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Redo Logs Question

From: Tom Schruefer <tschruefer_at_mail.howard.k12.md.us>
Date: Mon, 31 Dec 2001 07:52:23 -0800
Message-ID: <F001.003E475C.20011231072022@fatcity.com>

Here is the background of the stiuation I am facing.

We are piloting a application that uses a hybred store and forward system to aggregate all of our disparate student data into one central database. Currently there are 20 schools integrated into the system with another 48 to go, those 20 schools hold about half of our 46k student population.

The system allows (requires) student demographics to be entered through a web client, while grades, attendance, health, conduct, etc. are uploaded over night.

The system comes with the redo log file size set to 5k, which when the users in the 20 pilot schools get going causes a log switch about every 90 seconds. In my limited, steep learning curve expereince, this does not seem like a good thing. Add to that, they cancelled the Oracle Tuning class, which I have to wait until the system is in to take now.

So my questions (that the books don't really seem to want to answer):

How frequently should redo log file switches occur?

How large should my redo logs be?

I am guessing the answer to both of these questions is, It Depends. So my question really is, how do I determine what the correct settings for my installation are?

Tom

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Author: Tom Schruefer
  INET: tschruefer_at_mail.howard.k12.md.us

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