Re: Is it possible to change wal_level online
Hi, On September 14, 2023 6:21:59 AM PDT, Euler Taveira wrote: >On Thu, Sep 14, 2023, at 7:05 AM, Andy Fan wrote: >> Currently it is complained that wal_level changes require an instance >> restart, I'm not familiar with this stuff so far and I didn't get any good >> information from searching the email archive. So I want to gather >> some feedbacks from experts to see if it is possible and if not, why >> it would be the key blocker for this. Basically I agree that changing >> the wal_level online will be a good experience for users. >> > >This topic was already discussed. See this thread [1] that was requesting to >change the wal_level default value. There might be other threads but I didn't >try hard to find them. > > >[1] >https://www.postgresql.org/message-id/20200608213215.mgk3cctlzvfuaqm6%40alap3.anarazel.de I think it's gotten a bit easier since then, because we now have global barriers, to implement the waiting that's mentioned in the email. Possibly we should do the switch to logical dynamically, without a dedicated wal_level. Whenever a logical slot exists, automatically increase the Wal level, whenever the last slot is dropped, lower it again. Plus some waiting to ensure every backend has knows about the new value. Regards, Andres -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
Re: Is it possible to change wal_level online
On Thu, Sep 14, 2023 at 9:22 PM Euler Taveira wrote: > On Thu, Sep 14, 2023, at 7:05 AM, Andy Fan wrote: > > Currently it is complained that wal_level changes require an instance > restart, I'm not familiar with this stuff so far and I didn't get any good > information from searching the email archive. So I want to gather > some feedbacks from experts to see if it is possible and if not, why > it would be the key blocker for this. Basically I agree that changing > the wal_level online will be a good experience for users. > > > This topic was already discussed. See this thread [1] that was requesting > to > change the wal_level default value. There might be other threads but I > didn't > try hard to find them. > > > [1] > https://www.postgresql.org/message-id/20200608213215.mgk3cctlzvfuaqm6%40alap3.anarazel.de > Thank you Euler, this one is already the best one I ever found. -- Best Regards Andy Fan
Re: Is it possible to change wal_level online
On Thu, Sep 14, 2023, at 7:05 AM, Andy Fan wrote: > Currently it is complained that wal_level changes require an instance > restart, I'm not familiar with this stuff so far and I didn't get any good > information from searching the email archive. So I want to gather > some feedbacks from experts to see if it is possible and if not, why > it would be the key blocker for this. Basically I agree that changing > the wal_level online will be a good experience for users. > This topic was already discussed. See this thread [1] that was requesting to change the wal_level default value. There might be other threads but I didn't try hard to find them. [1] https://www.postgresql.org/message-id/20200608213215.mgk3cctlzvfuaqm6%40alap3.anarazel.de -- Euler Taveira EDB https://www.enterprisedb.com/
Is it possible to change wal_level online
Hi, Currently it is complained that wal_level changes require an instance restart, I'm not familiar with this stuff so far and I didn't get any good information from searching the email archive. So I want to gather some feedbacks from experts to see if it is possible and if not, why it would be the key blocker for this. Basically I agree that changing the wal_level online will be a good experience for users. -- Best Regards Andy Fan
