3 Replies Latest reply on Apr 8, 2019 2:55 AM by Geoff Grandstaff-Oracle

    Reverse Offload to DB servers

    Arturo Gutierrez
    Arturo Gutierrez Apr 5, 2019 9:14 AM

      Hi,

      Is possible to know the number of times a reverse offload to database servers happen?

      Any statistic at cell or database node available?

       

      Thanks

      Arturo

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        • 1. Re: Reverse Offload to DB servers
          Geoff Grandstaff-Oracle
          Geoff Grandstaff-Oracle Apr 5, 2019 4:06 PM (in response to Arturo Gutierrez)

          Hi, Arturo.

           

          cellsrvstat (on each individual cell) has a section for 'Reverse Offload related stats'. Ex:

           

          == Reverse Offload related stats ==
Number of Remote Nodes                            (I)          0              7
Number of Remote Instances                        (I)          0              8
Current Cell CPU utilization                      (I)          0              1
Number of requests                                (C)          0      31330706
Number of requests that were pushed              (C)          0        2085719
Average pushback rate for since last stat update  (I)          0              0
Average pushback rate for last 200 ms            (I)          0              0
Num of reqs not pushed due to low cell cpu        (C)          0      19360302
Num of reqs not pushed due to high cell outnet    (C)          0              0
Num of reqs not pushed due to high db node innet  (C)          0              0
Num rate increase by reverse offload info from db (C)          0          36398
Num rate decrease by reverse offload info from db (C)          0        316093
Num rate increases from db node cpu information  (C)          0          58745
Num rate decreases from db node cpu information  (C)          0          7437
Num rate decreases from low cell cpu utilization  (C)          0      552905618
Num rate decreases from high cell outnet util    (C)          0              0
Num rate decreases from high db node innet util  (C)          0              0

           

           

          Also, while not a "count", there is also the statistic 'cell physical IO bytes sent directly to DB node to balance CPU'.

           

          https://docs.oracle.com/en/engineered-systems/exadata-database-machine/sagug/exadata-storage-server-monitoring.html#GUID…

           

          Hope this helps.

           

          Regards,

           

          Geoff

          • 2. Re: Reverse Offload to DB servers
            Arturo Gutierrez
            Arturo Gutierrez Apr 7, 2019 8:04 PM (in response to Geoff Grandstaff-Oracle)

            Hi Geoff,

            Thanks for the reply.

             

            I've generated the report with Exawatcher.

            I think that this stats are the main:

            Num of reqs not pushed due to low cell cpu        (C)           0              0

            Num of reqs not pushed due to high cell outnet    (C)           0              0

            Num of reqs not pushed due to high db node innet  (C)           0              0

             

            Means, that no reverse offloading is ocurring.

             

            Thanks

            Arturo

            • 3. Re: Reverse Offload to DB servers
              Geoff Grandstaff-Oracle
              Geoff Grandstaff-Oracle Apr 8, 2019 2:55 AM (in response to Arturo Gutierrez)

              Hi, Arturo.

               

              As you probably noticed from the output I posted from cellsrvstat and what you posted with Exawatcher, cellssrvstat is one of the collectors for Exawatcher.

               

              https://docs.oracle.com/en/engineered-systems/exadata-database-machine/sagug/exadata-storage-server-maintaining.html#GUI…

               

              Have a great day.

               

              Regards,

               

              Geoff