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When should log events be captured in a database?

From: James Hartley <jjhartley(at)gmail(dot)com>
To: pgsql-novice(at)postgresql(dot)org
Subject: When should log events be captured in a database?
Date: 2012-01-12 00:06:06
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-novice
This is slightly off-topic, but the PostgreSQL cognoscenti is likely to be
the best audience for the question.

I am writing an application -- an application-specific (scaled down) Web
server in Node.js.  A question I keep asking myself is whether it it better
to simply log incoming requests, or write them to a database.  Ultimately,
I would like to analyze the data, so moving into a database makes sense.
However, I also can see the point of logging as a simpler, less CPU & I/O
intensive activity.  When life goes wrong, capturing data in a log file may
be the easier.  Plus, resources are freed to handle requests which is the
fundamental goal of a Web server anyways.

Yet if the database resides on another machine, this dismisses some of the
CPU - I/O load argument.

I can't believe that the frequency data is acquired is the determinant, but
I may be wrong.

I am also aware that there are various tools available for parsing log file
data into databases, & writing such tools is not altogether complicated.
Nevertheless, this seems to be a redundant exercise.

So, I come back full circle.  Even PostgreSQL itself has its log files.
Not everything is written to database tables proper.  Yet at what point
does data take on a new status such that it should be collected in a
database over simply being written to logs?

Thanks for all candor shared.


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Subject: Re: When should log events be captured in a database?
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