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Re: Tips/Hacks to create minial DB from the execution of several (simple) SQL requests.

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Hi Scott!

The problem is that my test database has several tables with many links between them, so I have no idea which 1000 rows to get from which table. The only thing I can do is run the program that connects to that database and tell it to run on a sample of the database.

I can get a log of all the queries that are executed, but I was wondering if there was a more general solution where I could use a "modified/hacked" postgres driver and catch all the rows of all the tables that were accessed during those queries.

I could then simply insert them into the test database and in theory my program should run the same if I used it instead of the real one (assuming its configure to run on the same sample).

Daniel Shane

>>>QUOTE
I'd create a test schema, set the search path on your test user to just 
that schema. And you could create the tables something like so:

CREATE TABLE test.foo AS
   SELECT * FROM public.foo
   LIMIT 1000;

Scott
<<<QUOTE

Daniel Shane wrote:
> Hi all!
> 
> I have an interesting problem here that I think could be of interest to everyone. I in the process of writing test cases for our applications and there is one problem I am facing. To be able to test correctly, I need to create a small database (a sample if you want) from a very large one so that I can run some tests on a subset of the data. 
> 
> Sometimes you are asked to do this but know nothing about the database in advance (ugh!).
> 
> I could create several queries and build it myself by trial and error, but I was wondering if a more general approach could be elaborated.
>
> ... 


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