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SQL Server 2014: Hekaton memory optimized tables, hash indexes, and bucket counts

For my first blog post at dbi services, I think it could be a good opportunity to begin by discussing around SQL Server 2014, Hekaton memory optimized tables, and hash indexes. When you create a memory optimized table you(…)

Delayed Transaction Durability: A new feature in SQL Server 2014 CTP2

Delayed Transaction Durability is a new SQL Server 2014 feature that was not included in SQl Server 2014 CTP1 but discreetly published in CTP2. It is a very interesting functionality that helps reducing the IO contention for transaction log(…)

Oracle et Dbvisit Replicate pour migrer sans arrêt de service… et sans stress

By Franck Pachot . Je viens d’assister au Webinar Zero Downtime Migration pour Oracle, présenté par Chris Lawless qui est récemment passé de Product Manager Golden Gate à Product Manager Dbvisit.  Je vais détailler ici un point très(…)

Oracle is hanging? Don’t forget hanganalyze and systemstate!

By Franck Pachot . sqlplus / as sysdba oradebug setmypid oradebug unlimit oradebug hanganalyze 3 oradebug dump ashdumpseconds 30 oradebug dump systemstate 266 oradebug tracefile_name Your Oracle database – production DB, of course – is hanging. All users are blocked.

SQL Server 2014: Readable Secondary with In-Memory objects

In-Memory OLTP is one of the best new functionalities of SQL Server 2014 as it was the case with AlwaysOn and SQL Server 2012. In-Memory OLTP is fully integrated with AlwaysOn and also with AlwaysOn Availability Group. During my(…)

SQL Server 2014: Rebuilding Clustered Columnstore Indexes

I was surprised that you have to rebuild indexes that are stored In Memory. My previous posting “SQL Server 2014 – New Features: xVelocity memory optimized columnstore index” explains all processes connected with columnstore indexes. In this article, I(…)

Archivelog deletion policy for Standby Database in Oracle Data Guard

By Franck Pachot . Do you use ARCHIVELOG DELETION POLICY TO APPLIED ON ALL STANDBY for your Oracle databases in Data Guard? Maybe you also use the Fast Recovery Area as archive log destination. That’s good practice! But did(…)

Oracle LOBs: Infer the file type with dbms_lob package

LOBs (Large OBjects) first appeared in Oracle 7 and were created to store large amount of data such as document files, video, pictures, etc. Today, we can store up to 128 TB of data in a LOB, depending on the(…)

Oracle 12c: Applying PSU 12.1.0.1.1 with Multitenant DB & unplug/plug

The concept of Multitenant databases, which was introduced with Oracle 12c in June 2013, allows to run several databases on a single instance. Oracle presents this feature as a good solution for Oracle patching. The reason behind it is(…)

Sockets, Cores, Virtual CPU, Logical CPU, Hyper-Threading: What is a CPU nowadays?

By Franck Pachot . Because people know that I really like Oracle AWR reports, they send them to me from time to time. Here is one I have received for Christmas with the following question: ‘Since our AIX server(…)