barunsql performance tuning with oracle ash awr real world use cases public

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SQL Performance Tuning with Oracle AWR & ASH


Real World Use Cases

About myself

• Vlado Barun, M.Sc.– Sr Principal Performance Engineer with Oracle Cloud ServicesSr. Principal Performance Engineer with Oracle Cloud Services– OCP, OCE SQL, MCP– 15 years in the Database Arena (Oracle DB - 10 years)


Objective

• Enable you to start exploring the rich repository of performance metrics in ASH & AWR independent of anyperformance metrics in ASH & AWR independent of any specific GUI and related limitations

• Provide list of resources that enable you to “hit the ground running”


Agenda

• Introduction to ASH & AWR (very brief)• Review 2 real world production use cases• Review 2 real world production use cases

– step-by-step from data gathering to resolution– write ASH/AWR queries from scratch– use pre-existing free scripts– Note: check license requirements

• ResourcesResources


Automatic Workload Repository (AWR)

• Collects database performance statistics– Objects (access and usage statistics)– SQL Statement statisticsSQL Statement statistics– Wait events statistics– System statistics

ASH Statistics (DBA HIST ACTIVE SESS HISTORY)– ASH Statistics (DBA_HIST_ACTIVE_SESS_HISTORY)– Time Model Statistics based on time usage for activities– Every 1 hr by default

• Stored in DBA_HIST% views• How to access?

$ORACLE HOME/rdbms/admin/awrrpt sql SQLT custom– $ORACLE_HOME/rdbms/admin/awrrpt.sql, SQLT, custom scripts,…

– OEM, SQL DeveloperOth t l


– Other tools

Active Session History (ASH) Introduction

v$active_session_history(1 d i l )

dba_hist_active_sess_history(10 second inter als)(1 second intervals) (10 second intervals)

3 ASH Samples in AWR

Browse Books

Read ReviewsFor One Book Add to Cart Checkout

TIME

21 ASH Samples

= time spent in database

SQL Trace (Microsecond level)Application Logging (custom level)


When Row Source ObjectASH - DimensionsSAMPLE_IDSAMPLE_TIME

SessionSESSION ID

SQL_PLAN_LINE_IDSQL_PLAN_OPERATION

WaitsEVENT

jCURRENT_OBJ#CURRENT_FILE#CURRENT_BLOCK#CURRENT_ROW#

A li tiSESSION_IDSESSION_SERIAL#SESSION_TYPESESSION_STATEUSER_IDQC_INSTANCE_IDQC SESSION ID

EVENTEVENT_IDEVENT#SEQ#P1TEXTP1P2TEXT

ApplicationSERVICE_HASHPROGRAMMODULEACTIONMACHINEQC_SESSION_ID

QC_SESSION_SERIAL#CLIENT_IDIN and IS columns

SQL

P2TEXTP2P3TEXTP3WAIT_CLASSWAIT_CLASS_IDWAIT TIME

MACHINE

StatisticsTM_DELTA_TIMETM DELTA CPU TIMESQL

SQL_IDIS_SQLID_CURRENTSQL_CHILD_NUMBERSQL_OPCODESQL_OPNAMETOP LEVEL SQL ID

WAIT_TIMETIME_WAITEDCURRENT_OBJ#CURRENT_FILE#CURRENT_BLOCK#CURRENT_ROW#

TM_DELTA_CPU_TIMETM_DELTA_DB_TIMEDELTA_TIMEDELTA_READ_IO_REQUESTSDELTA_WRITE_IO_REQUESTSDELTA_READ_IO_BYTES

TOP_LEVEL_SQL_IDTOP_LEVEL_SQL_OPCODESQL_EXEC_IDSQL_EXEC_STARTSQL_PLAN_HASH_VALUESQL_PLAN_OPTIONS

Blocking SessionBLOCKING_SESSION_STATUSBLOCKING_SESSIONBLOCKING_SESSION_SERIAL#

OC G S

DELTA_WRITE_IO_BYTESDELTA_INTERCONNECT_IO_BYTESPGA_ALLOCATEDTEMP_SPACE_ALLOCATED


BLOCKING_INST_IDBLOCKING_HANGCHAIN_INFO

ASH - Summary

• Samples the current state of all active session– 1 second samples

Stores various attributes (dimensions) of a session– Stores various attributes (dimensions) of a session

• Stored in – V$ACTIVE_SESSION_HISTORY_ _

• 1-second sampling rate– DBA_HIST_ACTIVE_SESS_HISTORY

- Sub-sampling to disk into AWR Snapshot- 1-in-10 samples

• How to access?- $ORACLE HOME/rdbms/admin/ashrpt.sql, ashrpti.sql, SQLT, custom$ORACLE_HOME/rdbms/admin/ashrpt.sql, ashrpti.sql, SQLT, custom

scripts,…- OEM, SQL Developer, Real Time SQL Monitoring, …- Other tools


GUI command lineor

• It is about knowing the right tool for the right situation• Understand the strengths and weaknesses of each

GUI t l t th d li k• GUI tools strengths– Easy to use– Good visualization of data

=> cmd line weaknesses

Good visualization of data– Provides concise summary of system activity– etc…

Performance data

• GUI tools weaknesses– Slow - click…wait…click…wait…

A il bilit GUI i f t t i d

Performance data exposed by GUI

=> cmd line strength

– Availability – GUI infrastructure is down– Limited exposure – subset of available data– etc


etc…

ASH dimensions growth

See

https://sites.google.com/site/embtdbo/wait‐event‐documentation/ash‐‐‐active‐session‐history


Wh t Id tif

Understand the issueWhat Identify

(app is slow)

Quantify

InitialData

collectionHow Much(takes 1m)

Timeline(during peak hours)

AWR/ASH, Trace,Apps Logs/Tables,OS/IO stats etcWhen

( g p )

Component(Web Tier, App Tier, DB , Network, Storage,

WhereAnalyze

etc.)

Flow chartHow

Additional

Root Cause(Stats not updated)

SQL/Object Stats, Execution Plans,etcWhy

AdditionalData

Collectionand

Analysis


Use Case 1

What Slow ETLWhat Slow ETL

20+ hoursHow Much

Once a monthWhen

Informatica + DBWhere

How Extract, Transform, Load


Find slow SQL (ASH)

SQL> SELECT sql_id2 , COUNT(*) as sample_count3 FROM v$active_session_history_ _4 WHERE sample_time BETWEEN TO_DATE('2011-06-29 07:57', 'yyyy-mm-dd hh24:mi')5 AND TO_DATE('2011-06-30 04:30', 'yyyy-mm-dd hh24:mi')6 AND user_id = 617 AND program like 'pmdtm@%'8 GROUP BY sql id8 GROUP BY sql_id9 ORDER BY 2 DESC

10 ;

no rows selected

SQL> SELECT min(sample_time)2 FROM v$active_session_history3 ;

MIN(SAMPLE_TIME)----------------------------------------2011-07-01 19:14:48

1 row selected.


Find slow SQL (ASH in AWR)SELECT sql_id

, COUNT(*) as sample_countFROM dba_hist_active_sess_historyv$active_session_history

WHERE sample time BETWEEN TO DATE('2011-06-29 07:57' 'yyyy-mm-dd hh24:mi')JOIN dba_hist_snapshot USING (dbid, instance_number, snap_id)WHERE sample_time BETWEEN TO_DATE( 2011-06-29 07:57 , yyyy-mm-dd hh24:mi )AND TO_DATE('2011-06-30 04:30', 'yyyy-mm-dd hh24:mi')

AND user_id = 61AND program like 'pmdtm@%‘

GROUP BY sql id

_ _ _ _

AND begin interval time BETWEEN TO DATE('2011-06-29 07:00' 'yyyy-mm-dd hh24:mi')GROUP BY sql_idORDER BY 2 DESC

;

AND begin_interval_time BETWEEN TO_DATE( 2011 06 29 07:00 , yyyy mm dd hh24:mi )AND TO_DATE('2011-06-30 05:00', 'yyyy-mm-dd hh24:mi')

SQL_ID SAMPLE_COUNT_ _------------- ------------dkwucgaxxhm2z 7362grksgbxxuacaf 6041…24 rows selected


24 rows selected.

Find slow SQL (ASH in AWR) - readableSQL>SELECT sql id sql typeSQL>SELECT sql_id, sql_type

2 , round(sample_cnt_sql/sample_cnt_total*100) as sample_pct3 , round(sample_cnt_sql /6/60,1) hours4 FROM(SELECT DISTINCT sql_id5 , aa.name AS sql_type6 , COUNT(*) over (PARTITION BY sql_id) AS sample_cnt_sql7 , COUNT(*) over () AS sample_cnt_total8 FROM dba_hist_active_sess_history ash9 JOIN dba_hist_snapshot s USING (dbid, INSTANCE_NUMBER, snap_id)

10 JOIN audit actions aa on (ash.sql opcode = aa.action)10 JOIN audit_actions aa on (ash.sql_opcode aa.action)11 WHERE begin_interval_time BETWEEN

… snip …18 ORDER BY 3 desc)19 WHERE rownum <= 3;

SQL_ID SQL_TYPE SAMPLE_PCT HOURS------------- -------- ---------- -----dkwucgaxxhm2z SELECT 25 20.4grksgbxxuacaf SELECT 21 16 8grksgbxxuacaf SELECT 21 16.8gh6w2fm3avn3j SELECT 12 10.1

3 rows selected.


When Row Source ObjectActive Session History (ASH) - DimensionsSAMPLE_IDSAMPLE_TIME

SessionSESSION ID

SQL_PLAN_LINE_IDSQL_PLAN_OPERATION

WaitsEVENT

jCURRENT_OBJ#CURRENT_FILE#CURRENT_BLOCK#CURRENT_ROW#

A li tiSESSION_IDSESSION_SERIAL#SESSION_TYPESESSION_STATEUSER_IDQC_INSTANCE_IDQC SESSION ID

EVENTEVENT_IDEVENT#SEQ#P1TEXTP1P2TEXT

ApplicationSERVICE_HASHPROGRAMMODULEACTIONMACHINEQC_SESSION_ID

QC_SESSION_SERIAL#CLIENT_IDIN and IS columns

SQL

P2TEXTP2P3TEXTP3WAIT_CLASSWAIT_CLASS_IDWAIT TIME

MACHINE

StatisticsTM_DELTA_TIMETM DELTA CPU TIMESQL

SQL_IDIS_SQLID_CURRENTSQL_CHILD_NUMBERSQL_OPCODESQL_OPNAMETOP LEVEL SQL ID

WAIT_TIMETIME_WAITEDCURRENT_OBJ#CURRENT_FILE#CURRENT_BLOCK#CURRENT_ROW#

TM_DELTA_CPU_TIMETM_DELTA_DB_TIMEDELTA_TIMEDELTA_READ_IO_REQUESTSDELTA_WRITE_IO_REQUESTSDELTA_READ_IO_BYTES

TOP_LEVEL_SQL_IDTOP_LEVEL_SQL_OPCODESQL_EXEC_IDSQL_EXEC_STARTSQL_PLAN_HASH_VALUESQL_PLAN_OPTIONS

Blocking SessionBLOCKING_SESSION_STATUSBLOCKING_SESSIONBLOCKING_SESSION_SERIAL#

OC G S

DELTA_WRITE_IO_BYTESDELTA_INTERCONNECT_IO_BYTESPGA_ALLOCATEDTEMP_SPACE_ALLOCATED


BLOCKING_INST_IDBLOCKING_HANGCHAIN_INFO

AWR SQL statsSQL> SELECT PLAN HASH VALUESQL> SELECT PLAN_HASH_VALUE,

2 , sum(EXECUTIONS_DELTA) as executions3 , sum(ROWS_PROCESSED_DELTA) as rows_processed4 , sum(ELAPSED_TIME_DELTA) as elapsed_time5 , sum(CPU_TIME_DELTA) as cpu_time, sum(IOWAIT_DELTA) as iowait_time6 , sum(DIRECT_WRITES_DELTA) as direct_writes7 , sum(BUFFER_GETS_DELTA) as LIO, sum(DISK_READS_DELTA) as PIO8 FROM dba_hist_sqlstat9 WHERE snap_id between 132042 and 132124

10 AND sql id = 'dkwucgaxxhm2z'10 AND sql_id dkwucgaxxhm2z11 GROUP BY sql_id, PLAN_HASH_VALUE, OPTIMIZER_ENV_HASH_VALUE;

Plan IOHash Rows Elapsed CPU WAIT Direct

Value EXECUTIONS Processed Time TIME TIME Writes LIO PIOValue EXECUTIONS Processed Time TIME TIME Writes LIO PIO---------- ---------- ---------- ---------- ---------- ----------- -------- -------- -------1700726234 1 5997889 7.3806E+10 903837577 73047955458 219418 36152215 6427679

1 row selected.


AWR SQL stats - readableSQL> SELECT PLAN HASH VALUE executionsSQL> SELECT PLAN_HASH_VALUE, executions

2 , round(elapsed_time /1000000/60/60,1) as elapsed_hours3 , rows_processed4 , round(cpu_time /elapsed_time * 100) as cpu_time_pct5 round(iowait time /elapsed time * 100) as iowait pct5 , round(iowait_time /elapsed_time 100) as iowait_pct6 , LIO, PIO, direct_writes7 , round(iowait_time /PIO/1000,1) as mili_sec_PIO8 FROM(SELECT PLAN_HASH_VALUE9 , sum(EXECUTIONS DELTA) as executions9 , sum(EXECUTIONS_DELTA) as executions

10 , sum(ROWS_PROCESSED_DELTA) as rows_processed11 , sum(ELAPSED_TIME_DELTA) as elapsed_time12 , sum(CPU_TIME_DELTA) as cpu_time, sum(IOWAIT_DELTA) as iowait_time13 , sum(DIRECT_WRITES_DELTA) as direct_writes14 , sum(BUFFER_GETS_DELTA) as LIO, sum(DISK_READS_DELTA) as PIO15 FROM dba_hist_sqlstat16 WHERE snap_id between 132042 and 13212417 AND sql_id = 'dkwucgaxxhm2z'18 GROUP BY sql id, PLAN HASH VALUE);q _ , _ _ );

Plan CPU IO MilisecHash Elapsed Rows TIME WAIT Direct /

Value EXECUTIONS Hours Processed PCT PCT LIO PIO Writes Pio---------- ---------- -------- ---------- ---- ----- ---------- ---------- -------- -------


1700726234 1 20.5 5,997,889 1 99 36,152,215 6,427,679 219,418 11.4

AWR SQL planSQL>select * from table(dbms xplan display awr('dkwucgaxxhm2z' 1700726234 nullSQL>select * from table(dbms_xplan.display_awr( dkwucgaxxhm2z , 1700726234, null, 'ALL LAST'));

----------------------------------------------------------------------------------------------------------------------| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |----------------------------------------------------------------------------------------------------------------------| 0 | SELECT STATEMENT | | | | | 9553K(100)| || 1 | NESTED LOOPS OUTER | | 8011K| 46G| | 9553K (1)| 31:50:39 || 2 | NESTED LOOPS OUTER | | 8011K| 45G| | 7148K (1)| 23 49 40 || 2 | NESTED LOOPS OUTER | | 8011K| 45G| | 7148K (1)| 23:49:40 || 3 | NESTED LOOPS OUTER | | 8011K| 45G| | 4743K (1)| 15:48:44 || 4 | NESTED LOOPS OUTER | | 8011K| 45G| | 3941K (1)| 13:08:24 || 5 | NESTED LOOPS OUTER | | 8011K| 44G| | 3140K (1)| 10:28:03 || 6 | HASH JOIN RIGHT OUTER | | 8011K| 44G| | 2338K (1)| 07:47:43 || 7 | VIEW | index$_join$_009 | 6633 | 285K| | 39 (3)| 00:00:01 || 8 | HASH JOIN | | | | | | || 9 | HASH JOIN | | | | | | || 10 | INDEX FAST FULL SCAN | S_SRC_M10 | 6633 | 285K| | 10 (0)| 00:00:01 || 11 | INDEX FAST FULL SCAN | S SRC M12 | 6633 | 285K| | 10 (0)| 00:00:01 || 11 | INDEX FAST FULL SCAN | S_SRC_M12 | 6633 | 285K| | 10 (0)| 00:00:01 || 12 | INDEX FAST FULL SCAN | S_SRC_P1 | 6633 | 285K| | 8 (0)| 00:00:01 || 13 | HASH JOIN RIGHT OUTER | | 8011K| 44G| 228M| 2338K (1)| 07:47:42 || 14 | TABLE ACCESS FULL | S_ORG_EXT_LSX | 7488K| 142M| | 38163 (2)| 00:07:38 || 15 | HASH JOIN RIGHT OUTER | | 8011K| 43G| | 51545 (1)| 00:10:19 || 16 | TABLE ACCESS FULL | S_INDUST_LANG | 4023 | 113K| | 199 (0)| 00:00:03 || 17 | HASH JOIN RIGHT OUTER | | 8011K| 43G| | 51289 (1)| 00:10:16 || 18 | TABLE ACCESS FULL | S_ORG_PRTNR | 324 | 43740 | | 8 (0)| 00:00:01 || 19 | NESTED LOOPS OUTER | | 8011K| 42G| | 51224 (1)| 00:10:15 || 20 | VIEW | | 8011K| 42G| | 51169 (1)| 00:10:15 || 20 | VIEW | | 8011K| 42G| | 51169 (1)| 00:10:15 || 21 | NESTED LOOPS | | | | | | || 22 | NESTED LOOPS | | 8011K| 8091M| | 51169 (1)| 00:10:15 || 23 | INDEX FULL SCAN | SO_ANA_BU_U2 | 19 | 285 | | 1 (0)| 00:00:01 || 24 | INDEX RANGE SCAN | S_ORG_EXT_M91 | 74493 | | | 35 (3)| 00:00:01 || 25 | TABLE ACCESS BY INDEX ROWID| S_ORG_EXT | 421K| 419M| | 2693 (1)| 00:00:33 || 26 | TABLE ACCESS BY INDEX ROWID | S_OU_PRTNR_TYPE | 1 | 94 | | 1 (0)| 00:00:01 || 27 | INDEX UNIQUE SCAN | S_OU_PRTNR_TYPE_P1 | 1 | | | 1 (0)| 00:00:01 || 28 | TABLE ACCESS BY INDEX ROWID | S_ORG_EXT | 1 | 42 | | 1 (0)| 00:00:01 || 29 | INDEX UNIQUE SCAN | S ORG EXT P1 | 1 | | | 1 (0)| 00:00:01 |_ _ _| 30 | TABLE ACCESS BY INDEX ROWID | S_ORG_EXT | 1 | 42 | | 1 (0)| 00:00:01 || 31 | INDEX UNIQUE SCAN | S_ORG_EXT_P1 | 1 | | | 1 (0)| 00:00:01 || 32 | TABLE ACCESS BY INDEX ROWID | S_ORG_EXT | 1 | 42 | | 1 (0)| 00:00:01 || 33 | INDEX UNIQUE SCAN | S_ORG_EXT_P1 | 1 | | | 1 (0)| 00:00:01 || 34 | TABLE ACCESS BY INDEX ROWID | S_ADDR_PER | 1 | 59 | | 1 (0)| 00:00:01 || 35 | INDEX UNIQUE SCAN | S_ADDR_PER_P1 | 1 | | | 1 (0)| 00:00:01 || 36 | TABLE ACCESS BY INDEX ROWID | S_ADDR_PER | 1 | 59 | | 1 (0)| 00:00:01 || 37 | INDEX UNIQUE SCAN | S_ADDR_PER_P1 | 1 | | | 1 (0)| 00:00:01 |----------------------------------------------------------------------------------------------------------------------


…

Find slow SQL (ASH in AWR)LECT sql id sql typeLECT sql_id, sql_type

, round(sample_cnt_sql/sample_cnt_total*100) as sample_pct, round(sample_cnt_sql /6/60,1) hours

FROM(SELECT DISTINCT sql_id, aa.name AS sql_type, COUNT(*) over (PARTITION BY sql_id) AS sample_cnt_sql, COUNT(*) over () AS sample_cnt_total

FROM dba_hist_active_sess_history ashJOIN dba_hist_snapshot s USING (dbid, INSTANCE_NUMBER, snap_id)JOIN audit actions aa on (ash.sql opcode = aa.action)JOIN audit_actions aa on (ash.sql_opcode aa.action)

WHERE begin_interval_time BETWEEN …

ORDER BY 3 desc)WHERE rownum <= 3;

SQL_TYPE SAMPLE_PCT HOURS------- -------- ---------- -----axxhm2z SELECT 25 20.4xxuacaf SELECT 21 16 8xxuacaf SELECT 21 16.8m3avn3j SELECT 12 10.1

selected.

ASH rowsource data (plan line id)LECT sql_id, sql_plan_line_id

, round(sample_cnt_plan_line/sample_cnt_total*100) AS sql_plan_line_pct, round(sample_cnt_plan_line/6) minutes

OM(SELECT DISTINCT sql id sql plan line idSELECT DISTINCT sql_id, sql_plan_line_id

, COUNT(*) over (PARTITION BY sql_plan_line_id) AS sample_cnt_plan_line , COUNT(*) over () AS sample_cnt_total

FROM dba_hist_active_sess_history ashJOIN dba_hist_snapshot s USING (dbid, INSTANCE_NUMBER, snap_id)

WHERE sql_id = 'dkwucgaxxhm2z‘ and begin_interval_time BETWEEN…

SQL_PLAN_LINE_ID SQL_PLAN_LINE_PCT MINUTES------- ---------------- ----------------- ----------axxhm2z 34 48 593axxhm2z 35 27 331axxhm2z 25 17 213

ASH rowsource (plan line id + event)ECT sql_id, sql_plan_line_id, event_ _ _ _round(sample_cnt_plan_line_event/sample_cnt_total*100) as plan_line_event_pctround(sample_cnt_plan_line_event/6) minutesOM (SELECT DISTINCT sql_id, sql_plan_line_id, nvl(event, 'CPU') as eventUNT(*) over (PARTITION BY sql plan line id event)AS sample cnt plan line eventUNT(*) over (PARTITION BY sql_plan_line_id,event)AS sample_cnt_plan_line_eventUNT(*) over () AS sample_cnt_total

FROM dba_hist_active_sess_history ashJOIN dba_hist_snapshot s USING (dbid, INSTANCE_NUMBER, snap_id)

WHERE sql_id = 'dkwucgaxxhm2z' and begin_interval_time BETWEEN ……

SQL_PLAN_LINE_ID EVENT PLAN_LINE_EVENT_PCT MINUTES----- ---------------- ------------------------- ------------------- ----------xhm2z 34 db file sequential read 48 591xhm2z 35 db file sequential read 27 328xhm2z 25 db file sequential read 17 212

selected.

ASH rowsource (10g) (object + event)ECT sql id object name eventECT sql_id, object_name, event , round(sample_cnt_object_event/sample_cnt_total*100) as object_event_pct , round(sample_cnt_object_event/6) minutes

M(SELECT DISTINCT sql_id, object_name, eventcount(*) over (partition by object_name,event) as sample_cnt_object_eventcount(*) over () as sample_cnt_total

ROM ( SELECT sql_id, nvl(event,'CPU') as event, case

when wait_class_id in (3871361733,1740759767,427450380,3875070507) then object name else 'N/A‘ end as object namethen object_name else N/A end as object_name

FROM dba_hist_active_sess_history ash…

OBJECT_NAME EVENT OBJECT_EVENT_PCT MINUTES----- -------------------- ------------------------- ---------------- ----------xhm2z S_ADDR_PER db file sequential read 52 634xhm2z S_ADDR_PER_P1 db file sequential read 28 347xhm2z S_ORG_EXT db file sequential read 16 195

AWR SQL plan-----------------------------------------------------------------------------------------------------------ration | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |-----------------------------------------------------------------------------------------------------------ECT STATEMENT | | | | | 9553K(100)| |STED LOOPS OUTER | | 8011K| 46G| | 9553K (1)| 31:50:39 |ESTED LOOPS OUTER | | 8011K| 45G| | 7148K (1)| 23:49:40 |NESTED LOOPS OUTER | | 8011K| 45G| | 4743K (1)| 15:48:44 |NESTED LOOPS OUTER | | 8011K| 45G| | 3941K (1)| 13:08:24 | NESTED LOOPS OUTER | | 8011K| 44G| | 3140K (1)| 10:28:03 || | | | | ( )| | HASH JOIN RIGHT OUTER | | 8011K| 44G| | 2338K (1)| 07:47:43 | VIEW | index$_join$_009 | 6633 | 285K| | 39 (3)| 00:00:01 | HASH JOIN | | | | | | | HASH JOIN | | | | | | | INDEX FAST FULL SCAN | S_SRC_M10 | 6633 | 285K| | 10 (0)| 00:00:01 | INDEX FAST FULL SCAN | S_SRC_M12 | 6633 | 285K| | 10 (0)| 00:00:01 | INDEX FAST FULL SCAN | S_SRC_P1 | 6633 | 285K| | 8 (0)| 00:00:01 | HASH JOIN RIGHT OUTER | | 8011K| 44G| 228M| 2338K (1)| 07:47:42 |

• IO is 99% of elapsed time• 75% of time in nested loop

(2,34,35)

• IO is 99% of elapsed time• 75% of time in nested loop

(2,34,35) TABLE ACCESS FULL | S_ORG_EXT_LSX | 7488K| 142M| | 38163 (2)| 00:07:38 | HASH JOIN RIGHT OUTER | | 8011K| 43G| | 51545 (1)| 00:10:19 | TABLE ACCESS FULL | S_INDUST_LANG | 4023 | 113K| | 199 (0)| 00:00:03 | HASH JOIN RIGHT OUTER | | 8011K| 43G| | 51289 (1)| 00:10:16 | TABLE ACCESS FULL | S_ORG_PRTNR | 324 | 43740 | | 8 (0)| 00:00:01 | NESTED LOOPS OUTER | | 8011K| 42G| | 51224 (1)| 00:10:15 | VIEW | | 8011K| 42G| | 51169 (1)| 00:10:15 | NESTED LOOPS | | | | | | |

( , , )• Query is processing a large

data set• Nested loop is not an efficient

method for joining large data

( , , )• Query is processing a large

data set• Nested loop is not an efficient

method for joining large data NESTED LOOPS | | 8011K| 8091M| | 51169 (1)| 00:10:15 | INDEX FULL SCAN | SO_ANA_BU_U2 | 19 | 285 | | 1 (0)| 00:00:01 | INDEX RANGE SCAN | S_ORG_EXT_M91 | 74493 | | | 35 (3)| 00:00:01 | TABLE ACCESS BY INDEX ROWID| S_ORG_EXT | 421K| 419M| | 2693 (1)| 00:00:33 | TABLE ACCESS BY INDEX ROWID | S_OU_PRTNR_TYPE | 1 | 94 | | 1 (0)| 00:00:01 | INDEX UNIQUE SCAN | S_OU_PRTNR_TYPE_P1 | 1 | | | 1 (0)| 00:00:01 | TABLE ACCESS BY INDEX ROWID | S_ORG_EXT | 1 | 42 | | 1 (0)| 00:00:01 | INDEX UNIQUE SCAN | S_ORG_EXT_P1 | 1 | | | 1 (0)| 00:00:01 |

method for joining large data sets

• Why does the CBO choose this inefficient plan ?!

– Bad stats?

method for joining large data sets

• Why does the CBO choose this inefficient plan ?!

– Bad stats?_ _ _ TABLE ACCESS BY INDEX ROWID | S_ORG_EXT | 1 | 42 | | 1 (0)| 00:00:01 | INDEX UNIQUE SCAN | S_ORG_EXT_P1 | 1 | | | 1 (0)| 00:00:01 |TABLE ACCESS BY INDEX ROWID | S_ORG_EXT | 1 | 42 | | 1 (0)| 00:00:01 | INDEX UNIQUE SCAN | S_ORG_EXT_P1 | 1 | | | 1 (0)| 00:00:01 |TABLE ACCESS BY INDEX ROWID | S_ADDR_PER | 1 | 59 | | 1 (0)| 00:00:01 |INDEX UNIQUE SCAN | S_ADDR_PER_P1 | 1 | | | 1 (0)| 00:00:01 |ABLE ACCESS BY INDEX ROWID | S_ADDR_PER | 1 | 59 | | 1 (0)| 00:00:01 |INDEX UNIQUE SCAN | S_ADDR_PER_P1 | 1 | | | 1 (0)| 00:00:01 |

– Incorrect optimizer settings?– Or something else?– Incorrect optimizer settings?– Or something else?

_ _ _-----------------------------------------------------------------------------------------------------------

AWR SQL statsELECT PLAN HASH VALUE executionsELECT PLAN_HASH_VALUE, executions

, round(elapsed_time /1000000/60/60,1) as elapsed_hours, rows_processed, round(cpu_time /elapsed_time * 100) as cpu_time_pctround(iowait time /elapsed time * 100) as iowait pct, round(iowait_time /elapsed_time 100) as iowait_pct

, LIO, PIO, direct_writes, round(iowait_time /PIO/1000,1) as mili_sec_PIO

FROM(SELECT PLAN_HASH_VALUE, sum(EXECUTIONS DELTA) as executions, sum(EXECUTIONS_DELTA) as executions, sum(ROWS_PROCESSED_DELTA) as rows_processed, sum(ELAPSED_TIME_DELTA) as elapsed_time, sum(CPU_TIME_DELTA) as cpu_time, sum(IOWAIT_DELTA) as iowait_time, sum(DIRECT_WRITES_DELTA) as direct_writes, sum(BUFFER_GETS_DELTA) as LIO, sum(DISK_READS_DELTA) as PIO

FROM dba_hist_sqlstatWHERE snap_id between 132042 and 132124

AND sql_id = 'dkwucgaxxhm2z'GROUP BY sql id, PLAN HASH VALUE);q _ , _ _ );

an CPU IO Milisecsh Elapsed Rows TIME WAIT Direct /ue EXECUTIONS Hours Processed PCT PCT LIO PIO Writes Pio-- ---------- -------- ---------- ----- ---- ---------- ---------- -------- -------34 1 20.5 5,997,889 1 99 36,152,215 6,427,679 219,418 11.4

AWR SQL Optimizer Env valuesect * from table(dbms xplan display awr('dkwucgaxxhm2z' 1700726234 nullect * from table(dbms_xplan.display_awr( dkwucgaxxhm2z , 1700726234, null, LAST +OUTLINE'));

------------------------------------------------------------------------------------------------------Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |------------------------------------------------------------------------------------------------------SELECT STATEMENT | | | | | 9553K(100)| |SELECT STATEMENT | | | | | 9553K(100)| |NESTED LOOPS OUTER | | 8011K| 46G| | 9553K (1)| 31:50:39 |

DataData------

EGIN_OUTLINE_DATAGNORE_OPTIM_EMBEDDED_HINTS_ _ _PTIMIZER_FEATURES_ENABLE('11.1.0.7')B_VERSION('11.1.0.7')PT_PARAM('_b_tree_bitmap_plans' 'false')PT_PARAM('_optim_peek_user_binds' 'false')PT PARAM('optimizer index cost adj' 10)PT_PARAM( optimizer_index_cost_adj 10)LL_ROWSUTLINE_LEAF(@"SEL$335DD26A")ERGE(@"SEL$3")

AWR SQL plan-------------------------------------------------------------------------------------------------------------peration | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |-------------------------------------------------------------------------------------------------------------ELECT STATEMENT | | | | | 9553K(100)| |NESTED LOOPS OUTER | | 8011K| 46G| | 9553K (1)| 31:50:39 |NESTED LOOPS OUTER | | 8011K| 45G| | 7148K (1)| 23:49:40 | NESTED LOOPS OUTER | | 8011K| 45G| | 4743K (1)| 15:48:44 | NESTED LOOPS OUTER | | 8011K| 45G| | 3941K (1)| 13:08:24 | NESTED LOOPS OUTER | | 8011K| 44G| | 3140K (1)| 10:28:03 || | | | | ( )| | HASH JOIN RIGHT OUTER | | 8011K| 44G| | 2338K (1)| 07:47:43 | VIEW | index$_join$_009 | 6633 | 285K| | 39 (3)| 00:00:01 | HASH JOIN | | | | | | | HASH JOIN | | | | | | | INDEX FAST FULL SCAN | S_SRC_M10 | 6633 | 285K| | 10 (0)| 00:00:01 | INDEX FAST FULL SCAN | S_SRC_M12 | 6633 | 285K| | 10 (0)| 00:00:01 | INDEX FAST FULL SCAN | S_SRC_P1 | 6633 | 285K| | 8 (0)| 00:00:01 | HASH JOIN RIGHT OUTER | | 8011K| 44G| 228M| 2338K (1)| 07:47:42 | TABLE ACCESS FULL | S_ORG_EXT_LSX | 7488K| 142M| | 38163 (2)| 00:07:38 | HASH JOIN RIGHT OUTER | | 8011K| 43G| | 51545 (1)| 00:10:19 | TABLE ACCESS FULL | S_INDUST_LANG | 4023 | 113K| | 199 (0)| 00:00:03 | HASH JOIN RIGHT OUTER | | 8011K| 43G| | 51289 (1)| 00:10:16 | TABLE ACCESS FULL | S_ORG_PRTNR | 324 | 43740 | | 8 (0)| 00:00:01 | NESTED LOOPS OUTER | | 8011K| 42G| | 51224 (1)| 00:10:15 | VIEW | | 8011K| 42G| | 51169 (1)| 00:10:15 | NESTED LOOPS | | | | | | |

DirectWrites DirectWrites

NESTED LOOPS | | 8011K| 8091M| | 51169 (1)| 00:10:15 | INDEX FULL SCAN | SO_ANA_BU_U2 | 19 | 285 | | 1 (0)| 00:00:01 | INDEX RANGE SCAN | S_ORG_EXT_M91 | 74493 | | | 35 (3)| 00:00:01 | TABLE ACCESS BY INDEX ROWID| S_ORG_EXT | 421K| 419M| | 2693 (1)| 00:00:33 | TABLE ACCESS BY INDEX ROWID | S_OU_PRTNR_TYPE | 1 | 94 | | 1 (0)| 00:00:01 | INDEX UNIQUE SCAN | S_OU_PRTNR_TYPE_P1 | 1 | | | 1 (0)| 00:00:01 | TABLE ACCESS BY INDEX ROWID | S_ORG_EXT | 1 | 42 | | 1 (0)| 00:00:01 | INDEX UNIQUE SCAN | S_ORG_EXT_P1 | 1 | | | 1 (0)| 00:00:01 |

--------219,418

workarea_size_policy=manualhash area size=2147483647

--------219,418

workarea_size_policy=manualhash area size=2147483647_ _ _

TABLE ACCESS BY INDEX ROWID | S_ORG_EXT | 1 | 42 | | 1 (0)| 00:00:01 | INDEX UNIQUE SCAN | S_ORG_EXT_P1 | 1 | | | 1 (0)| 00:00:01 | TABLE ACCESS BY INDEX ROWID | S_ORG_EXT | 1 | 42 | | 1 (0)| 00:00:01 | INDEX UNIQUE SCAN | S_ORG_EXT_P1 | 1 | | | 1 (0)| 00:00:01 | TABLE ACCESS BY INDEX ROWID | S_ADDR_PER | 1 | 59 | | 1 (0)| 00:00:01 | INDEX UNIQUE SCAN | S_ADDR_PER_P1 | 1 | | | 1 (0)| 00:00:01 |TABLE ACCESS BY INDEX ROWID | S_ADDR_PER | 1 | 59 | | 1 (0)| 00:00:01 | INDEX UNIQUE SCAN | S_ADDR_PER_P1 | 1 | | | 1 (0)| 00:00:01 |

hash_area_size=2147483647hash_area_size=2147483647

_ _ _-------------------------------------------------------------------------------------------------------------

New SQL Planrom table(dbms_xplan.display_cursor(null, null, 'ALLSTATS LAST'));

------------------------------------------------------------------------------------------------------------------------------------------------------------ion | Name | Starts | E-Rows |E-Bytes| Cost (%CPU)| A-Rows | A-Time | Buffers | Reads | OMem | 1Mem | Used-Mem |------------------------------------------------------------------------------------------------------------------------------------------------------------STATEMENT | | 1 | | | 674K(100)| 0 |00:11:40.62 | 16M| 3031K| | | |

JOIN RIGHT OUTER | | 1 | 17M| 98G| 674K (2)| 5352K|01:20:42.29 | 16M| 3031K| 1143K| 1143K| 74M (0)| | index$_join$_010 | 1 | 6633 | 285K| 383 (1)| 6707 |00:00:01.93 | 749 | 725 | | | |

H JOIN | | 1 | | | | 6707 |00:00:01.93 | 749 | 725 | 1143K| 1143K| 73M (0)|SH JOIN | | 1 | | | | 6707 |00:00:01.07 | 680 | 659 | 1117K| 1117K| 73M (0)|NDEX FAST FULL SCAN | S SRC M10 | 1 | 6633 | 285K| 103 (0)| 6707 |00:00:00 08 | 338 | 328 | | | |NDEX FAST FULL SCAN | S_SRC_M10 | 1 | 6633 | 285K| 103 (0)| 6707 |00:00:00.08 | 338 | 328 | | | |NDEX FAST FULL SCAN | S_SRC_M12 | 1 | 6633 | 285K| 100 (0)| 6707 |00:00:00.17 | 342 | 331 | | | |DEX FAST FULL SCAN | S_SRC_P1 | 1 | 6633 | 285K| 76 (0)| 6707 |00:00:00.04 | 69 | 66 | | | |JOIN RIGHT OUTER | | 1 | 7460K| 41G| 674K (2)| 5352K|01:20:08.10 | 16M| 3030K| 1208M| 33M| 1455M (0)|

LE ACCESS FULL | S_ADDR_PER | 1 | 13M| 744M| 107K (2)| 14M|00:01:53.38 | 392K| 392K| | | |H JOIN RIGHT OUTER | | 1 | 7460K| 41G| 566K (2)| 5352K|01:17:16.78 | 16M| 2638K| 1208M| 33M| 1455M (0)|BLE ACCESS FULL | S_ADDR_PER | 1 | 13M| 744M| 107K (2)| 14M|00:02:21.69 | 392K| 392K| | | |SH JOIN RIGHT OUTER | | 1 | 7460K| 41G| 458K (2)| 5352K|01:14:39.07 | 15M| 2246K| 285M| 10M| 459M (0)|ABLE ACCESS FULL | S_ORG_EXT_LSX | 1 | 7488K| 142M| 38163 (2)| 6777K|00:01:55.31 | 173K| 138K| | | |ASH JOIN RIGHT OUTER | | 1 | 7460K| 40G| 420K (2)| 5352K|01:12:09.86 | 15M| 2107K| 445M| 18M| 606M (0)|| | | | | ( )| | : : | | | | | ( )|INDEX FAST FULL SCAN | S_ORG_EXT_W3 | 1 | 7068K| 276M| 26545 (1)| 6887K|00:04:56.19 | 154K| 102K| | | |HASH JOIN RIGHT OUTER | | 1 | 7460K| 40G| 393K (2)| 5352K|01:07:28.03 | 15M| 2005K| 445M| 18M| 606M (0)|INDEX FAST FULL SCAN | S_ORG_EXT_W3 | 1 | 7068K| 276M| 26545 (1)| 6887K|00:00:48.23 | 102K| 19057 | | | |HASH JOIN RIGHT OUTER | | 1 | 7460K| 40G| 367K (2)| 5352K|01:05:45.34 | 15M| 1986K| 445M| 18M| 606M (0)| INDEX FAST FULL SCAN | S_ORG_EXT_W3 | 1 | 7068K| 276M| 26545 (1)| 6887K|00:00:00.01 | 102K| 0 | | | | HASH JOIN RIGHT OUTER | | 1 | 7460K| 40G| 340K (2)| 5352K|01:05:35.55 | 15M| 1986K| 915K| 915K| 74M (0)| TABLE ACCESS FULL | S_INDUST_LANG | 1 | 4023 | 113K| 199 (0)| 4023 |00:00:00.04 | 713 | 709 | | | | HASH JOIN RIGHT OUTER | | 1 | 7460K| 39G| 340K (2)| 5352K|01:05:23.59 | 15M| 1985K| 899K| 899K| 74M (0)| TABLE ACCESS FULL | S_ORG_PRTNR | 1 | 324 | 43740 | 8 (0)| 319 |00:00:00.02 | 23 | 21 | | | |_ _ HASH JOIN RIGHT OUTER | | 1 | 7460K| 38G| 340K (2)| 5352K|01:05:23.46 | 15M| 1985K| 1593K| 1593K| 64M (0)| VIEW | index$_join$_014 | 1 | 1 | 94 | 1 (100)| 0 |00:00:00.06 | 3 | 2 | | | | HASH JOIN | | 1 | | | | 0 |00:00:00.06 | 3 | 2 | 1269K| 1269K| 64M (0)| INDEX FAST FULL SCAN| S_OU_PRTNR_TYPE_P1 | 1 | 1 | 94 | 0 (0)| 0 |00:00:00.02 | 3 | 2 | | | | INDEX FAST FULL SCAN| S_OU_PRTNR_TYPE_U1 | 0 | 1 | 94 | 0 (0)| 0 |00:00:00.01 | 0 | 0 | | | | VIEW | | 1 | 7460K| 38G| 340K (2)| 5352K|01:05:12.63 | 15M| 1985K| | | | HASH JOIN | | 1 | 7460K| 7527M| 340K (2)| 5352K|01:05:12.59 | 15M| 1985K| 1078K| 1078K| 72M (0)| INDEX FULL SCAN | SO_ANA_BU_U2 | 1 | 19 | 285 | 1 (0)| 19 |00:00:00.02 | 1 | 1 | | | | TABLE ACCESS FULL | S_ORG_EXT | 1 | 7068K| 7030M| 339K (2)| 6887K|01:05:18.93 | 15M| 1985K| | | |

------------------------------------------------------------------------------------------------------------------------------------------------------------

Evaluating the changes

CPU IO Milisecsh Elapsed Rows TIME WAIT Direct /ue EXECUTIONS Hours Processed PCT PCT LIO PIO Writes PIO-- ---------- ---------- ---------- ---- ---- ----------- ---------- -------- ----------34 1 20.5 5,997,889 1 99 36,152,215 6,427,679 219,418 11.4

CPU IO Milisecsh Elapsed Rows TIME WAIT Direct /ue EXECUTIONS Hours Processed PCT PCT LIO PIO Writes PIO-- ---------- ---------- ---------- ---- ---- ----------- ---------- -------- ----------41 1 1.3 5,352,381 5 96 13,134,981 2,651,076 0 2

educed elapsed time by 94%, Logical IO by 63% and Physical IO by 59%

ut increased IOPS by 6x => ensure that disk subsystem can handle it !!!

Use Case 2 – Find sql & stats

SQL for the time period

D SQL_TYPE SAMPLE_PCT HOURS-------- ---------- ---------- ----------0c9tdj80 INSERT 11 3.9gt7ytnm9 SELECT 9 3.2wkk6x5b5 INSERT 7 2.6

for SQL dvaxm0c9tdj80Plan CPU IO milisecHash Elapsed Rows time WAIT Direct /

Value executions Minutes processed PCT PCT LIO PIO Writes PIO--- ---------- ---------- -------- ---------- ---- ---- ----------- ---------- -------- ---------29 4061473922 1 118 9,289 1 99 449,940 406,585 0 17-30 4061473922 1 236 6,754 0 100 408,245 406,481 0 35, , ,-01 4061473922 1 89 352 1 99 406,564 406,349 0 13-02 4061473922 1 145 7,383 1 99 410,586 406,358 0 21-03 4061473922 1 220 13,944 1 100 413,684 406,027 0 32

Use Case 2 – SQL detailsLLan

lect * from table(dbms_xplan.display_awr('dvaxm0c9tdj80', 4061473922, null, LAST’));

------------------------------------------------------------------------- Operation | Name | Rows | Bytes | Cost (%CPU)| Time |------------------------------------------------------------------------- INSERT STATEMENT | | | | 24155 (100)| |

INDEX FULL SCAN | S PARTY W1 | 911K| 17M| 24155 (1)| 00 04 50 | INDEX FULL SCAN | S_PARTY_W1 | 911K| 17M| 24155 (1)| 00:04:50 |-------------------------------------------------------------------------

TextText

T /*+APPEND*/ INTO S_ETL_I_IMG_70 (ROW_ID, MODIFICATION_NUM, OPERATION, LAST_UPD)

T ROW_ID, 1, 'I', LAST_UPD S_PARTY S_PARTY.LAST_UPD > :1;

Use Case 2 – SQL rowsource

SQL_PLAN_LINE_ID EVENT PLAN_LINE_EVENT_PCT MINUTES------- ---------------- ------------------------- ------------------- ----------c9tdj80 2 db file sequential read 100 235c9tdj80 2 CPU 0 1

or SQL dvaxm0c9tdj80

Plan CPU IO milisecHash Elapsed Rows time WAIT Direct /

Value executions Minutes processed PCT PCT LIO PIO Writes PIO--- ---------- ---------- -------- ---------- ---- ---- ----------- ---------- -------- ---------29 4061473922 1 118 9,289 1 99 449,940 406,585 0 17-30 4061473922 1 236 6,754 0 100 408,245 406,481 0 35-01 4061473922 1 89 352 1 99 406,564 406,349 0 13-02 4061473922 1 145 7,383 1 99 410,586 406,358 0 21-03 4061473922 1 220 13,944 1 100 413,684 406,027 0 32

Use Case 2 – Index Structure@i S PARTY@i S_PARTY

Unq? Part? Index name STATUS Column name DATA_TYPE- ---- ------ ----------- -------- -------------- ---------L NO NO S PARTY F1 VALID PAR PARTY ID VARCHAR2L NO NO S_PARTY_F1 VALID PAR_PARTY_ID VARCHAR2

S_PARTY_M1 VALID ROOT_PARTY_FLG CHARp …NO NO S_PARTY_W1 VALID LAST_UPD DATE

VALID ROW ID VARCHAR2

t IO is 99% of elapsed time

U i f t i d b t

VALID ROW_ID VARCHAR2ut based on modified version of Tim Gorman’s script at w.evdbt.com/tool.htm

ext

T /*+APPEND*/ INTO S_ETL_I_IMG_70 (ROW_ID, MODIFICATION_NUM, OPERATION, LAST_UPD)

T ROW ID, 1, 'I', LAST UPD

Using perfect index, but wrong access method

Why does the CBO choose this inefficient plan ?!

B d t t ?_ _

S_PARTY S_PARTY.LAST_UPD > :1;

FULL SCAN | S_PARTY_W1

Bad stats? Incorrect optimizer settings? Or something else?

Use Case 2 – Replicate take 1plain plan forNSERT /*+APPEND*/ INTO S ETL I IMG 70NSERT /*+APPEND*/ INTO S_ETL_I_IMG_70

(ROW_ID, MODIFICATION_NUM, OPERATION, LAST_UPD)ELECT ROW_ID, 1, 'I', LAST_UPDROM S_PARTYHERE S_PARTY.LAST_UPD > :x;

ned.

lect * from table(dbms_xplan.display(null, null, 'ALLSTATS LAST'));p …--------------------------------------------------------------------------------------------------------------| Operation | Name | E-Rows |-------------------------------------------------------| INSERT STATEMENT | | 913K|| LOAD TABLE CONVENTIONAL | S_ETL_I_IMG_70 | || INDEX RANGE SCAN | S_PARTY_W1 | 913K|-------------------------------------------------------cate Information (identified by operation id):----------------------------------------------- access("S PARTY"."LAST UPD">:X)access( S_PARTY . LAST_UPD >:X)

Statistics HistoryWRI$_OPTSTAT_TAB_HISTORYWRI$_OPTSTAT_IND_HISTORYEtc.

Use Case 2 – bind data typelect distinct name was captured last capturedlect distinct name, was_captured, last_capturedsys.anydata.gettypename(value_anydata) as data_typesys.anydata.accesstimestamp(value_anydata) as data_valuerom DBA_HIST_SQLBIND where sql_id = 'dvaxm0c9tdj80’ order by last_captured;

wascaptured LAST_CAPTURED DATA_TYPE DATA_VALUE-------- ------------------------- -------------------- --------------------YES 2011-06-29 17:51:44 SYS.TIMESTAMP 2011-06-28 08:12:58YES 2011-06-30 18:16:03 SYS TIMESTAMP 2011-06-29 17:01:20YES 2011 06 30 18:16:03 SYS.TIMESTAMP 2011 06 29 17:01:20YES 2011-07-01 03:21:51 SYS.TIMESTAMP 2011-06-30 17:01:11YES 2011-07-02 17:59:52 SYS.TIMESTAMP 2011-07-01 03:03:19YES 2011-07-03 17:59:08 SYS.TIMESTAMP 2011-07-02 17:01:38

Unq? Part? Index name STATUS Column name DATA_TYPE- ---- ------ ----------- -------- -------------- ---------L NO NO S PARTY F1 VALID PAR PARTY ID VARCHAR2L NO NO S_PARTY_F1 VALID PAR_PARTY_ID VARCHAR2

S_PARTY_M1 VALID ROOT_PARTY_FLG CHARp …NO NO S_PARTY_W1 VALID LAST_UPD DATE

VALID ROW_ID VARCHAR2

Use Case 2 – Replicate (2nd try)eclareeclare x timestamp;

begin INSERT /*+APPEND*/ INTO S_ETL_I_IMG_70

(ROW ID MODIFICATION NUM OPERATION LAST UPD) (ROW_ID, MODIFICATION_NUM, OPERATION, LAST_UPD) SELECT ROW_ID, 1, 'I', LAST_UPD FROM S_PARTY WHERE S_PARTY.LAST_UPD > :x;

end;end;/

-------------------------------------------------------d | Operation | Name | E-Rows |d | Operation | Name | E Rows |-------------------------------------------------------0 | INSERT STATEMENT | | |1 | LOAD TABLE CONVENTIONAL | | |2 | INDEX FULL SCAN | S PARTY W1 | 913K|2 | INDEX FULL SCAN | S_PARTY_W1 | 913K|-------------------------------------------------------dicate Information (identified by operation id):------------------------------------------------2 - filter(INTERNAL FUNCTION("S PARTY"."LAST UPD")>:B1)2 filter(INTERNAL_FUNCTION( S_PARTY . LAST_UPD )>:B1)

Use Case 2: Visualizing the improvementp o e e t

IMG Process Duration

2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

ETL Day

Free script collections

• Tanel Poder• tech.e2sn.com/oracle-scripts-and-tools

• Kerry Osborne -• kerryosborne.oracle-guy.com/papers/my_favorite_scripts_2010.zip

• Tim Gorman• Tim Gorman• evdbt.com/tools.htm

• Adrian Billington• oracle-developer.net/utilities.php

• Jonathan Lewis• jonathanlewis wordpress com/2009/12/18/simple scripts/• jonathanlewis.wordpress.com/2009/12/18/simple-scripts/

SQL Tuning Forms Tuning

ResourcesSQL Tuning

– Trace files– SQLT output (MOS Doc: 215187.1)– Trace Analyzer (MOS Doc :

Forms Tuning– Forms Tracing (MOS Doc : 373548.1)– Generic MOS Doc : 438652.1

Trace Analyzer (MOS Doc : 224270.1)

– AWR Report (MOS Doc : 748642.1)– AWR SQL Report (awrsqrpt.sql)

SQ

Reports Tracing– MOS Doc: 111311.1

– 11g Real-Time SQL Monitoring – SQL Tuning Advisor

PL/SQL Tuning

Database Tuning– AWR Report (MOS Doc : 748642.1)– ADDM report (MOS Doc : 250655.1)

PL/SQL Tuning– Product logs– PL/SQL Profiler (MOS Doc :

808005.1)

– Active Session History (ASH) Report – LTOM output (MOS Doc : 352363.1)

OS

Middletier Tuning– JVM Logs

OS– OSWatcher (MOS Doc : 301137.1)

– Third Party Tools

To learn even more

• Performance Fundamentals for Oracle Database 10g and 11g by Graham Wood and John Beresniewicz (http://www.oracle.com/technetwork/database/focus-areas/manageability/db-perf-tuning-ow08-131582.pdf)

• ASH website by Kyle Hailey (https://sites.google.com/site/embtdbo/wait-event-documentation/ash---active-session-history)

• Expert Oracle Database Architecture: Oracle Database 9i 10g• Expert Oracle Database Architecture: Oracle Database 9i, 10g, and 11g Programming Techniques and Solutions by Thomas Kyte

• Troubleshooting Oracle Performance by Christian Antognini

• Blogs• Blogs– Tanel Poder, Kerry Osborne, Jonathan Lewis, Cary Millsap, Greg

Rahn, Randolf Geist, etc.

Summary

• Ask questions• Understand the database internals• Understand the database internals • Use multiple tools depending on the situation• Combine the best of both (i e PerfSheet from TanelCombine the best of both (i.e. PerfSheet from Tanel

Poder)

Q&AQ&A

barunsql performance tuning with oracle ash awr real world use cases public

Documents