Re: stripes, partitions, and spindles

Let's see if I can remember a summary of our last discussion on this.

RAID 10 (mirror then stripe) is the way to go unless it's a decision support database (mostly read only) in which case RAID 5 takes fewer platters.

If you have enough spindles, I personally would treat them as disks and go with the "DBA Handbook" OFA. Try to avoid not just "disk" contention but also controller contention.

If you have a small number of users connected at any one time, make the stripe small. This will spread data over many platters and allow a single user's query to be answered by multiple heads. On the down side, it will tie up the RAID device for the duration of the data fetch. If you have a large number of users at any one time, make the stripe small. This reduces the number of heads being used to answer a single user's query and allows the RAID device to fetch data for multiple users simultaneously.

I would take the "general ledger" table and put it in its own tablespace and probably spread that tablespace across multiple spindles by using several datafiles.

I hope that this sparks a useful discussion.                                                                                             

                    Ruth                                                               
    
                    Gramolini            To:     Multiple recipients of list ORACLE-L  
    
                    <rgramolini          <ORACLE-L_at_fatcity.com>                        
    
                    @tax.state.vt        cc:                                           
    
                    .us>                 Subject:     stripes, partitions, and 
spindles    
                    Sent by: root                                                      
    
                                                                                       
    
                                                                                       
    
                    11/30/2001                                                         
    
                    07:55 AM                                                           
    
                    Please                                                             
    
                    respond to                                                         
    
                    ORACLE-L                                                           
    
                                                                                       
    
                                                                                       
    

Good morning all,

We have purchased new IBM AIX boxes and the guy whole sold them to us is here puting them together. ( He used to work for IBM.) The question rises again, do I put my tablespaces on separate spindles, e.g. Data on one, Data2
(big extents) on 2, Index1, Index2 all on separate spindles or do I stipe
everything. We are planning to partition or largest table (bottleneck) after the duhvelopers figure out how to do it.

We will have plenty of spindles for system,redo, etc.

I need some good arguments for each. I don't really think the ex-IBMer should have the final word.

We have a three-tier application which all employees use and nightly batch processing. We have two databases which run separately during the day and communicat with each other at night through db_links. Everything runs through this one huge table (it is like a general ledger).

The boss says she has run a stiped Oracle database in the past but doesn't really know if this is the best.

I will be eternally grateful for all info.

TIA,
Ruth

--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Ruth Gramolini
  INET: rgramolini_at_tax.state.vt.us

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L


(or the name of mailing list you want to be removed from).  You may

also send the HELP command for other information (like subscribing).


-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: 
  INET: tday6_at_csc.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L


(or the name of mailing list you want to be removed from).  You may

also send the HELP command for other information (like subscribing).