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Vous avez vu ou entendu parler de la commande STRDBMON "Démarrer moniteur base données ".
Mais la difficulté, c'est souvent d'analyser les résultats obtenus, souvent n'ayant pas les outils !
Voici une liste de requêtes extraites d'un site IBM qui permettent d'interpréter ces résultats et souvent de trouver la réponse à vos questions.
*) Identify the most time consuming jobs
*) (can use QVC102 instead of QQUSER to group on current user):
SELECT SUM(qqi6) "Total Time", COUNT(*) "Total SQL Requests",
qqjnum,qqjob,qquser FROM ??File Name
WHERE qqrid=1000 AND qqc21 <> 'MT'
GROUP BY qqjob,qquser,qqjnum ORDER BY 1 DESC
*) Identify which type of SQL operations account for
the most run time:
SELECT SUM(qqi6) "Total Time", COUNT(*) "Nbr of Requests",
qqc21 "Operation Type" FROM ??File Name
WHERE qqrid=1000 AND qqc21 <> 'MT' AND qqjnum=??'xxxxxx'
GROUP BY qqc21 ORDER BY 1 DESC
*) Which SQL statements account for the most run time:
SELECT SUM(qqi6) "Total Time" , COUNT(*) "Nbr Times Run", qq1000
FROM ??File Name
WHERE qqjnum=??'xxxxxx' AND qqrid=1000 AND qqucnt<>0
AND qqc21<>'MT'
GROUP BY qq1000 ORDER BY 1 DESC
*) Which SQL statements are the longest running
*) (include Fetch & Close time with SELECT statement):
WITH ExecTime AS (SELECT qqjfld, sum(qqi6)
AS exectot FROM ??File Name
WHERE qqrid=1000 AND
(qqc21 IN ('SI','OP','FE','CL','IN','UP','DL')
OR (qqucnt>0 AND qqc21 IN('SV','VI') )) GROUP BY qqjfld),
StmtText AS (SELECT DISTINCT qqjfld, qq1000L FROM ??File Name
WHERE qqrid=1000 AND (qqc21 IN ('SI','OP','IN','UP','DL')
OR (qqucnt>0 AND qqc21 IN('SV','VI') )) )
SELECT sum(x.exectot) "Total Time", s.qq1000L
FROM ExecTime x, StmtText s
WHERE x.qqjfld = s.qqjfld GROUP BY s.qq1000L ORDER BY 1 DESC
*) Which SQL statements are the longest running and how many
times have they been
*) executed (include Fetch & Close time with SELECT statement):
WITH ExecTime AS (SELECT qqjfld, sum(qqi6) AS exectot FROM
??File Name WHERE qqrid=1000 AND
(qqc21 IN ('SI','OP','FE','CL','IN','UP','DL')
OR (qqucnt>0 AND qqc21 IN('SV','VI') )) GROUP BY qqjfld) ,
StmtText AS (SELECT DISTINCT qqjfld, qq1000L FROM
??File Name WHERE qqrid=1000 AND (qqc21 IN
('SI','OP','IN','UP','DL')
OR (qqucnt>0 AND qqc21 IN(�SV','VI')))),
StmtCnt AS (SELECT qq1000L, count(*) AS cntr FROM
??File Name WHERE qqrid=1000 AND
(qqc21 IN ('SI','OP','FE','CL','IN','UP','DL')
OR (qqucnt>0 AND qqc21 IN('SV','VI') ))
GROUP BY qq1000L) SELECT sum(x.exectot)
"Total Time", max(cntr) "Nbr Times Run", s.qq1000L
FROM ExecTime x, StmtText s, StmtCnt c
WHERE x.qqjfld = s.qqjfld AND s.qq1000L = c.qq1000L
GROUP BY s.qq1000L ORDER BY 1 DESC
*) Which queries involve table scans and show the
"Estimated rows
*) selected" versus "Total rows in tables":
WITH tablescans AS (SELECT DISTINCT qqjfld, qqucnt,
qqrest,qqtotr FROM ??File Name
WHERE qqrid=3000)
SELECT SUM(qqi6) "Total Time", COUNT(*) "Times Run",
a.qqucnt, integer(avg(b.qqrest)) "Est Rows Selected",
integer(avg(b.qqtotr)) "Total Rows in Table", qq1000
FROM ??File Name a, tablescans b WHERE
qqrid=1000 AND a.qqjfld = b.qqjfld AND qqc21 IN
('OP','SI','SV','UP','IN','DL')
GROUP BY a.qqucnt, qq1000 ORDER BY 1 DESC
*) Which indexes are advised the most often?
SELECT qqucnt, qvqtbl "Table Name", qvqlib "Schema",
qqi2 "Nbr of Primary Keys", SUBSTR(qqidxd, 1,100) "Keys Advised"
FROM ??File Name
WHERE qqrid IN (3000, 3001, 3002) and qqidxa='Y' ORDER BY 5,2
*) Which index builds are done the most often?
SELECT qqucnt, qqc16 "Index Reused" qvptbl "Table Name",
qvplib "Schema", qqtotr "Rows in Table",
qqridx "Entries in Index",
qq1000L "Key Fields" FROM ??File Name
WHERE qqrid=3002 AND qqjnum=??'xxxxxx'
ORDER BY qqridx DESC
*) Which queries had access plans rebuilt?
WITH rebuilds AS (SELECT DISTINCT qqjfld, qqucnt, qqrcod
FROM qgpl.snapshot1 WHERE qqrid=3006 )
SELECT a.qqucnt, a.qqrcod "Rebuild Reason",
qvc24 "Plan Saved Status", qq1000 FROM qgpl.snapshot1 a,
rebuilds b WHERE a.qqjfld=b.qqjfld AND qqrid=1000
AND qqc21 NOT IN ('MT','FE','CL','HC') ORDER BY 4, 1
*) Which queries were processed by SQE vs CQE?
(QQC16='Y' implies SQE, 'N'= CQE)
SELECT qqc16, COUNT(*) FROM ??File Name
WHERE qqrid=3014 GROUP BY qqc16
*) Which column statistics have been advised by SQE?
SELECT qqucnt, qvqtbl "Table", qvqlib "Schema",
qqc11"Reason Stat Advised", SUBSTR(qq1000,1,100) "Column name"
FROM ??File Name
WHERE qqrid=3015
ORDER BY 2,5
*) Analyze I/O activity for most time consuming SQL
statements: WITH retrieved AS
(SELECT qqjfld, qqi3, qqi5 FROM ??File Name
WHERE qqrid=3019 ) SELECT SUM(qqi6) "Total Time" ,
COUNT(*) "Nbr Times Run",
SUM(b.qqi3) "Sync DB Reads", SUM((b.qqi5) "ASync DB Reads",
qq1000 FROM ??File Name a, retrieved b
WHERE a.qqjfld=b.qqjfld AND qqrid=1000
AND qqucnt<>0 AND qqc21<>'MT'
GROUP BY qq1000 ORDER BY 1 DESC
*) Which SQL requests are significantly affected by Full Opens:
SELECT SUM(qqi6) "Total Time" , COUNT(*) "Nbr Full Opens",
qq1000 FROM ??File Name
WHERE qqjnum=??'xxxxxx' AND qqrid=1000 AND qqi5=0
AND (qqc21 IN ('OP','SI','DL','IN','UP')
OR (qqucnt>0 AND qqc21 IN('SV','VI')))
GROUP BY qq1000 ORDER BY 1 DESC
*) What are the reasons causing the Full Opens:
SELECT qqc21, qqc15 "HC Reason", qqc23 "HC Subcode",
COUNT(*) "HC Count" FROM ??File Name
WHERE qqrid=1000 AND qqc21 IN ('HC','IN','UP','DL') AND
qqc15>'' AND qqc23>'' AND qqjnum= ??'xxxxxx'
GROUP BY qqc21, qqc15, qqc23 ORDER BY 1
*) How long are the stored procedure calls running and how many
*) SQL operations are being performed during the calls
(Replace QQC103 with QVC1282 to return the "long"
SQL Procedure Name)?
SELECT qqc104 AS "Proc Schema", qqc103 AS "Procedure" ,
SUM (qqi6) "Total Time" , COUNT (*) "Nbr of Requests" ,
qqc21 "Operation Type" FROM ??File Name
WHERE qqrid=1000 AND qqc21<>'MT' AND qqc103<> ' '
GROUP BY qqc104, qqc103, qqc21 ORDER BY 1,2,5
*) Which SQL instances (QQUCNT) account for the most run time ?
SELECT SUM(qqi6) "Total Time" , COUNT(*) "Nbr Times Run", qqucnt
FROM ??File Name
WHERE qqjnum=??'xxxxxx' AND qqrid=1000 AND qqucnt<>0
AND qqc21<>'MT'
GROUP BY qqucnt ORDER BY 1 DESC
*) Which SQL instances (QQUCNT & text) account for
the most run time ?
SELECT SUM(qqi6) "Total Time" , COUNT(*) "Nbr Times Run",
qqucnt, qq1000
FROM ??File Name
WHERE qqjnum=??'xxxxxx' AND qqrid=1000 AND qqucnt<>0
AND qqc21<>'MT'
GROUP BY qqucnt, qq1000 ORDER BY qqucnt, 1 DESC
*) Which queries involve use of a query sort?
WITH sorts AS (SELECT qqjfld, qqucnt FROM ??File Name
WHERE qqrid=3003 )
SELECT SUM(qqi6) "Total Time" , COUNT(*) "Nbr Times Run",
a.qqucnt, qq1000
FROM ??File Name a, sorts b
WHERE qqrid=1000 AND a.qqjfld=b.qqjfld
GROUP BY a.qqucnt,qq1000 ORDER BY 1 DESC
*) Analyze I/O & CPU activity for most frequently
run SQL statements:
WITH listSQL AS (SELECT DISTINCT qqjfld, qq1000L
FROM ??File Name WHERE qqrid=1000 AND
(qqc21 IN ('SI','OP','IN','UP','DL')
OR (qqucnt>0 AND qqc21 IN('SV','VI') )) )
SELECT COUNT(*) timesrun, SUM(a.qqi1) cpums,
SUM(a.qqi2) elpms, SUM(a.qqi3) synrds,
SUM(a.qqi4) synwrts, SUM(a.qqi5) asyrds,
SUM(a.qqi6) asywrts, SUM(a.qqi7) rowsread,
SUM(a.qqi8) as readcalls,
qq1000L FROM ??File Name a, listSQL b
WHERE a.qqjfld=b.qqjfld AND a.qqrid=3019
GROUP BY b.qq1000L ORDER BY 1 DESC
*) Which non-SQL queries are the most time consuming?
WITH retrieved AS (SELECT qqjfld, qqucnt, qqi2,qqi7
FROM ??File Name WHERE qqrid=3019 )
SELECT (qqi1+b.qqi2) "Total Query Time",
b.qqi7 "Number Rows Retrieved", qqc101 "Open ID", qquser
FROM ??File Name a, retrieved b
WHERE a.qqjfld=b.qqjfld AND qqrid=3014
ORDER BY 1 DESC
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