====== Problem with shared memory ======

If you have high swap space usage, or defunct processes, the stop all application and cleanup the shared memory segments, queues and semaphores
 
Remove defunct interprocess communication segments.

==== Memory ====

List all memory segments:
<cli prompt='$'>
$ ipcs -am | grep db2inst1

IPC status from  as of Thu Aug 30 13:16:55 2001
T      ID            KEY            MODE           OWNER          GROUP
Shared Memory:
m      9910          0x74006380     --rw-rw-rw-    db2inst1       db2grp
m      59714         0x61006380     --rw-------    db2inst1       db2grp 
</cli>

From the list above, you notice that there are two memory segments that were not removed when executing ipclean. You must remove them manually:
<cli prompt='$'>
$ ipcrm -m 9910
$ ipcrm -m 59714 
</cli>

==== Semaphore ====

List all semaphore segments:
<cli prompt='$'>
$ ipcs -as | grep db2inst1

IPC status from  as of Thu Aug 30 13:16:55 2001
T      ID          KEY          MODE         OWNER        GROUP
Shared Memory:
s      1900549     0x74006380   --ra-ra-ra-  db2inst1     db2grp   1
s      1310727     00000000     --ra-ra----  db2inst1     db2grp   1
s      2031624     0x73006380   --ra-ra-ra-  db2inst1     db2grp   1 
</cli>

From the list above, notice that there are three semaphore segments that were not removed after executing ipclean. You must remove them manually:
<cli prompt='$'>
$ ipcrm -s 1900549
$ ipcrm -s 1310727
$ ipcrm -s 2031624 
</cli>

==== Queues ====

List all message queue segments:
<cli prompt='$'>
$ ipcs -aq | grep db2inst1

IPC status from  as of Thu Aug 30 13:16:55 2001
T           ID         KEY         MODE         OWNER     GROUP
Shared Memory:
q           1572868    0x01dadd16  -Rrw-------  db2inst1  db2grp 65535
q           901125     0x01eba5ed  --rw-------  db2inst1  db2grp 65535
q           1609739    00000000    --rw-------  db2inst1  db2grp 65535
q           659468     00000000    -Rrw-------  db2inst1  db2grp 65535 
</cli>

From the list above, notice that there are four message queue segments that were not removed after executing ipclean. You must remove them manually:
<cli prompt='$'>
$ ipcrm -q 1572868
$ ipcrm -q 901125
$ ipcrm -q 1609739
$ ipcrm -q 659468 
</cli>