Comments for Life in the fast lane...

Comment on Converting IMG files to Virtual Box VDI format by zirk

zirk — Sat, 21 Nov 2009 06:50:38 +0000

thanks! it is really usefull!

Comment on Scripting within psql by Bill Karwin

Bill Karwin — Mon, 02 Nov 2009 15:27:59 +0000

It’s unfortunate that PSQL commands have those ugly backslash names. It makes it look like LaTeX code — except less readable!

Comment on Configuring SSH access for VirtualBox Guest Host by shoaibmir

shoaibmir — Wed, 07 Oct 2009 23:27:20 +0000

Eric :

Can you also state how you allow traffic to your VM? I did what you said above, however that doesn’t work. When I ping the VM, there is no response either.

Thanks.

This has to be done through port forwarding as I just mentioned in my post as well. I might have missed something as I did a very quicky howto… You can get more details at –> http://www.linux.com/community/blogs/printblog?index_php?view=article&id=38273&tmpl=component&print=1

Comment on Configuring SSH access for VirtualBox Guest Host by shoaibmir

shoaibmir — Wed, 07 Oct 2009 23:09:16 +0000

Eric :
Can you also state how you allow traffic to your VM? I did what you said above, however that doesn’t work. When I ping the VM, there is no response either.

Thanks.

Make sure you have your guest attached to Host Interface in VirtualBox network configuration? VirtualBox network configuration will default to NAT and when using NAT your guest OS will have an IP from different network which will not match to what you have on your host. If you attach your guest to host interface and assign an IP belonging to same network as your host, you'll be able to ping your guest.

Comment on Configuring SSH access for VirtualBox Guest Host by Eric

Eric — Wed, 07 Oct 2009 18:59:56 +0000

Can you also state how you allow traffic to your VM? I did what you said above, however that doesn’t work. When I ping the VM, there is no response either.

Thanks.

Comment on A quick way to change index tablespace by shoaibmir

shoaibmir — Tue, 29 Sep 2009 22:44:34 +0000

Thanks for the tip David, never thought about that. I was just looking for a very quick and hacky way to get around this but for the next time I will keep the \o option

Comment on A quick way to change index tablespace by David Fetter

David Fetter — Tue, 29 Sep 2009 20:16:06 +0000

It seems a little baroque to run this through the shell when psql can do this job by setting \o to ‘|psql’.

Comment on Row size and Btree index by shoaibmir

shoaibmir — Wed, 23 Sep 2009 13:07:12 +0000

Yes, the column in question is a text one as I mentioned in the post as well. Well most of the operations are mainly with ‘=’ and using LIKE operator which is why its good for now… but you are right with the full-text option as I mentioned in the post as well, is something we do have as a long term plan to implement for such scenarios.

Comment on Row size and Btree index by Philip Hofstetter

Philip Hofstetter — Wed, 23 Sep 2009 11:57:02 +0000

Are you sure that you really want that index there?

You see, Indexes only work for front-anchored comparisons.

So I assume that the column in question is a text column.

The only way a non-fulltext-index can be used is for queries like

clm_name = ‘term’

clm_name LIKE ‘term%’

all other variations (‘%term%’ or ‘term%’) will not be able to use your index and will cause a table scan (unless you have other limiting factors).

To only way around this limitation is to bite the bullet and hook up some kind of full-text indexing.

Comment on Finding top read tables in the database by shoaibmir

shoaibmir — Mon, 14 Sep 2009 22:50:49 +0000

Because I don’t need any rows with zero reads in my result set