l’association ProgreSQLFr ayant pour objectif de mettre en relation les acteurs de la communauté PostgreSQL française et les utilisateurs de la base de données. L’event s’organise en une succession de présentations de 50 minutes et de pauses de 30 mn permettant aux participants d’échanger et de dialoguer. Un programme chargé…

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Gérard Wisson

DOAG 2012: News on WebLogic 12c, monitoring, licensing

By | Application integration & Middleware | No Comments

I spent three interesting days at the DOAG Konferenz 2012 – the German Oracle User Group’s conference. It was the 25th birthday and my first time as a DOAG Konferenz speaker. In this post, I will not talk about my presentation, but rather give you information from the sessions I went to. I will talk about three areas: Oracle WebLogic 12c, monitoring & diagnostics, and licensing. Regarding WebLogic, Mr. Munz from munz & more described…

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Stéphane Haby

Sté[email protected] 2012: Episode 1 – the Pre-Conf. Seminar

By | Technology Survey | No Comments

This morning, I was very happy to go to my first TechEd. Between the 10 seminars, as I said yesterday, I started with SQL Server 2008R2/2012 performance, tuning and optimization session. The thing is that we had just one session for the whole day. I will not copy the presentation of the 2 speakers (Thomas LaRock and Denny Cherry) who presented remarkably this session despite the failure of air conditioning during the morning. Fortunately, it…

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David Hueber

Using IOzone for Linux disk performance analysis

By | Operation systems | 7 Comments

Who never had to measure the disk performances on a system?

Speaking about Linux performance monitoring includes a significant part on disk performances. If you are facing applications or databases running slower than expected or than on other environments, you may take a look on the I/O performances.
This blog aims to provide to introduction to a pretty interesting tool, iozone…

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