Re: [Fwd: UNIX Performance Issues]

MessageJames,

Interleaved, please find my reply....

+Rahul

• Original Message ----- From: James Morle To: Multiple recipients of list ORACLE-L Sent: Tuesday, February 19, 2002 6:03 AM Subject: RE: [Fwd: UNIX Performance Issues]

  Rahul,

  Did you get a response on this? I'm not sure I fully understand the actual question - are you looking for specific commands you need to run to get the information, [Rahul] Yes. I would like to know which flags of the commonly used commands give good information. For general System stats, I use "sar -u" (same as default), for Memory / Virtual Memory I use "vmstat" and look for "r b w swap free pi po us sy id" columns. I am looking for general monitoring. And once we have this general information giving a overall picture, we could know if there is a problem and we could investigate further. I am specifically looking for IO and Network statistics. Is there any command which would give me approx IO of the system, say in last 5 minutes or current?
How to get network statistics? I was littlebit confused with netstat. There are two main categories in my output : hme0 and Total. What does that mean?

    input hme0 output input (Total) output packets errs packets errs colls packets errs packets errs colls

5757291 0     2447690 0     0      6071152 0     2761551 0     0
45      0     1       0     0      45      0     1       0     0
24      0     2       0     0      24      0     2       0     0

What I plan to do is to take snapshot of all these statistics at a certain frequency and put it in database. Later on I could generate reports based on this. Currently, I have a lot of "Camera"s like this taking snapshots of my system. Others involve Oracle stuff like DB Size Growth, Performance Ratios, UNIX File System usage, Replication Statistics, Growth of DB objects, a lot of monitors for application info (e.g. total # of clients, # of invoices generated per day). I generate trends based on this archival data for capacity planning and proactively anticipating chronic problems.
  or advice on how to interpret it? Don't forget that you will really need to correlate many of these   statistics to the Oracle pathology at the same time. You said it! I want co-relation of Application Load, UNIX System Load and Database Statistics. And not just when the problem arises. So, that's what I am trying to develop.

  This then causes a problem because your sample points will at the very least experience clock drift and become harder to compare over time. There are ways to solve it, though.   Anyway, if you could elaborate a little, I can try to assist!   Regards

  James
  --
  James Morle
  Scale Abilities, Ltd
  http://www.scaleabilities.co.uk
  Author of "Scaling Oracle8i - Building Highly Scalable OLTP System Architectures"

    -----Original Message-----
    From: Mogens Nørgaard [mailto:mln_at_miracleas.dk]     Sent: 18 February 2002 22:11
    To: James Morle
    Subject: [Fwd: UNIX Performance Issues]

    Hi James,

    I've got no idea whether this is of interest or not to you, but you probably know a bit about this topic.

    Mogens

• Original Message -------- Subject: UNIX Performance Issues Date: Thu, 14 Feb 2002 07:43:26 -0800 From: "Rahul Dandekar" <rvd_oracle_at_hotmail.com> Reply-To: ORACLE-L_at_fatcity.com Organization: Fat City Network Services, San Diego, California To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>

DBAs,

This might be littlebit (or completely!) UNIX related... But I am told to do the performance analysis of some 10-15 machines and generate some statistical data to find out bottlenecks and identify areas of tuning...

Operating System : Solaris 2.6

I have been using sar, iostat, top...
I actually plan to script these things and run these scripts at certain intervals and put the data in database (Oracle 8i) and then do the crunching...
Inputs are appreciated...

1. I/O What is current I/O status. Is there a lot of I/O going on?
2. Paging Is there lot of swapping / paging happening? Which processes are getting swapped in/out continuously? Are the I/O waits due to swapping / paging or regular stuff like DB waiting to read from DB files?
3. CPU What is the CPU utulization? Which processes are using lot of CPU?
4. Memory What is the current picture of Real and Virtual Memory? What processes are using how much memory? Which processes are i n real memory and which are in virtual memory? Which processes are swapped in and out from/to real/virtual memory and how many times?
5. Network What is the percentage utilization of network pipe? What is the capacity (bandwidth) of the network device? What percentage of that bandwidth is getting used? Is the system waiting for data from outside network I/O? In short, is there any bandwidth problem with network device or network traffic.

Thanks,

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-- 
Author: Rahul Dandekar
  INET: rvd_oracle_at_hotmail.com

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