DB2 監控動態SQL語句

一、db2監控動態sql（快照監控）

db2示例使用者登陸後，使用指令碼語句db2 get snapshot for all ondbname>snap.out

也可以使用db2 get snapshot for dynamic sql ondbname>snap.out,此語句是只記錄上一語句中的部分

tips：如果需要監控盡可能多的sql語句，建議增加dbm配置引數

以下是動態sql快照

dynamic sql snapshot result

database name = qindb
database path = /db2home/db2inst1/db2inst1/node0000/sql00002/
number of executions = 3 --編譯次數，為累加值
number of compilations = 1 --sql語句編譯的最長時間
worst preparation time (ms) = 87
best preparation time (ms) = 87
internal rows deleted = not collected
internal rows inserted = not collected
rows
read = not collected
internal rows updated = not collected
rows written = not collected
statement sorts = not collected
statement sort overflows = not collected
total sort time = not collected
buffer pool data logical reads = not collected
buffer pool data physical reads = not collected
buffer pool temporary data logical reads = not collected
buffer pool temporary data physical reads = not collected
buffer pool index logical reads = not collected
buffer pool index physical reads = not collected
buffer pool temporary
index logical reads = not collected
buffer pool temporary
index physical reads = not collected
buffer pool xda logical reads = not collected
buffer pool xda physical reads = not collected
buffer pool temporary xda logical reads = not collected
buffer pool temporary xda physical reads = not collected
total execution time (sec.microsec)= not collected --sql語句的總執行時間
total user cpu time (sec.microsec) = not collected
total system cpu time (sec.microsec)= not collected
total statistic fabrication time (milliseconds) = not collected
total synchronous runstats time (milliseconds) = not collected
statement text = select * from len.cust_info where cust_id like '%09' --sql語句文字

rows read :可以幫助識別讀取行數最多的動態sql語句，如果讀取行數最多，通常意味著進行全表掃瞄。

total execution time:是將語句每次執行時間加起來得到的總時間，我們可以利用該時間除以number of executrtions,可以得到平均執行時間。如果語句的平均執行時間很長，可能是因為表掃瞄或者出現鎖等待。

基於上述使用語句db2 get snapshot for all on dbname生成的文字內容，我們可以使用grep對快照的輸出內容執行搜尋

例如：<1> 識別是否存在死鎖

grep -n "deadlocks detected" snap.out |grep -v "= 0" |more

grep -n "number of executions" snap.out | grep -v "= 0" | sort -k 6rn |more

grep -n "total execution time" snap.out | grep -v "= 0.0"| sort -k 6nr| more

db2top –ddbname

按d，進入到sql監控介面(如果沒開大寫，可以使用shift+d)

按z，倒序排序

輸入排序列的序號，從0開始

按l，輸入sql的序列號，檢視sql明細

以下為示例操作：

（2）按d進入

（3）按z倒序排序，此處我輸入3，表示按照執行時間排序

（4）按l輸入sql序列號，檢視sql詳細

從上圖我們就可以檢視sql詳細了

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