Topic: Performance & Tuning >> Rollback monitoring
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| Title: Rollback monitoring |
| vraahul |
Posted: Jan 06, 2003 03:26:00 PM |
Total Post: 2
Joined: Jan, 2003
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Hi Guys,
Can you please provide me a rollback segment monitoring script?
Thanks,
David
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 Vegeta |
| Posted: Jan 15, 2003 11:06:00 PM |  |
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Total Post: 3
Joined: Jan, 2003
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I use this script to monitor rollback segment.
column "Hit Ratio" format 999.99
select name "Rollback Segment" ,writes,waits,gets,(100-(waits/gets)) "Hit Ratio"
from v$rollstat a,v$rollname b
where (a.usn=b.usn);
Look for the waits.
Tony.
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| parthokonar |
| Posted: Sep 26, 2007 12:35:31 PM | |
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Total Post: 27
Joined: Sep, 2007
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set serveroutput on
set feedback off
prompt
prompt Looking for transactions that are rolling back ...
prompt
declare
cursor tx is
select
s.username,
t.xidusn,
t.xidslot,
t.xidsqn,
x.ktuxesiz
from
sys.x_$ktuxe x,
sys.v_$transaction t,
sys.v_$session s
where
x.inst_id = userenv('Instance') and
x.ktuxesta = 'ACTIVE' and
x.ktuxesiz > 1 and
t.xidusn = x.ktuxeusn and
t.xidslot = x.ktuxeslt and
t.xidsqn = x.ktuxesqn and
s.saddr = t.ses_addr;
user_name varchar2(30);
xid_usn number;
xid_slot number;
xid_sqn number;
used_ublk1 number;
used_ublk2 number;
begin
open tx;
loop
fetch tx into user_name, xid_usn, xid_slot, xid_sqn, used_ublk1;
exit when tx%notfound;
if tx%rowcount = 1
then
sys.dbms_lock.sleep(10);
end if;
select
sum(ktuxesiz)
into
used_ublk2
from
sys.x_$ktuxe
where
inst_id = userenv('Instance') and
ktuxeusn = xid_usn and
ktuxeslt = xid_slot and
ktuxesqn = xid_sqn and
ktuxesta = 'ACTIVE';
if used_ublk2 < used_ublk1
then
sys.dbms_output.put_line(
user_name ||
'''s transaction ' ||
xid_usn || '.' ||
xid_slot || '.' ||
xid_sqn ||
' will finish rolling back at approximately ' ||
to_char(
sysdate + used_ublk2 / (used_ublk1 - used_ublk2) / 6 / 60 / 24,
'HH24:MI:SS DD-MON-YYYY'
)
);
end if;
end loop;
if user_name is null
then
sys.dbms_output.put_line('No transactions appear to be rolling back.');
end if;
end;
/
prompt
@restore_sqlplus_settings
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