1. MON_GET_PKG_CACHE_STMT
Tips for Finding Problem SQL

2. MON_GET Table Functions
Introduced in 9.7
Lightweight monitoring interface
IBM’s strategic direction for monitoring
Access data with SQL
No reset – start when database is activated
Can emulate reset with this methodology:
Consider extending the reset methodology with history tables

3. MON_GET_PKG_CACHE_STMT
Information from the package cache
Data on what is currently in the package cache
Can be exceptionally large if PCKCACHESZ is set to AUTOMATIC
Data from SNAPSHOT FOR DYNAMIC SQL and more
Includes data on static SQL

4. Using the MON_GET_PKG_CACHE_STMT Table Function
Parameters passed to MON_GET_PKG_CACHE_STMT:
section_type
executable_id
search_args
member
Example FROM clause:
FROM TABLE(MON_GET_PKG_CACHE_STMT ( 'D', NULL, NULL, -2)) AS T

5. SQL Example #1:
WITH SUM_TAB (SUM_RR) AS ( SELECT FLOAT(SUM(ROWS_READ)) FROM TABLE(MON_GET_PKG_CACHE_STMT ( 'D', NULL, NULL, -2)) AS T) SELECT SUBSTR(STMT_TEXT,1,20) AS STATEMENT, ROWS_READ, DECIMAL(100*(FLOAT(ROWS_READ)/SUM_TAB.SUM_RR),5,2) AS PCT_TOT_RR, ROWS_RETURNED, CASE WHEN ROWS_RETURNED > 0 THEN DECIMAL(FLOAT(ROWS_READ)/FLOAT(ROWS_RETURNED),10,2) ELSE -1 END AS READ_EFFICIENCY, NUM_EXECUTIONS FROM TABLE(MON_GET_PKG_CACHE_STMT ( 'D', NULL, NULL, -2)) AS T, SUM_TAB ORDER BY ROWS_READ DESC FETCH FIRST 10 ROWS ONLY WITH UR;

6. Query Output STATEMENT ROWS_READ PCT_TOT_RR ROWS_RET READ_EFF #_EXEC
SELECT T1.ORDIADJUST
59.75
198
2526
SELECT T1.MARKFORDEL
515936
6.01
32246
16.00
SELECT T1.CATGROUP_I
411133
4.79
1.00
SELECT T1.CATENTRY_I
408720
4.76
104
Select srchattr.srch
360162
4.19
40125
8.97
321
SELECT T0.PX_PROMOTI
203140
2.36
-1.00
4239
SELECT T1.TIMECREATE
128140
1.49
44240
2.89
110600
SELECT JURST_ID FROM
119340
1.39
109
306
SELECT stl.IDENTIFIE
110528
1.28
23896
4.62
1173
SELECT INSRULE.INSRU
98280
1.14
273

7. SQL Example #2:
WITH SUM_TAB (SUM_CPU) AS ( SELECT FLOAT(SUM(TOTAL_CPU_TIME)) FROM TABLE(MON_GET_PKG_CACHE_STMT ( 'D', NULL, NULL, -2)) AS T) SELECT SUBSTR(STMT_TEXT,1,20) AS STATEMENT, TOTAL_CPU_TIME, DECIMAL(100*(FLOAT(TOTAL_CPU_TIME)/SUM_TAB.SUM_CPU),5,2) AS PCT_TOT_CPU, DECIMAL(FLOAT(TOTAL_CPU_TIME)/FLOAT(NUM_EXECUTIONS),10,2) AS AVG_CPU_TIME_PER_EXE, NUM_EXECUTIONS FROM TABLE(MON_GET_PKG_CACHE_STMT ( 'D', NULL, NULL, -2)) AS T, SUM_TAB ORDER BY TOTAL_CPU_TIME DESC FETCH FIRST 10 ROWS ONLY WITH UR;

8. Query Output STATEMENT TOT_CPU_TIME PCT_TOT _CPU AVG_CPU_ TIME_PER_EXE
NUM_EXEC
SELECT-T1.CATGROUP_I
27.07
64.81
442845
SELECT-T1.TIMECREATE
26.15
241.92
114605
SELECT-T0.PX_PROMOTI
2.22
540.09
4373
SELECT-T1.ORDIADJUST
1.88
708.50
2827
SELECT-T1.MARKFORDEL
1.86
58.46
33848
INSERT-INTO-DBAMON09
1.51 18
1.40
528.96
2808
1.11
78.99
14961
SELECT-CATFILTER.CAT
1.05
165.10
6788
995825
0.93
43.18
23060

9. Vote for Ember! Blog: http://db2commerce.com Twitter: @ember_crooks
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Useful links on this topic:
Emulating Monitor Reset:
Info Center page on MON_GET:
My developerWorks article on mining the package cache: