RE: Very high buffer gets
- From: "Nahata, Naveen (US - Glen Mills)" <nnahata@xxxxxxxxxxxx>
- To: "Stephane Faroult" <sfaroult@xxxxxxxxxxxx>
- Date: Mon, 13 Feb 2006 12:08:55 -0500
select blocks, num_rows, to_char(last_analyzed, 'DD-MON-YYYY
HH24:MI:SS')
from all_tables
where table_name in ('AQ$_QUEUE_TABLES', 'AQ$_QUEUE_TABLE_AFFINITIES',
'AQ$_QUEUES')
BLOCKS NUM_ROWS TO_CHAR(LAST_ANALYZED,'DD-
---------- ---------- --------------------------
1 61 06-FEB-2006 15:50:09
2 136 06-FEB-2006 15:51:14
1 61 06-FEB-2006 15:50:48
Naveen
-----Original Message-----
From: Stephane Faroult [mailto:sfaroult@xxxxxxxxxxxx]
Sent: Monday, February 13, 2006 12:11 PM
To: Nahata, Naveen (US - Glen Mills)
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: Very high buffer gets
High-water mark of death? If you have recently had some service
interruption and requests have accumulated into the queue, it might be
an explanation.
Stephane Faroult
Nahata, Naveen (US - Glen Mills) wrote:
>Hi All,
>
>After tracing the QMON process which was doing lots of buffer gets, I
>found this culprit. None of the three tables involved in the query have
>more than 2 blocks. I know the nested loop is iterating over the blocks
>but that should still not account for more than 200 blocks / execution.
>Why do I see such high values for buffer gets?
>
>
>
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