Re: Calculating new PCTFREE and PCTUSED !!!!!1

Charlie,

Do you check 'table fetch continued row' stats before doing so?

If you're not waiting on chained rows, or the waits are negligible, why bother?

Jared

On Friday 17 January 2003 13:56, Charlie_Mengler_at_HomeDepot.com wrote:
> What I've done, is I have some PL/SQL code which looks for chained rows.
> When the number of chained rows exceeds 5% it proceeds to unchain the rows.
> Upon completion it increases the PCTFREE by 5% & decrease PCTUSED by 5%.
> This process continues until they reach values which don't induce chaining.
> This process runs once a month after our month-end processing completes.
>
>
>
>
> DENNIS WILLIAMS
> <DWILLIAMS_at_LIFETO To: Multiple
> recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> UCH.COM>
> cc:
> Sent by: Subject: RE: Calculating
> new PCTFREE and PCTUSED !!!!!1 root_at_fatcity.com
>
>
> 01/17/2003 01:04
> PM
> Please respond to
> ORACLE-L
>
>
>
>
>
>
> Reddy - No I have not used that script. But most of Don's stuff is quite
> good. I thought it might illuminate some issues for you. Sorry if it didn't
> help.
> The PCTFREE and PCTUSED parameters mainly need tweaked when your data is
> volatile, when existing rows are updated with additional data. Is your data
> very volatile?
>
> Dennis Williams
> DBA, 40%OCP
> Lifetouch, Inc.
> dwilliams_at_lifetouch.com
>
>
> -----Original Message-----
> Sent: Friday, January 17, 2003 12:50 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Dennis,
>
> Have you used the script ??
>
> I have gone thru the material u have pointed , also executed the script in
> it, but it doesn't make any sense to me . Performance is the issue for me
> not the SPACE .
>
> here is the script:
>
> - pctused.sql
> - © 1999 by Donald Keith Burleson
> set heading off;
> set pages 9999;
> set feedback off;
>
> spool pctused.lst;
>
> define spare_rows = 2;
>
> define blksz = 4096; ( I used 8192 )
>
> select
> ' alter table '||owner||'.'||table_name||
> ' pctused '||least(round(100-((&spare_rows*avg_row_len)/(&blksz/10))),95)||
> ' '||
> ' pctfree '||greatest(round((&spare_rows*avg_row_len)/(&blksz/10)),5)||
> ';'
> from
> dba_tables
> where
> avg_row_len > 1
> and
> avg_row_len < 2000
> and
> table_name not in
> (select table_name from dba_tab_columns b
> where
> data_type in ('RAW','LONG RAW')
> )
> order by owner, table_name
> ;
>
> spool off;
>
> Sample o/p: alter table <schema>.TSFDETAIL pctused 95 pctfree 5;
>
> And previous value for PCTFREE is 20 and the chained rows are 1054757 in
> that table..
>
>
>
> Does anyone have good idea to calculate PCTFREE would like to share with me
> ???
>
>
> I need help !!!
>
> Thanks
> Madhu
>
>
>
> -----Original Message-----
> Sent: Wednesday, January 15, 2003 3:26 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Madhu
> Here is a good article that discusses the various aspects:
> http://www.dba-oracle.com/art_pctfree.htm
>
> Dennis Williams
> DBA, 40%OCP
> Lifetouch, Inc.
> dwilliams_at_lifetouch.com
>
>
> -----Original Message-----
> Sent: Wednesday, January 15, 2003 3:06 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Hello All,
> I have found some of the tables are heavily chained in one of the database
> .
> I want to fix them by exp and imp, but before that I would like to have a
> formula or some better method to identify the new PCTFREE and PCTUSED for
> each individual table.
>
> Many of you have might have done this in the past , would you pl share your
> ideas on this ??
>
> Thanks in advance,
> Madhu
>
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> INET: Madhusudana.Reddy_at_bestbuy.com
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