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August 2018

Visual Studio- All the Warm and Fuzzy

So I haven’t opened Visual Studio in….oh….let’s just say it’s been a few years…:)

I had a project that I needed to run and was surprised when the Solution Explorer was missing from SSMS 2017.  Its only fair to say, there was also fair warning from Microsoft.

Oracle 18c preinstall RPM on RedHat RHEL

By Franck Pachot

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The Linux prerequisites for Oracle Database are all documented but using the pre-install rpm makes all things easier. Before 18c, this was easy on Oracle Enterprise Linux (OEL) but not so easy on RedHat (RHEL) where the .rpm had many dependencies on OEL and UEK.
Now that 18c is there to download, there’s also the 18c preinstall rpm and the good news is that it can be run also on RHEL without modification.

This came to my attention on Twitter:

RAC One node databases are relocated by opatchauto in 12.2 part 2

In a previous post I shared how I found out that RAC One Node databases are relocated on-line during patching and I promised a few more tests and sharing of implications. If you aren’t familiar with RAC One Node I recommend having a look at the official documentation: The Real Application Clusters Administration and Deployment Guide features it prominently in the introduction. One of the things I like to keep in mind when working with RAC One Node is this, quoting from section 1.3 in said admin and deployment guide:

Building community via the speaker community

I recently participated in the Oracle Developer Community Yatra tour throughout India. It is a hectic event with 7 cities covered in a mere 9 days, so you can imagine how frantic the pace was. A typical day would be:

  • 7am – breakfast
  • 8am – check out of hotel and leave for the venue
  • 9am – speak all day, host Q&A
  • 6pm – leave straight from venue to the airport
  • 8pm – dinner at airport, and fly to next city
  • 1am – get to next hotel, grab some sleep before doing it all again in 6 hours time

Yet as a speaker in this event, it never felt that the logistics of the event were out of control.  This is mainly due to the incredible work of the people in the AIOUG (All India Oracle User Group) coordinated by Sai Penumuru. The smoothness of the organization prompted me to blog about how user groups could follow the AIOUG lead in terms of running successful events.

Extended Histograms – 2

Following on from the previous posting which raised the idea of faking a frequency histogram for a column group (extended stats), this is just a brief demonstration of how you can do this. It’s really only a minor variation of something I’ve published before, but it shows how you can use a query to generate a set of values for the histogram and it pulls in a detail about how Oracle generates and stores column group values.

We’ll start with the same table as we had before – two columns which hold only the combinations (‘Y’, ‘N’) or (‘N’, ‘Y’) in a very skewed way, with a requirement to ensure that the optimizer provides an estimate of 1 if a user queries for (‘N’,’N’) … and I’m going to go the extra mile and create a histogram that does the same when the query is for the final possible combination of (‘Y’,’Y’).

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