Re: Performance issues with SSD on DELL servers

  • From: Mladen Gogala <gogala.mladen@xxxxxxxxx>
  • To: Apps DBA <dbaorapps@xxxxxxxxx>
  • Date: Mon, 29 Aug 2016 08:31:14 -0400

On 08/29/2016 01:06 AM, Apps DBA wrote:

Hello Gogala/Amir,

Thanks for your response. I dont see any problem in the wait events,

EVENT                    COUNT(*) AVG(B.WAIT_TIME)
---------------------------------------- ---------- ----------------
VKTM Logical Idle Wait                            1                0
VKRM Idle                           1                0
smon timer                            1                0
JOX Jit Process Sleep                           1                0
AQPC idle                           1                0
direct path read temp                           1                0
lreg timer                            1                0
Streams AQ: emn coordinator idle wait             1                0
Streams AQ: qmn coordinator idle wait             1                0
wait for unread message on broadcast cha          1                0
nnel

heartbeat redo informer                           1                0
pmon timer                            1                0
Streams AQ: qmn slave idle wait                   2                0
LGWR worker group idle                            2                0
DIAG idle wait                            2                0
jobq slave wait                           2                0
Space Manager: slave idle wait                    3                0
EMON slave idle wait                            5                0
Streams AQ: waiting for time management           5                0
or cleanup tasks

rdbms ipc message                          16                0
pipe get                           21                0
Streams AQ: waiting for messages in the          29                0
queue

SQL*Net message from client                     187                0

23 rows selected.


I am not sure how this result was produced, by having 0 waiting time for all events suggests that your applications are running like a greased lightning.



I believe there is something wrong with network/storage. below find the Oswatcher netstat info.

Linux OSWbb v7.3.3
zzz ***Mon Aug 29 00:00:21 EDT 2016
Kernel Interface table
Iface MTU RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
eth0 1500 8803635 0 412 0 7038079 0 0 0 BMRU
eth1 9000 45572028 0 263 0 48337634 0 0 0 BMRU
lo 65536 7919428 0 0 0 7919428 0 0 0 LRU

Yes, dropped packets do suggest problems with network. That also suggests the issue with your query against V$SYSTEM_EVENTS, because network issues should have resulted in marked increase of waiting time for the network events.
Regards


--
Mladen Gogala
Oracle DBA
Tel:(347) 321-1217 <tel:%28347%29%20321-1217>




--
Mladen Gogala
Oracle DBA
Tel: (347) 321-1217

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