Everything our consultants learn while running databases for customers: Oracle, PostgreSQL, SQL Server, MySQL, MariaDB, MongoDB and Delphix. Expect hands-on posts about installation, day-to-day administration, backup and recovery, performance tuning, replication and upgrades.
By Franck Pachot . This post is about the case I had where a GTT was generating too much undo. The effects were amplified by the fact that the database was in flashback logging (see Jonathan Lewis answer in my question on OTN forum about that, but that’s for the next post. Nothing here is specific to GTT, but generating…
In a previous blog post called Backup a SQL Server database from On-Premise to Azure, I presented the different tools to backup your on-premise databases on Azure Storage. SQL Server Managed Backup to Windows Azure was one of these tools. In my opinion, Managed Backup is a great tool. That is why I decided to dedicate an entire blog to…
By Franck Pachot . This is a second part of the previous post about metadata link. I’ve shown how a sharing=metadata function becomes a sharing=none function when it is changed in the pdb – i.e when not having the same DDL, not having a different signature. Here is another experimentation doing the opposite: change the function in root and see…
By Franck Pachot . As in previous posts (1 and 2) I’m still playing with multitenant dictionary. You may wonder why I’m spending time to do unsupported things that we will never be able to use in real life. Of course, playing with internals is fun 😉 But it’s not only that. We will implement CDB databases (multi-tenant, and single-tenant…
By Franck Pachot . I’ve described Oracle 12c metadata and object links internals in a previous post. But before that, the first time I investigated on it, I made a wrong assumption because I was looking at AUDIT_ACTIONS which is not correctly implemented. That investigation came from a question on dba-village. And recently Ivica Arsov (@IvicaArsov) has made an interesting…
By Franck Pachot . Ivica Arsov (@IvicaArsov) has made an interesting comment about AUDIT_ACTIONS object link table. I’ll blog about it soon, but in the meantime when checking its definition in cataudit.sql it came upon the following: /* SCHEMA SYNONYMS will be added in 12g */ — insert into audit_actions values (222, ‘CREATE SCHEMA SYNONYM’); — insert into audit_actions values…
The end of the year approachs and soon it will be time to celebrate Christmas with your family and friends. At dbi services, we wish you a merry christmas via SQL Server with the following script, to execute in your SQL Server Management Studio for example (supported only by SQL Server 2012 and SQL Server 2014). You will find a…
A new functionality, introduced with SQL Server 2014, enables to store data files from a SQL Server database in Windows Azure Storage. In this posting, I will show how it works. Accessing Azure Storage The Azure Storage account is named “dbiservices”, and is composed of the “datafiles” container. This container does not contain blobs yet. If you are not…
Les vidéos des sessions des journées SQL Server 2014 sont enfin en ligne: > Infrastructure et AlwaysOn > Industrialisation des audits (avec Sarah Bessard) Si vous avez des questions n’hésitez pas à me contacter par email ou par le biais des commentaires sur ce blog. Bon visionnage! By David Barbarin
By Franck Pachot . I’ll present here 3 ways to run a query for each result of another query. Let’s take an exemple: get all executions plan (select from dbms_xplan.display_cursor) for each of my queries (identified from v$sql). The 90’s way was to run the first query, which generates the second queries into a spool file, and execute that file.…
By Franck Pachot . If we don’t mind about loosing our changes, then can we disable logging for DML? This is a question I’ve heard a lot. Ok, you don’t need to recover your changes but Oracle may want to recover the consistency of its datafiles anyway. And that’s why datafiles blocks changed though the buffer cache always generate redo.…
Un billet en cette fin d’année qui approche à grand pas pour vous annoncer la sortie prochaine (fin décembre 2014) du livre SQL Server 2014 : Développer et administrer pour la performance en français et auquel j’ai eu l’immense plaisir de participer avec Frédéric Brouard (alias SQLPro – MVP SQL Server), Nicolas Souquet (alias Elsuket – MVP SQL Server) et…
