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Using the official PostgreSQL yum repositories

Usually I advice to build PostgreSQL from source as it gives the most flexibility. Another option is to use the official yum repositories. There is one repository for each supported release of PostgreSQL and(…)

OFE – Optimizer Features Enable

By Franck Pachot . Do you know the optimizer_features_enable parameter? What do you think about it? Good or bad to use it? If I tell you to set optimizer_features_enable parameter=11.2.0.4 when you upgrade to 12c, do you think it's a(…)

Execution Plan with ASH

By Franck Pachot . Here is a query I use when I'm on a system that has Diagnostic Pack (ASH) but no tuning Pack (SQL Monitor). It displays the execution plan with dbms_xplan.display_cursor and adds the % of ASH samples(…)

SQL Server AlwaysOn and availability groups : session timeout parameter

Have you ever faced to timeout issues with SQL Server availability groups? If you take a look at the timeout parameters for an availability group, you will find a plenty of configuration settings. Indeed, you have timeout parameters(…)

DataPump ‘Processing object type’ misleading messages

By Franck Pachot . You've started a long DataPump and see it stuck on TABLE/STATISTICS/TABLE_STATISTICS, but you don't expect that step to take a long time. Let's see if we can rely on that message.

About SSH keys in Oracle Public Cloud

When working with resources on the Oracle public cloud, whatever it is IaaS or PaaS, the principle access method is based on SSH keys exchange. Once our instance is created this is going to be the first and only way(…)

Launching a VM with the Amazon AWS command line tools

The cool thing with Amazon AWS is that you can use command line tools on your workstation to bring up and manage your services. In this post I’ll look into how you can launch a Linux VM from(…)

External tables in PostgreSQL?

In Oracle you can use the external table feature to load data from files into the database. The traditional way to do this in PostgreSQL is to use the copy command. But there is(…)

SQL Server Tips: Default trace enabled but no file is active…

I discover a strange error with a customer about the default trace. As you know, SQL Server has a default trace with a lot of events like the data and log file growth. This trace is enabled by default and(…)

Availability groups : readable secondary replicas and impact on the storage layer

Do read-only capabilities of an availability group have a performance impact for databases? The quick response is yes but let’s see why in this blog post. First of all, when we want to use our secondary replicas as read-only, we(…)