How does AWR contributes data for ADDM.

Hi,
In oracle10g I understand that AWR is used to get information for ADDM.
I am looking for a detail explanation as how its doing that and How ORACLE is handling the data and deciding the recommendation.
Regards
MMU

Hi,
I am looking for a detail explanation as how its doing that and How ORACLE is handling the dataAs I understand it, the data for AWR is collected exactly the same as a STATSPACK snapshot, copying the contents of the in-memory accumulators (as exposed by the x$ fixed tables).
When you take an AWR snapshot, your collection threshold settings determine the volume of data collected, especially SQL. The snapshot thresholds only apply to the SQL statements that are captured in the stats$sql_summary table. The stats$sql_summary table can easily become the largest tables in the STATSPACK schema because each snapshot might collect several hundred rows, one for each SQL statement that was in the library cache at the time of the snapshot.
In the Automatic Workload Repository (AWR), the executions_th , parse_calls_th , disk_read_th , buffer_gets_th , sharable_mem_th , and version_count_th SQL collection threshold settings allow the DBA to set thresholds for SQL statements. If any of the thresholds are exceeded, the information will be stored by STATSPACK in the repository.
http://www.dba-oracle.com/tips_oracle_statspack_snapshot_thresholds.htm
How ORACLE is handling the data and deciding the recommendation.That's a closely-held secret, a proprietary feature that Oracle will never expose!
Hope this helps. . . .
Donald K. Burleson
Author of "Oracle Tuning: The Definitive Reference"
http://www.rampant-books.com/t_oracle_tuning_book.htm

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CREATE TABLE #Tickets (
TicketNo VARCHAR(4)
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GO
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VALUES (
'44BS'
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INSERT INTO #Tickets
VALUES (
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INSERT INTO #Tickets
VALUES (
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INSERT INTO #Tickets
VALUES (
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GO
GO
SELECT *
FROM #Tickets
GO
GO
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GO
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BEGIN
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END
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END
GO
SELECT *
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GO
GO
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GO
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<If the post was helpful mark as 'Helpful' and if the post answered your query, mark as 'Answered'>

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