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Development & Performance

Stéphane Haby

SQL Server 2019: Java in SQL Server hard to believe, no?

By | Development & Performance, DevOps, SQL Server, Technology Survey | No Comments

It has already been a few months that we are testing the next version of SQL Server: SQL Server 2019. I already blogged about a previous version of SQL Server supporting R and Python. With the new version of SQL Server 2019, Java will also be integrated. The Java runtime used is Zulu Open JRE and can be tested from the CTP3.2 of SQL Server 2019 Step 1: The installation Like a lot of people,…

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Markus Segmüller

work Agile in a GxP-regulated environment

By | Development & Performance | No Comments

On 4 June 2019 I followed an invitation to wega-it’s Know-how & Networking Breakfast 2 2019 on “Agile Validation in GxP Projects”. So they were to discuss Agility in the context of GxP regulation. I had some earlier exposure to various kinds of compliance roles and topics, and my current work environment is in the highly regulated Pharma industry. So I was really wondering (and hoping for learning) how you can possibly bring the two…

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Alain Lacour

APEX Connect 2019 – Day 1

By | Application integration & Middleware, Development & Performance, Oracle | No Comments

This year again the APEX connect conference spans over three days with mixed topics around APEX, like JavaScript, PL/SQL and much more. After the welcome speech and the very funny and interesting Keynote about “PL/SQL: A Career Built On Top Of PL/SQL – 25 years of Coding, Sharing, and Learning” by Martin Widlake, I decided to attend presentations on following topics: – Oracle Text – A Powerful Tool for Oracle APEX Developers – Make It…

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David Barbarin

RCSI with foreign keys, NULL values and paramater sniffing behavior

By | Development & Performance, SQL Server | No Comments

In this blog post let’s 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’s 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, are some scenarios where the above rule is not working . We…

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Lazhar Felahi

SQL Tuning – Mix NULL / NOT NULL Values

By | Development & Performance, Oracle | No Comments

One of the difficulty when writing a SQL query (static SQL) is to have in the same Where Clause different conditions handling Null Values and Not Null Values for a predica. Let’s me explain you by an example : Users can entered different values for a user field from an OBI report: – If no value entered then all rows must be returned. – If 1 value entered then only row(s) related to the filter…

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Oracle Team

Recover a corrupted datafile in your DataGuard environment 11G/12C.

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

On a DG environment, a datafile needs to be recovered on the STANDBY site, in two situations : when is deleted or corrupted. Below, I will explain  how to recover a corrupted datafile, in order to be able to repair the Standby database, without to be necessary to restore entire database. Initial situation : DGMGRL> connect / Connected to “PROD_SITE2” Connected as SYSDG. DGMGRL> show configuration; Configuration – CONFIG1 Protection Mode: MaxPerformance Members: PROD_SITE2 -…

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Pierre-Yves Brehier

DOAG 2018 – What to learn from a battle on IT technologies?

By | Development & Performance | No Comments

This year’s my 6th participation with dbi services at the DOAG Conference + Exhibition Nuremberg (as a “non-techie” attendee, no need to say), but it was my very first battle on IT technologies. And it was fun! On the DOAG 2018 Conference + Exhibition DOAG 2018 Conference + Exhibition is taking place November 20 – 23, 2018 in Nuremberg. Participants have the opportunity to attend a three-day lecture program with more than 400 talks and…

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Christophe Cosme

Pass summit – day 4

By | Big Data, Business Intelligence, Cloud, Database Administration & Monitoring, Development & Performance | No Comments

Optimizing Multi-Billion Row Tables in Tabular in 2018   I wanted to attend the session moderated by Marco Russo to see his approach of optimizing performance in Tabular model The first thing to understand is how the data is stored and organized in a Tabular model. It is of course using the xVelocity in-memory capabilities with the Vertipac column storage layout engine. It organizes the data, compressing  it by column,  in combination with a dictionary…

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