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Monitoring performance with SQL -Lock wait time Appl

query to report on the lock wait statistics of currently connected applications.

 

 

db2 "select substr(ai.appl_name,1,20) as appl_name , \
substr(ai.primary_auth_id,1,10) as auth_id , ap.agent_id as app_handle,\
ap.lock_waits as lock_waits, ap.lock_wait_time / 1000 as Total_Wait_S, \
(ap.lock_wait_time / ap.lock_waits ) as Avg_Wait_ms \
from sysibmadm.snapappl_info ai, sysibmadm.snapappl ap \
where ai.agent_id = ap.agent_id and ap.lock_waits > 0"

 

APPL_NAME    AUTH_ID    APPL_HANDLE          LOCK_WAITS     TOTAL_WAIT_S     AVG_WAIT_MS
-------------------- ---------- ---   ------------------------ -    ---------------  -------------------- --------------------
pmrepagent           INFOD                      356                            3                    0                    0
pmrepagent           INFOD                      537                            5                    0                    2
pmrepagent           INFOD                      739                          10                   0                    6
pmrepagent           INFOD                      456                          13                   0                    2
pmrepagent           INFOD                      108                          16                   0                    3
pmrepagent           INFOD                      215                          14                   0                    4
pmrepagent           INFOD                      793                          12                   0                    2
pmrepagent           INFOD                      141                           11                   0                    4
pmrepagent           INFOD                      314                          27                   1                   53

 

If an application is either waiting on locks very frequently or the total wait time is very high (which
may indicate a single very long wait), you should drill down more on the application (show
the statement) and look at the lock chains to see which application is the holder of the locks
that this application is waiting on. Changing the application that is holding the lock to
Commit more frequently may solve the lock wait problems

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