On 2024-Feb-02, James Pang (chaolpan) wrote:
> Possible to increase Subtrans SLRU buffer size ?
Not at present -- you need to recompile after changing
NUM_SUBTRANS_BUFFERS in src/include/access/subtrans.h,
NUM_MULTIXACTOFFSET_BUFFERS and NUM_MULTIXACTMEMBER_BUFFERS in
src/include/access/multixact.h.
There's pending work to let these be configurable in version 17.
> Our case is 1) we use PL/PGSQL procedure1-->procedure2 (update
> table xxxx;commit); 2) application JDBC client call procedure1
> (it's a long running job, sometimes it could last > 1hours).
> During this time window, other Postgresql JDBC clients (100-200)
> coming in in same time , then quickly see MultiXactoffset and
> SubtransSLRU increased very quickly.
> PL/PGSQL proc1--> procedure2(updates table) it use substransation in
> procedure2 ,right?
If your functions/procedures use EXCEPTION clauses, that would create
subtransactions also.
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Álvaro Herrera Breisgau, Deutschland — https://www.EnterpriseDB.com/
"No deja de ser humillante para una persona de ingenio saber
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