Database management

Oracle and Analytic Queries before In-Memory option

By Franck Pachot . Next Tuesday in Geneva I'm presenting Oracle In-Memory Column Store to Business Intelligence people at the Swiss BI Day After defining what is an analytic query, I show the different approaches to optimize that in(…)

Oracle 12c duplicate in cluster fails with ORA-65500

I had to perform a duplicate database between 2 ODAs and was always facing an ORA-65500 at the begin of the RMAN operation. Looking a bit deeper in the log outputs pointed me out that it was due to some(…)

Oracle CDC for Datawarehouse, Dbvisit replicate as an alternative

By Franck Pachot . You don't want to reload the datawarehouse database every night. And you may want to have it refreshed more often, in real-time during the day. There is another reason to capture all changes from the(…)

Oracle Database Cloud Service – DBaaS

By Franck Pachot . My first trial was not very good because I had access to Schema as a Service only. Which is not new. But Oracle Cloud Services is becoming(…)

SQL Server 2016: In-Memory OLTP enhancement

The CTP2.1 has been released for some weeks and it is time to check which interesting enhancements have been already deployed for the In-Memory OLTP feature. I will first have a look to the memory optimized table. Memory Optimized(…)

Dealing with SSRS subscription schedules in AlwaysOn environment

A couple of days ago, I had the opportunity to work with AlwaysOn 2014 infrastructure that included a report server (SSRS) in native and scale-out mode. As you know, dealing with SSRS and availability groups is not an easy task(…)

Clustered columnstore index and memory management

Few weeks ago, I had the opportunity to give a session about the clustered columnstore index feature (CCI) at our In-Memory event dedicated to In-Memory technologies for Microsoft SQL Server, Oracle and SAP HANA. During our session, I explained(…)

RESULT_CACHE hint expiration options

By Franck Pachot . The result cache is very nice when base tables are static: get the result without any buffer get, without any join or sorts. But as soon as any DML occurs on one of the tables(…)

Multitenant vs. schema based consolidation

By Franck Pachot . If you want to install multiple instances of a software, for example you host the ERP for several companies or subsidiaries, you have 3 solutions: have one database and multiple schema have multiple databases have(…)

Oracle Log Writer and Write-Ahead-Logging

By Franck Pachot . I posted a tweet with a link to a very old document – 20 years old – about ‘internals of recovery’. It’s a gem. All the complexity of the ACID mecanisms of Oracle are(…)