Dennis,
My database is of size 960 Gig for now and its a heavy OLTP with high DML
activity on tables , we are observing some ORA-00600 errors these days due
to chained rows in the tables . Also we all know chained rows cause
performance issues . I wanted to fix this ASAP and also would like to alter
the PCTFREE , so I want some ideas from all of you to find out a proper
value ..
Thanks
Madhu
-----Original Message-----
Sent: Friday, January 17, 2003 3:04 PM
To: Multiple recipients of list 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.
[EMAIL PROTECTED]
-----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.
[EMAIL PROTECTED]
-----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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