| From: | Vijaykumar Jain <vijaykumarjain(dot)github(at)gmail(dot)com> |
|---|---|
| To: | Yambu <hyambu(at)gmail(dot)com> |
| Cc: | Pgsql-admin <pgsql-admin(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: WALWriteLock |
| Date: | 2021-07-06 14:28:35 |
| Message-ID: | CAM+6J96Ofhc=WE1JLZfZQq54JP8v2ztFBb--wC+LVR4eZwueQA@mail.gmail.com |
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| Thread: | |
| Lists: | pgsql-admin |
On Tue, Jul 6, 2021, 7:54 PM Vijaykumar Jain <
vijaykumarjain(dot)github(at)gmail(dot)com> wrote:
>
> On Tue, Jul 6, 2021, 7:44 PM Yambu <hyambu(at)gmail(dot)com> wrote:
>
>> Hello
>>
>> I'm seeing a lot of WALWriteLocks , is this a bad sign , what might cause
>> this?
>>
>
> pg version
> cloud or on prem
> When do you see this piling up? Heavy concurrent usage or regular usage
> but random spike in locks?
> Underlying storage shows any anomalies?
> resource utilization normal or high?
> pg part of master replica setup with synchronous replication or async ?
> Disk iowait high?
>
Also, is it during checkpointing ?
how much is the checkpoint spread,
You can enable logging checkpoints,
to help relate correlation between checkpoint windows and walwrite locks
piling up ?
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