dbi services Blog
Welcome to the dbi services Blog! This IT blog focuses on database, middleware, and OS technologies such as Oracle, Microsoft SQL Server & SharePoint, EMC Documentum, MySQL, PostgreSQL, Sybase, Unix/Linux, etc. The dbi services blog represents the view of our consultants, not necessarily that of dbi services. Feel free to comment on our blog postings.
A couple of days ago, I faced a weird backup issue with SQL Server AlwaysOn and availability groups at one of my customer (thank to him to point out this issue :-) ). After installing our DMK tool (Database Management Kit) about database maintenance for AlwaysOn, my customer noticed that their databases have not backed up. Ouch … what’s going on? I never ran into this issue before... Do the problem comes from our tool?
The next version of Windows will provide some interesting features about WFSC architectures. One of them is the new quorum type: "Node majority and cloud witness" which will solve many cases where a third datacenter is mandatory and missing to achieve a truly resilient quorum.
This week, Tom Kyte, Graham Wood and Andrew Holdsworth were present in Europe for several dates. One of the events was organised by the Austrian Oracle User Group (AOUG) in collaboration with the German and Swiss User Group (DOAG and SOUG) and I had the chance to be there to attend to one session of the Real Worl Performance tour session in Vienna.
The Oracle Database Appliance is really interresting for small enterprises. It's very good hardware for very good price. It's capacity on demand licensing for Enteprise Edition. But small companies usually go to Standard Edition for cost reasons.
Then does it make sense to propose only Enterprise Edition to the small companies that are interrested by ODA?
In a previous blog entry, I started to share some Tips & Tricks about the installation and configuration of some QlikView components/software. I will try to complete this list with some other interesting things to know. On this blog entry, I will try to explain how to enable the Task Performance Summary, to debug or at least enable the Communication with Salesforce and how to install the QlikView Management Console Connector (QlikView Management API).
This new feature has been introduced in SQL Server 2012 and needs an Enterprise Edition. It uses a Windows Service which scans Oracle Logs and tracks DML changes from Oracle tables into SQL Server change tables.
In other words, Change data capture records Insert, Update and Delete activities that is applied to Oracle tables.
Let's see how it works.
Last night, I had an interesting discussion with one of my MVP French friend that faces a weird situation where a query that uses a statement level RECOMPILE hint produces an execution plan that disappointed him. He told me we can simulate the same situation by using the AdventureWorks database and Sales.SalesOrderHeader table.
In our more and more connected world, security is a big concern. Storing password is a very important topic because if a machine is compromised, we can assume that any password stored in clear text are also compromised. I had the question from a customer how can we encrypt the password in our application and monitoring scripts? In this blog we will discuss one solution: using the Oracle client wallet
Sometimes we have to index on ( trunc(date) ) because a SQL statement uses predicate on it instead of giving a range from midnight to midnight. When you do that you probably keep the index on the column. That's two indexes to maintain for DML. Do we need it?