Primary index vs clustered vs non clustered vs secondary index

I am new to ETL testing and dB environment.Some say PI is clustered index some say it is not. Even I found some where that secondary index is non clustered index. What is actually primary index and secondary index? When do we need primary index and when we need secondary index? If PI index and clustered index are different then how are they different?

Does a country code secondary domain (such as have lower ranking than a ccTLD (such as .nl) with content specific for that country?

I know that search engines like Google value more country code top level domains (ccTLD) on content that is specific to residents living in said countries, that is, the website hosted at and whose content is specific for Dutch visitors has a higher rank than

And what about Does this example is negatively affected in contrast to

Wamp Server Secondary Folder

I have an Apache Web Server running with Wamp 64bit on Windows 7, and I wanted to know if there is any way to add a secondary Serve folder on another Drive using the same port but as a subfolder like with DocumentRoot S:/public while the first one is on the default C:/wamp64/www

I can’t find anything useful online, so I dont know where to start

Best way to indicate secondary list items within an expandable list will lead to a new screen? iOS mobile app

I’m designing a page with an accordion list (not a sidebar menu) in a financial iOS app. I’m trying show that eacg primary list item is expandable/collapsible (indicated by up-down chevrons), and that secondary items within each primary list item will lead to a new page (indicated by right chevrons).

This is what the list looks like collapsed: List Collapsed

And expanded:

List Expanded

Is having a mix of so many chevrons confusing and cluttered? What’s the clearest way to display this?

Having my user folders symlinked to my secondary 2tb hard drive is causing my computer to lock up

Having my user folders (Downloads, Pictures, Videos, Documents) to my secondarey 2tb hard drive is causing my computer to lock up and the cpu usage spikes to 100% also a tracker-extraction procsess going on the uses a lot of CPU.

The system is semi usable after this happens but some apps frezze and won’t open for example Nautilus. Trying to run it from the command line gives me and error about timeout reached

18.04 Secondary Monitor on left not receiving signal

N00B here:

I have a Dell XPS 15 running stock ubuntu 18.04 I have a secondary monitor which is my old Sony KDL-32XBR6

Attaching the second monitor works fine IF I leave the Secondary monitor on the right of my laptop in Display Settings. However, if I move it to the left, then the Sony tells me No Signal.

Issues I have noticed:
1 – Ubuntu tells me I have a Sony 72″ – How can I change that? 2 – It doesn’t matter if the Sony or the Laptop are set as Primary 3 – Occasionally the green “Apply” button in Display settings will disappear so I can check every resolution to make sure that it isn’t a resolution issue.

Any help gratefully received.

Secondary display in dual display system not being used

After a recent reinstall of Ubuntu to get full system encryption working, I haven’t been able to get my secondary display to work. I think it did when I first installed using an 18.03 install iso I had. But, when I updated using apt, it just hasn’t worked since. My system: Asus Crosshair VII Hero motherboard, AMD Ryzen 7 2700X, Asus Geforce GTX 1060 graphics, 32GB DDR4-3200 G.Skill memory, HP EX920 1TB M.2 boot drive, 3TB WD Green data drive.

I have run nvidia-xconfig. Still no luck in activating the secondary display.