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J茅r么me Dubar

Oracle Database Appliance vs Oracle Cloud Infrastructure

By | Cloud, Database Administration & Monitoring, Database management, Development & Performance, Hardware & Storage, Operation systems, Oracle | No Comments

Introduction Oracle Database Appliances are very popular these days. And not only among new customers for this kind of engineered systems. Almost all customers already using old generation ODAs are renewing their infrastructure by choosing again ODAs, meaning that the solution is good enough and probably better than anything else. But now, public clouds are a real alternative to on-premise servers, and Oracle Cloud Infrastructure is a solid competitor vs Amazon and Azure public clouds….

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Christian Weinfurtner

Upgrade to Oracle 19c – performance issue

By | Database Administration & Monitoring, Database management, Oracle | No Comments

In this blog I want to introduce you to a workaround for a performance issue which randomly appeared during the upgrades of several Oracle 12c databases to 19c I performed for a financial services provider. During the upgrades we ran into a severe performance issue after the upgrades of more than 40 databases had worked just fine. While most of them finished in less than one hour, we run into one which would have taken…

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Franck Pachot

Troubleshooting performance on Autonomous Database

By | Oracle | No Comments

By Franck Pachot . On my Oracle Cloud Free Tier Autonomous Transaction Processing service, a database that can be used for free with no time limit, I have seen this strange activity. As I’m running nothing scheduled, I was surprised by this pattern and looked at it by curiosity. And I got the idea to take some screenshot to show you how I look at those things. The easiest performance tool available in the Autonomous…

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J茅r么me Dubar

Make Oracle database simple again!

By | Database Administration & Monitoring, Database management, Development & Performance, Hardware & Storage, Operation systems, Oracle | 6 Comments

Introduction Let’s have a look at how to make Oracle database as simple as it was before. Oracle database is a great piece of software, yes it’s quite expensive, but it’s still the reference and most of the companies can find a configuration that fits their needs according to a budget. Another complain about Oracle is the complexity: nothing is really simple, and you’ll need skillful DBA(s) to deploy, manage, upgrade, troubleshoot your databases. But…

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Microsoft Team

Introducing Accelerated Database Recovery with SQL Server 2019

By | Database Administration & Monitoring, SQL Server | 2 Comments

SQL Server 2019 RC1 was released out a few weeks ago and it is time to start blogging about my favorite core engine features that will be shipped with the next version of SQL Server. Things should not be completely different with the RTM, so let鈥檚 introduce the accelerated database recovery (aka ADR) which is mainly designed to solve an annoying issue that probably most of SQL Server DBAs already faced at least one time:…

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Microsoft Team

SQL Server containers and docker network driver performance considerations

By | Database Administration & Monitoring, DevOps, Docker, SQL Server | No Comments

Few months ago I attended to the Franck Pachot session about Microservices and databases at SOUG Romandie in Lausanne on 2019 May 21th. He covered some performance challenges that can be introduced by Microservices architecture design and especially when database components come into the game with chatty applications. One year ago, I was in a situation where a customer installed some SQL Server Linux 2017 containers in a Docker infrastructure with user applications located outside…

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Microsoft Team

RCSI with foreign keys, NULL values and paramater sniffing behavior

By | Development & Performance, SQL Server | No Comments

In this blog post let鈥檚 go back to the roots (DBA concern) with a discussion with one of my friends about a weird transaction locking issue. In fact, this discussion was specifically around two questions. The first one was why SQL Server continues to use shared locks in RCSI mode leading to blocking scenarios and the second one was about compiled objects with weird NULL value parameter sniffing behavior. This discussion was very funny for…

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Oracle Team

When you change the UNDO_RETENTION parameter, the LOB segment鈥檚 retention value is not modified

By | Database Administration & Monitoring, Database management, Development & Performance, Hardware & Storage, Oracle | No Comments

Below, I will try to explain, a particular case for the general error : ORA-01555 snapshot too old error.. Normally, when we have this error, we are trying to adapt the retention parameters or to tune our queries. SQL> show parameter undo; NAME TYPE VALUE ———————————— ———– —————————— temp_undo_enabled boolean FALSE undo_management string AUTO undo_retention integer 3600 –extended from 900, undo_tablespace string UNDOTBS1 But,聽are some scenarios where the above rule is not working . We…

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Franck Pachot

Lighty for PostgreSQL

By | Database Administration & Monitoring, Postgres | No Comments

By Franck Pachot . If you follow this blog, you should know how I like Orachrome Lighty for Oracle, for its efficiency to monitor database performance statistics. Today Orachrome released the beta version of Lighty for Postgres: https://orachrome.com/news/la-beta-de-lighty-for-postgresql-est-ouverte/ The Cloud is perfect to do short tests with more resources than my laptop, especially the predictability of performance, then I started a Bitnami Postgres Compute service on the Oracle Cloud and did some tests with pgbench…

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