The document outlines procedures for collecting, organizing, and querying OEM (Oracle Enterprise Manager) data, focusing on metrics related to CPU, I/O, and memory usage for Oracle databases. It includes specific SQL queries to extract metrics such as maximum CPU usage, I/O metrics, and total memory usage. Key tables and data structures involved in this process are also mentioned.

1. Using SQL on OEM Data
●
OEM Data Collection
●
OEM Data Organization
●
OEM Querying

2. OEM Data Collection
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MGMT$TARGET_TYPE
●
MGMT$TARGET
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MGMT$METRIC_CATEGORIES
●
MGMT$TARGET_METRIC_COLLECTIONS

3. OEM Data Organization
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MGMT$METRIC_CURRENT
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MGMT$METRIC_HOURLY
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MGMT$METRIC_DAILY
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SYSMAN.EM_INT_PARTITIONED_TABLES
●
sysman.gc_interval_partition_mgr.set_retention('SYSMAN','EM_METRIC_VALUES_DAILY'
,60)

4. OEM Querying (CPU)
-- ----------------------------------------------------------------------
-- CPU usage
-- ----------------------------------------------------------------------
SELECT
target_name,
MAX("MAXIMUM") / 200 AS max_cores,
MIN("MINIMUM") / 200 AS min_cores,
AVG("AVERAGE") / 200 AS avg_cores
FROM
sysman.mgmt$metric_daily
WHERE
target_type = 'oracle_database'
AND
metric_column = 'max_tot_cpu_usage_ps'
GROUP BY
target_name;

5. OEM Querying (I/O)
-- ----------------------------------------------------------------------
-- I/O usage
-- ----------------------------------------------------------------------
SELECT
target_name,
rollup_timestamp,
metric_column,
"MAXIMUM"
FROM
mgmt$metric_hourly
WHERE
target_type = 'oracle_database'
AND
metric_column IN ('iombs_ps','iorequests_ps');

6. OEM Querying (Memory)
-- ----------------------------------------------------------------------
-- Maximum Memory usage
-- ----------------------------------------------------------------------
SELECT
target_name,
rollup_timestamp,
"MAXIMUM"
FROM
mgmt$metric_hourly
WHERE
target_type = 'oracle_database'
AND
metric_column = 'total_memory';

7. OEM Querying (Memory)
-- ----------------------------------------------------------------------
-- Maximum Memory usage
-- ----------------------------------------------------------------------
SELECT
target_name,
rollup_timestamp,
"MAXIMUM"
FROM
mgmt$metric_hourly
WHERE
target_type = 'oracle_database'
AND
metric_column = 'total_memory';