Hi ,
TOAD gives this alarm often. what does it mean ? which view will
give me the wait statistics ?
Answer :
======
Please run STATSPACK to if this is one of the top waitevents to
check if the percentage of wait - can be treated as problematic one
SELECT p1 "File", p2 "Block", p3 "Reason"
FROM v$session_wait
WHERE event='buffer busy waits'
Repeatedly run the above statement and collect the output. After a period
of time sort the results to see which file & blocks are showing
contention:
" it occurs when a session cannot access a block because it is in
use by another session. The two most common causes are
insufficient free lists for a table or insufficient rollback
segments. " --- IS THIS THE REASON ?
Answer:
======
Yes on top of the wait event could also occur
could also occur if
a. if the application is going against a set of same blocks (hot blocks)
Thanks,
Kavi
oraora oraora wrote:
> Guys,
>
> " Buffer busy waits are 10.96% of non-idle waits "
>
> TOAD gives this alarm often. what does it mean ? which view will
> give me the wait statistics ?
>
> " it occurs when a session cannot access a block because it is in
> use by another session. The two most common causes are
> insufficient free lists for a table or insufficient rollback
> segments. " --- IS THIS THE REASON ?
>
> what should be the value of this , i mean , the safe limits ?
>
> How do i approach and solve this issue ?
> kindly enlighten me.
>
> TIA.
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