Re: Backroom process tt00 top process

Thanks for this. However I am getting Permission denied errors even though I captured and running the perf script all as root

# perf script | ./stackcollapse-perf.pl | ./flamegraph.pl > TT.svg bash: ./stackcollapse-perf.pl: Permission denied bash: ./flamegraph.pl: Permission denied

On Tue, Apr 13, 2021 at 9:50 AM Laurentiu Oprea <laurentiu.oprea06_at_gmail.com> wrote:

> Hello Jeff,
>
> Yes you can kill the TT process and oracle will spawn a new one. But
> before doing that try this to see what is doing on CPU:
>
> perf record -g -F 99 --pid pid_number
> -> this will generate a perf.data file (let it run few minutes and hit
> ctrl-c)
> get : https://github.com/brendangregg/FlameGraph
> and run:
> perf script | ./FlameGraph-master/stackcollapse-perf.pl |
> ./FlameGraph-master/flamegraph.pl > TT.svg
> You can send the resultate flamegraph
>
>
> În mar., 13 apr. 2021 la 18:38, Jeff Chirco <backseatdba_at_gmail.com> a
> scris:
>
>> Thanks for those Doc IDs. Those look like they have a symptom of high
>> PGA usage. For me PGA is looking fine but this process is consuming high
>> CPU.
>> Would anything happen if I killed that session? Would another respawn?
>>
>> On Sun, Apr 11, 2021 at 9:10 PM Leng Burgess <lkaing_at_gmail.com> wrote:
>>
>>> Hi Jeff,
>>>
>>> Check out these bugs:
>>>
>>> Bug 28831971 - PGA Memory Leak On Background Processes Such As MMNL TT00
>>> Or +APX (Doc ID 28831971.8)
>>> Bug 30719327 - PGA memory leak in TT00, MMNL, and other background
>>> process with patch 28831971 APPLIED (Doc ID 30719327.8)
>>>
>>> HTH,
>>>
>>> Leng.
>>>
>>> > On 10 Apr 2021, at 6:08 am, Jeff Chirco <backseatdba_at_gmail.com> wrote:
>>> >
>>> > I am running TOP and I am seeing ora_tt00 backroom process at the top
>>> of list consistently (sorting by CPU), I mean it is at the top steadily. I
>>> understand that this has something to do with Redo Transport but I am not
>>> sure in what regards and if there is anything I can or should do about it.
>>> I have 2 databases on this same server both running Data Guard but this
>>> process is showing for only one of the databases. I think both databases
>>> are kind of equal on activity.
>>> >
>>> > Anything else I should be looking at?
>>> >
>>> > Thanks,
>>> > Jeff
>>>
>>>

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