  | 
 IDS Forum
 RE: Index extents    
 Posted By: Rajib Sarkar  Date: Wednesday, 20 August 2003, at 11:01 a.m.
In Response To: RE: Index extents    (Stephanie_Peltier@txnp.uscourts.gov)
  
 
 
  Actually, as someone pointed out ...the size of the extent of the indexes are calculated based on the first extent of the table ....
  I had posted the calculation earlier in the same group long back ... here it is again ...
  Extentsize = Initial Extent Size of Table * ((keysize + 9 bytes (for detached) or 5 bytes (for attached)) / <table rowsize>)
  If it is a Non-Unique Index the Extentsize is reduced by 20% with the calculation , Extentsize *= 0.8;
  The function to return the extentsize returns the MAX(Extentsize, 4 pages).
  That's why when you migrate from 7.x --> 9.x suddenly you see much more space being used ..since this calculation is done for FULLY DETACHED indexes and in 9.x the indexes are detached by default. That's why when you do a DBEXPORT/DBIMPORT of a database, it is important to look into the INITIAL EXTENTSIZE of the table ..if you don't really require a huge INITIAL EXTENTSIZE it is better to reduce it since the EXTENTSIZE will not only affect the TABLE extent allocation but the INDEX extent allocation as well ...:-)
 
  Thanx much,
  Rajib Sarkar Advisory Software Engineer (RAS) IBM Data Management Group Ph :  (602)-217-2100 Fax:  (602)-217-2100 T/L : 667-2100
  As long as you derive inner help and comfort from anything, keep it -- Mahatma Gandhi
 
                                                                                                                                                                         "Stephanie_P...."                                                                                                                                <Stephanie_Peltier@txnp.us        To:       ids@iiug.org                                                                                         courts.gov>                       cc:                                                                                                            Sent by:                          Subject:  RE: Index extents    [1730]                                                                          forum.subscriber@iiug.org                                                                                                                                                                                                                                                                                                                                                                                                                          08/20/2003 07:12 AM                                                                                                                                                                                                                                                        
 
 
 
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  Actually, the extent size for indexes is not the same as the table, but is based on the field size(s) of the columns included in the index.  This is automatically calculated by Informix and cannot be set.
 
 
 
 
 
  "NormaJean.S...." <NormaJean.Sebastian@tellabs.com> Sent by: forum.subscriber@iiug.org 08/20/2003 07:51 AM
 
          To:     ids@iiug.org         cc:         Subject:        RE: Index extents   [1728]
 
  Kevin,
  I believe even on detached indices, the extent size while be the same extent size as the table and all the usual rules apply.... if it can't get the whole extent size (be it 1st extent or next), it will take what it can get... if it needs more, it'll get another extent. if it can, it will concatenate extents that are contiguous.....
  but I could be wrong (I'm on 7, not 9), it should be in the admin books, or others may confirm with answers.
  Norma Jean
 
  -----Original Message----- From: kevinstruckhoff@yahoo.com [mailto:kevinstruckhoff@yahoo.com] Sent: Tuesday, August 19, 2003 5:24 PM To: ids@iiug.org; forum.subscriber@iiug.org Subject: Index extents [1725]
 
  Using IDS 9.30FC2 on an HP-UX 11.0 box.
  in creating detached indexes, I have noticed that sometimes the index has multiple extents in a particular dbspace. For example:
  prddwh:'dw_admin'.fl_keylinks                                   943776 40 prddwh:'dw_admin'.fl_keylinks_n1                                139338 8 prddwh:'dw_admin'.fl_keylinks_n1                                148623 8 prddwh:'dw_admin'.fl_shipto                                     943592 24 prddwh:'dw_admin'.fl_shipto_n1                                  994962 4 prddwh:'dw_admin'.fl_shipto_n1                                   58472 4
 
  The index 'fl_keylinks_n1' and 'fl_shipto_n1' are split into 2 extents. I know I can't set the extent size as I can a table.
  Is it advantageous to split them up? I'm not sure what logic is used in determining where and how large the index extent should be. It looks as though it finds the first available opening in the dbspace and uses it. If it doesn't all fit there, look for the next available opening. Hmmm...
  TIA,
  Kevin Struckhoff Yamaha Motors U.S. kevin_struckhoff@yamaha-motor.com
  kevin_
 
 
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  <br><font size=2 face="sans-serif">Actually, the extent size for indexes is not the same as the table, but is based on the field size(s) of the columns included in the index.  This is automatically calculated by Informix and cannot be set.</font> <br><font size=2 face="sans-serif"><br> </font><img src=cid:_1_013000005928004DB9CC86256D88> <br> <br> <br> <table width=100%> <tr valign=top> <td> <td><font size=1 face="sans-serif"><b>"NormaJean.S...." <NormaJean.Sebastian@tellabs.com></b></font> <br><font size=1 face="sans-serif">Sent by: forum.subscriber@iiug.org</font> <p><font size=1 face="sans-serif">08/20/2003 07:51 AM</font> <br> <td><font size=1 face="Arial">        </font> <br><font size=1 face="sans-serif">        To:        ids@iiug.org</font> <br><font size=1 face="sans-serif">        cc:        </font> <br><font size=1 face="sans-serif">        Subject:        RE: Index extents   [1728]</font></table> <br> <br> <br><font size=2 face="Courier New">Kevin,<br> <br> I believe even on detached indices, the extent size while be the same<br> extent size as the table and all the usual rules apply....<br> if it can't get the whole extent size (be it 1st extent or next), it<br> will take what it can get... if it needs more, it'll get another extent.<br> if it can, it will concatenate extents that are contiguous.....<br> <br> but I could be wrong (I'm on 7, not 9), it should be in the admin books,<br> or others may confirm with answers.<br> <br> Norma Jean<br> <br> <br> -----Original Message-----<br> From: kevinstruckhoff@yahoo.com [mailto:kevinstruckhoff@yahoo.com]<br> Sent: Tuesday, August 19, 2003 5:24 PM<br> To: ids@iiug.org; forum.subscriber@iiug.org<br> Subject: Index extents [1725]<br> <br> <br> Using IDS 9.30FC2 on an HP-UX 11.0 box.<br> <br> in creating detached indexes, I have noticed that sometimes the index<br> has multiple extents in a particular dbspace. For example:<br> <br> prddwh:'dw_admin'.fl_keylinks                                   943776  <br> 40<br> prddwh:'dw_admin'.fl_keylinks_n1                                139338  <br> 8<br> prddwh:'dw_admin'.fl_keylinks_n1                                148623  <br> 8<br> prddwh:'dw_admin'.fl_shipto                                     943592  <br> 24<br> prddwh:'dw_admin'.fl_shipto_n1                                  994962  <br> 4<br> prddwh:'dw_admin'.fl_shipto_n1                                   58472  <br> 4<br> <br> <br> The index 'fl_keylinks_n1' and 'fl_shipto_n1' are split into 2 extents.<br> I know I can't set the extent size as I can a table. <br> <br> Is it advantageous to split them up? I'm not sure what logic is used in<br> determining where and how large the index extent should be. It looks as<br> though it finds the first available opening in the dbspace and uses it.<br> If it doesn't all fit there, look for the next available opening.<br> Hmmm...<br> <br> TIA,<br> <br> Kevin Struckhoff<br> Yamaha Motors U.S.<br> kevin_struckhoff@yamaha-motor.com<br> <br> kevin_<br> <br> <br> <br> --openmail-part-40e4b3f6-00000002<br> Content-Type: application/rtf<br> Content-Disposition: attachment; filename="BDY.RTF"<br>                  ;Creation-Date="Wed, 20 Aug 2003 07:48:56 -0500"<br> Content-Transfer-Encoding: base64<br> <br> e1xydGYxXGFuc2lcYW5zaWNwZzEyNTJcZnJvbXRleHQgXGRlZmYwe1xmb250dGJsDQp7XGYw<br>
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Messages In This Thread
 - Index extents 
 KEVIN STRUCKHOFF -- Tuesday, 19 August 2003, at 6:24 p.m.
- RE: Index extents  
 NormaJean.Sebastian@tellabs.com -- Wednesday, 20 August 2003, at 8:51 a.m.
- RE: Index extents   
 Stephanie_Peltier@txnp.uscourts.gov -- Wednesday, 20 August 2003, at 10:12 a.m.
- RE: Index extents    
 Rajib Sarkar  -- Wednesday, 20 August 2003, at 11:01 a.m.
  
  
 - RE: Index extents   
 John Carlson  -- Wednesday, 20 August 2003, at 9:35 a.m.
 - Re: Index extents  
 ART KAGEL, BLOOMBERG/ 65E 55TH -- Wednesday, 20 August 2003, at 10:43 a.m.
  
  
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