An overview of AWR , ASH and ADDMPresentations/... · •Ensure you have enough SYSAUX tablespace...
Transcript of An overview of AWR , ASH and ADDMPresentations/... · •Ensure you have enough SYSAUX tablespace...
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An overview of AWR , ASH and ADDM
Scott Black2/23/2011DBA SIG
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Learning About AWR
Real-World Performance Day with Tom Kyte
The Independent Oracle Users Groups presents “A Day of Real-World Performance” featuring Tom Kyte; coming to a city near you. Tom, author of the popular AskTom Blog, will be joined at this unique performance master class by
Andrew Holdsworth, head of Oracle’s Real World Performance group
Graham Wood, performance architect at Oracle and the father of ASH and AWR
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Learning AWR -UTOUG
Performance Diagnosis with Custom ASH and AWR Reporting - Daniel Fink
RDBMS Forensics using ASH and AWR - Tim Gorman
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Thanks For Coming
Questions?
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AWR –Automatic Work Repository
Enhanced STATSPACK
Reports can be generated from sqlplus or browers
Data is stored from various performance views including V$SYSSTAT, V$SESSTAT and V$ACTIVE_SESSION_HISTORY
Data from AWR is used by Undo, Segment, advisors and ADDM
New features are added in major and even minor version changes
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Populating The AWR
ASH – Active Session History
Circular area of SGA memory that holds session wait information
MMON – New 10g background process that stores the ASH information in the AWR
AWR and ADDM talk with your Sales Rep about AWR license!
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ASH - Performance Graph
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ASH – Find Performance Problems
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Sql Drill Down
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Configuring AWR Snapshots
11.2 Default is snap every hour and retain for 7 days
Use either OEM or DBMS_WORKLOAD_REPOSITORY to change
BEGIN DBMS_WORKLOAD_REPOSITORY.modify_snapshot_settings(
retention => 43200,
interval => 30)
END;
Change to 30 minute snaps and keep for 30 days
Ensure you have enough space for the SYSAUX tablespace to store all the data!
STATISTICS_LEVEL should be set to typical or all
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Access AWR via OEM
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Configuring AWR Snapshots
STATISTICS_LEVEL should be set to typical or all or some stats could be missing
Setting the interval to zero turns of snapshot collection
View current snapshot settings in OEM or DBA_HIST_WR_CONTROL view
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Manual AWR Snapshot
Need create a snap shot now
EXEC DBMS_WORKLOAD_REPOSITORY.create_snapshot;
BEGIN DBMS_WORKLOAD_REPOSITORY.drop_snapshot_range ( low_snap_id => 22, high_snap_id => 32); END; /
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AWR Baselines 11g
Two snapshots that by default are retain forever that allows for performance comparison against another baseline.
3 Major types of baselines – Fixed, Moving Window, Templates
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AWR Fixed Baseline
Found in 10g but more flexible in 11gUse dates or snap ids for start and end periodsCan automatically retire baselines
DBMS_WORKLOAD_REPOSITORY.create_baseline(
start_snap_id => 2490,
end_snap_id => 2491,
baseline_name => 'test1_bl',
expiration => 60);
DBMS_WORKLOAD_REPOSITORY.create_baseline(
start_time => TO_DATE('09-JUL-2010 17:00', 'DD-MON-YYYY HH24:MI'),
end_time => TO_DATE('09-JUL-2010 18:00', 'DD-MON-YYYY HH24:MI'),
baseline_name => 'test2_bl',
expiration => NULL);
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AWR Moving Window Baselines
The last X number of days from today is the start and end of the baseline
If you want a baseline that is longer then the retention increase your retention!
SQL> SELECT moving_window_size
2 FROM dba_hist_baseline
3 WHERE baseline_type = 'MOVING_WINDOW';
MOVING_WINDOW_SIZE
------------------
7
SQL>
BEGIN DBMS_WORKLOAD_REPOSITORY.modify_snapshot_settings(
retention => 43200); -- Minutes (= 30 Days).
END; /
BEGIN DBMS_WORKLOAD_REPOSITORY.modify_baseline_window_size(
window_size => 20);
END; /
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AWR Template Baselines
Allows for creating baselines in the future
Can be a one time creation or a repeating baseline
BEGIN DBMS_WORKLOAD_REPOSITORY.create_baseline_template(
start_time => TO_DATE('01-DEC-2010 00:00', 'DD-MON-YYYY HH24:MI'),
end_time => TO_DATE('01-DEC-2010 05:00', 'DD-MON-YYYY HH24:MI'), baseline_name => '01_dec_010_00_05_bl', template_name => '01_dec_010_00_05_tp', expiration => 100);
END; /
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AWR Template Baselines
BEGIN DBMS_WORKLOAD_REPOSITORY.create_baseline_template(
day_of_week => 'MONDAY', -- Or ALL for everyday
hour_in_day => 0,
duration => 5,
start_time => SYSDATE,
end_time => ADD_MONTHS(SYSDATE, 6),
baseline_name_prefix => 'monday_morning_bl_',
template_name => 'monday_morning_tp',
expiration => NULL);
END;
/
BEGIN DBMS_WORKLOAD_REPOSITORY.drop_baseline_template
(template_name => '01_dec_008_00_05_tp');
END; /
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Using Baselines For Alerting
Different time of day may call for different warning and critical thresholdsDuring the day system is OLTP. Lots of quick queries and low response timesAt night batch processes run causing large I/O waitsUse moving system window to set the thresholds so alerts are meaningful
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ADDM
Automatic diagnostic manager that uses AWR to find performance problemsAnalysis runs every time a AWR snapshot is takenMust have stats set to typical or allThe results are stored in the AWRResults may include hardware, database, schema and application changesFor I/O analysis ADDM needs to know how fast the storage is
EXECUTE DBMS_ADVISOR.set_default_task_parameter('ADDM', 'DBIO_EXPECTED', 8000);
FINDING 1: 59% impact (944 seconds)-----------------------------------The buffer cache was undersized causing significant additional read I/O. RECOMMENDATION 1: DB Configuration, 59% benefit (944 seconds) ACTION: Increase SGA target size by increasing the value of parameter "sga_target" by 28 M. SYMPTOMS THAT LED TO THE FINDING: Wait class "User I/O" was consuming significant database time. (83% impact [1336 seconds])
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Running ADDM Report
From Sql Plus
rdbms/admin/addmrpt.sql
From OEM
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Drill Down
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Running AWR ReportFrom OEM
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Running AWR Report via SqlPlus
@$ORACLE_HOME/rdbms/admin/awrrpt.sql
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Real AWR Power, Compare Two Baselines
Use the system moving window or a saved baseline to compare bad performance to a known good performance period
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Comparing AWR Reports
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Comparing AWR Reports
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Summary
•Upgrade to 11g!•Ensure you have enough SYSAUX tablespace for retention period•Stats are set to typical or all•Look at the system moving window•Dynamic Thresholds•Save baselines for at know good performance periods•Use AWR Compare
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Thanks For Coming
Questions?