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AWR and ASH in an EM12c World
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Database 12c New AWR, ASH and ADDM Features Using EM12c and Beyond Oracle Confidential 3 Kellyn Pot’Vin-Gorman, Consulting Member of Technical Team, Strategic Customer Program September, 2015
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Safe Harbor Statement The following is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle’s products remains at the sole discretion of Oracle.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. |
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Stay on the Path… • Optimization- Tune for Time or You’re Wasting Time. • Know your goal(s) • Set a stopping point, avoid OTD, (Obsessive Tuning Disorder) • Do NOT assume. Always do the research and have data behind findings.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Brief History • ASH= Active Session History • AWR= Automatic Workload Repository • Introduced in Oracle 10g • Evolution to statspack, requests for performance reporting improvements. • “Always on” approach to performance metrics with requirement of non- locking collection process. • Requires Management Diagnostic Pack License from Oracle.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | The Location in EM12c For Some of Today’s Presentation…
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Automatic Workload Repository, (AWR) Reports Always on with default intervals of 1hr snapshots and 8 days retention. Should have at least 60 days of retained data. Desire more? Have an AWR Warehouse. Interval increase? Use this during workload testing, otherwise, take a manual snapshot: EXEC DBMS_WORKLOAD_REPOSITORY.create_snapshot;
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Buffer writes one direction, we read the other!
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | AWR Reports Are Best Used For.. • To inspect a database level issues, for both a small window of time to extended window. • Extensive information in report, knowing HOW to parse through the report to achieve goal is important. • Via EM12c, the report is offered in HTML format and will be environment aware, (single instance, RAC, Exadata.) • Different reports available from the command line when running from the $ORACLE_HOME/rdbms/admin directory and can be generated in HTML or TXT format.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Wasting Time…. Rarely is there value in this section. As long is everything contains high percentages, move on.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | AWR- Top 10 Foreground •CPU is expected and should be the majority of time. •CPU processing can be extensive though, (still needs to be investigated) •Anything under 10% commonly is disregarded. •Understand what each wait event definition is
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Top SQL Focus on Elapsed Time, but… Displays Top SQL by: CPU IO Gets Reads, etc…
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Full SQL Statements Linked from Top SQL Lists in HTML report via SQL_ID links. Quick reference when needed.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | SGA “Thrashing”
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Why PGA is Important What is an optimal vs. 1 or (M)ulti-pass executions?
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Why Can’t I Achieve 100%?? You shall not pass! (optimal, so 90%, that is… )
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Percentages and Amounts of Reads are Important Top two objects correspond to SQL statements in the top IO and most likely top SQL by elapsed time.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | What is a Direct Physical Read? •Inefficient SQL and objects that have high quantity of row changes involved. •Adds significant pressure in RAC environment, too!
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Un-optimized vs. Optimized? Percentages are low per object, (under 10%, which is a good sign for any database!) This is an exadata, so it means they are either not in the buffer cache or the smart flash cache, which means un-optimized”. This is “somewhat” expected and don’t panic unless you see high percentages.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Initial Transaction Locks 10% rule applies here, too! ALTER TABLE <name> initrans <xx>;
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | RAC Interconnect Exchange •Data from V$SYSMETRIC_HISTORY •High Exchange rate can signal and issue.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | RAC Cache Interconnect Stats
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Transfer Rate Between RAC Nodes
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | ASH Reports • Excellent for identifying specific issues in database. • Identifies not just the top SQL, but code. • Shows top wait events by sample time. • Don’t confuse samples with AWR snapshots. • Should not be used to track # of executions.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Buffer writes one direction, We read the other!
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Running ASH Report from Cloud Control • ASH is by time, not snapshot. • Set start date and time. • End date and time • Generate report
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | HTML Format ASH
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Main ASH Info
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Top SQL, Top Sessions
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Oracle and/or its affiliates. All rights reserved. | Top SQL Details
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Top Parallel, Top DB Files
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | ASH Report- Use Case @$ORACLE_HOME/rdbms/admin/ashrpt.sql; Report Format: Text Performance Issue during day, need to know what’s going on! Run ASH Report from the command line with SQL*Plus:
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Oracle and/or its affiliates. All rights reserved. | “Interesting Part”
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Oracle and/or its affiliates. All rights reserved. | Finale! Select * from table(dbms_xplan.display_awr(‘43mp3mjufgnkg’));
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | AWR and ASH from the Command Line Interface All DBAs should know how to do this!
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Running Reports, Command Line $ORACLE_HOME/rdbms/admin/awrrpt.sql; $ORACLE_HOME/rdbms/admin/ashrpt.sql; $ORACLE_HOME/rdbms/admin/awrsqrpt.sql; Less Known AWR Reports: awrinfo.sql General AWR Info awrddrpt.sql Comparison report between snapshots awrblmig.sql Migrates pre-11g baseline data into 11g Baseline tables. awrgrpt.sql RAC Aware AWR Report.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | AWR Info Report Snapshot Interval Information Basic Info on Instances and Nodes No User or Application Schema info. Space Usage by SYSAUX WRH$ and Non- AWR Objects, ordered by size Snapshot info and if any errors. Advisor Tasks
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | AWR General Information Report
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | ASH Info Report @$ORACLE_HOME/rdbms/admin/ashrpt.sql; Report Format: Text or HTML
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | SQL_ID Specific AWR Report
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Querying ASH Data Directly • More defined reporting • No need to pull full report • Detail on waits that are of interest • Join to non-AWR objects • Examples and Ideas…
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | V$ACTIVE_SESSION_HISTORY • SAMPLE_ID- This is a unique identifier within an ASH sample. • SAMPLE_TIME- A unit of time used by Active Session History, (not to be confused with DB_TIME) • USER_ID- Identifier for a user that’s executing the session. • SESSION_ID- Same as the SID or Session ID and can be used to join to SID in other views/tables. • SESSION_STATE- What was the state of the session when ASH recorded the sample. • ON CPU/WAITING- The two session states in Active Session History. ON CPU is active, vs. Waiting, which is self-explanatory. • EVENT- Type of event that the session is currently active or waiting on. • TIME_WAITED- How long the session has been waiting if waiting. • WAIT_TIME- Confusing- but this is populated by any wait time if the session is currently active and for the previous waits. • SQL_ID- The unique identifier for the SQL statement being executed. • SQL_CHILD_NUMBER-The cursor child number.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Session Averages Select ROUND(RATIO_TO_REPORT(SUM(1)) OVER () * 100 ,2) PERCENTAGE,ash.session_type SESS_TYPE, session_state STATUS, decode(nvl(sql_id,'-1'),'-1','nonsql','sql') SQL_TYPE, count(distinct to_char(session_id)|| to_char(session_serial#)) SESS_CNT from v$active_session_history ash where sample_time > sysdate - 30/(24*60) and ( ( ash.session_state = 'ON CPU' ) or ( ash.session_type != 'BACKGROUND' )) group by ash.session_type, ash.session_state, decode(nvl(sql_id,'-1'),'-1','nonsql','sql') order by count(*) /
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Session Avg. Output • Note the % of Background processes
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Inspecting What select * from (select ash.SQL_ID , ash.SQL_PLAN_HASH_VALUE Plan_hash, aud.name type, sum(decode(ash.session_state,'ON CPU',1,0)) "CPU", sum(decode(ash.session_state,'WAITING',1,0)) "WAITING", sum(decode(ash.session_state,'WAITING', decode(wait_class, 'User I/O',1,0),0)) "IO WAIT" , sum(decode(ash.session_state,'WAITING', decode(wait_class, 'User I/O',1,0),0)) "IO" , sum(decode(ash.session_state,'WAITING', decode(wait_class, 'Concurrency',1,0))) "CONCURRENCY" , sum(decode(ash.session_state,'WAITING', decode(wait_class, 'Application',1,0))) "Application" , sum(decode(ash.session_state,'ON CPU',1,1)) "TOTAL" from v$active_session_history ash, audit_actions aud where SQL_ID is not NULL and ash.sql_opcode=aud.action and ash.sample_time > sysdate - &minutes /( 60*24) group by sql_id, SQL_PLAN_HASH_VALUE , aud.name order by sum(decode(session_state,'ON CPU',1,1)) desc ) where rownum < 5;
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Oracle and/or its affiliates. All rights reserved. | 10 Min. View of Waits by SQL_ID • Choose Time in Minutes To Review, (10 in our example) • SQL_ID and Plan Hash Value Shown • Waits for CPU, Wait, IO Wait and others.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Quantity of Events Occurred Over Small Amounts of Time Col event for a50 select event, count(1) from v$active_session_history where sample_time between to_date('21-FEB-14 01.43.00 PM','dd-MON-yy hh:mi:ss PM') and to_date('21-FEB-15 01.53.00 PM','dd-MON-yy hh:mi:ss PM') group by event order by event;
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Oracle and/or its affiliates. All rights reserved. | Results, Where to Focus?
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Transaction Wait Detail select to_char(sample_time,'HH:MI') st, substr(event,0,20) event, ash.session_id sid, mod(ash.p1,16) lm, ash.p2, ash.p3, nvl(o.object_name,ash.current_obj#) objn, substr(o.object_type,0,10) otype, CURRENT_FILE# fn, CURRENT_BLOCK# blockn, ash.SQL_ID, BLOCKING_SESSION bsid from v$active_session_history ash, all_objects o where event like 'enq: TX%' and o.object_id (+)= ash.CURRENT_OBJ# and sample_time > sysdate - 10/(60*24) order by sample_time;
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Transaction Lock Output What TX row locks are occurring!
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Knowing What’s in the ASH Buffer Deters from making assumptions on what data is being queried. Know your samples!
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Wait Events Across Nodes
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Oracle and/or its affiliates. All rights reserved. | Query top 10 SQL_ID’s in the last 10 minutes?
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | SQL_ID and CPU Usage
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | IO Waits by Object from ASH
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | SQL Text with ASH SQL for most recent five minutes of sample data from ASH
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | SQL Results SQL_ID, SQL Text, Sample Time that Process was captured in.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Graphing From the CLI, via Kyle Hailey-
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Formatting and Setup accept hours prompt "hours (default 12) : " default 12 select &hours f_hours from dual; select 3600 f_secs from dual; select &v_secs f_samples from dual; select 30 f_graph from dual; select to_char(to_date(tday||' '||tmod*&v_secs,'YYMMDD SSSSS'),'DD-MON HH24:MI:SS') tm, samples npts,total/&samples aas, substr(substr(substr(rpad('+',round((cpu*&v_bars)/&samples),'+') || rpad('-',round((waits*&v_bars)/&samples),'-') || rpad(' ',p.value * &v_bars,' '),0,(p.value * &v_bars)) || p.value || substr(rpad('+',round((cpu*&v_bars)/&samples),'+') || rpad('-',round((waits*&v_bars)/&samples),'-') || rpad(' ',p.value * &v_bars,' '),(p.value * &v_bars),10) ,0,30) ,0,&v_graph)graph,total,cpu, waits from ( URL to Kyle Hailey’s Original, Fully Formatted Query
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | select to_char(sample_time,'YYMMDD')tday , trunc(to_char(sample_time,'SSSSS')/&v_secs) tmod , sum(decode(session_state,'ON CPU',1,decode(session_type,'BACKGROUND',0,1))) total , (max(sample_id) - min(sample_id) + 1 ) samples , sum(decode(session_state,'ON CPU' ,1,0)) cpu , sum(decode(session_type,'BACKGROUND',0,decode(session_state,'WAITING',1,0))) waits from v$active_session_history where sample_time > sysdate - &v_hours/24 group by trunc(to_char(sample_time,'SSSSS')/&v_secs), to_char(sample_time,'YYMMDD') union all select to_char(sample_time,'YYMMDD')tday, trunc(to_char(sample_time,'SSSSS')/&v_secs) tmod , sum(decode(session_state,'ON CPU',10,decode(session_type,'BACKGROUND',0,10))) total , (max(sample_id) - min(sample_id) + 1 ) samples, sum(decode(session_state,'ON CPU' ,10,0)) cpu , sum(decode(session_type,'BACKGROUND',0,decode(session_state,'WAITING',10,0))) waits from dba_hist_active_sess_history where sample_time > sysdate - &v_hours/24 and sample_time < (select min(sample_time) from v$active_session_history) group by trunc(to_char(sample_time,'SSSSS')/&v_secs), to_char(sample_time,'YYMMDD')) ash, v$parameter p where p.name='cpu_count' order by to_date(tday||' '||tmod*&v_secs,'YYMMDD SSSSS'); **Thanks to Kyle Hailey for this great graph via the CLI
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Pivot the Wait Events
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Digging into History • DBA_HIST_ACTIVE_SESS_HISTORY SNAP_ID SAMPLE_ID SAMPLE_TIME SESSION_ID USER_ID SQL_ID WAIT_CLASS SESSION_STATE PGA_ALLOCATED
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Process Information SELECT * FROM ( SELECT /*+ PARALLEL */ count(*) AS count, user_id, program, module, sql_id FROM SYS.DBA_HIST_ACTIVE_SESS_HISTORY WHERE sample_time > TO_DATE('19-FEB-2014 03.00.00 PM','dd-MON-yy hh:mi:ss PM') AND sample_time < TO_DATE('19-FEB-2014 08.00.00 PM','dd-MON-yy hh:mi:ss PM') AND program LIKE 'oracle@%' GROUP BY user_id, program, module, machine, sql_id ORDER BY count(*) desc ) WHERE rownum <= 20 /
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Results of Process History
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Tyler Muth ASH Mining Query
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | ASH Mining Output Additional Options: • Physical Read Averages • Physical Writes, (Max/Averages) • Redo Info • Login Info • Hard Parsing, etc.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Best Practice When Querying ASH Data Keep it Simple and don’t reinvent the wheel. Again- samples are an alias for time, not for counts. Understand what is valuable and compare to packaged reports. Be aware on RAC of node specific data. Take care when querying Obj#, File# and Block#, (still issues in different versions…) Check the time that is available in buffer, don’t assume!
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | 2-3PM, 12th Vs. 13th Familiar interface with visual wait event comparisons. Average # of sessions during each period are displayed.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | IO Bound Dashboard Base vs. comparison period Temp reads/writes specified Single block read latency
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | SQL Monitor, EM12c Style • One More way to identify performance issues. • Monitoring view ease for those less familiar with database performance.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | SQL Monitor Dashboard Status of Statement Wait Events Degree of Parallelism SQL_ID SQL Text
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Exadata and Offloading • Drill down to specific statement within SQL Monitor will display offload efficiency per statement.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Full Detail of SQL Execution
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | View Report
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | SQL Monitor Report via the Command Line Interface SET LONG 1000000 SET LONGCHUNKSIZE 1000000 SET LINESIZE 1000 SET PAGESIZE 0 SET TRIM ON SET TRIMSPOOL ON SET ECHO OFF SET FEEDBACK OFF SELECT DBMS_SQLTUNE.report_sql_monitor( sql_id => '5vh6y3b7tnv8r', type => 'TEXT', report_level => 'ALL') AS report FROM dual;
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Text Output of SQL Monitor
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | One of the Best & Least Used Features in Enterprise Manager: Search SQL Problem Query
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | We Have the SQL_ID, What Next? 4v2tsp8dz0nhn is our SQL_ID Go to the EM Console, (Example is EM12c)
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Search SQL Interface Choose AWR Snapshots, (change Time Period), AWR Baselines and put SQL_ID
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Click on Search SQL_ID link for SQL Details Split up by tabs for Cursor, AWR, Baselines and SQL Tuning Sets Plan Hash Value Elapsed Time
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Snapshot Data
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Identify Using the information provided by Search SQL, locate the correct plan hash value to create a profile from.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | SQL Details
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | AWR Report or Run ADDM Report
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Baseline Impact? Third Tab contains Baseline Information and links to verify if implemented.
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | AWR/ASH Links/Blogs • Tyler Muth: http://tylermuth.wordpress.com/ • Kyle Hailey, John Beresniewicz, Graham Wood: http://ashmasters.com/ • Mine- “For the Love of ASH and AWR” http://dbakevlar.com/2011/02/for- the-love-of-awr-and-ash/ • Using AWR Reports: http://dbakevlar.com/2015/01/working-with-awr- reports-from-em12c/ • How to Use an ASH Report: http://dbakevlar.com/2015/02/how-to-use-an- ash-report-and-why/ • SQL ID Specific Performance Information: http://dbakevlar.com/2015/05/sql-id-specific-performance-information/
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Copyright © 2014
Oracle and/or its affiliates. All rights reserved. | Connect with me-
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