Will setting max_parallel_workers_per_gather to 0 (In fact, no parallel queries) Solve this issue? I can sustain the slowness. We are on 11.5, and the fix is on 11.6. -----Original Message----- From: Tom Lane <tgl@xxxxxxxxxxxxx> Sent: Sunday, May 03, 2020 5:37 PM To: Abraham, Danny <danny_abraham@xxxxxxx> Cc: pgsql-general@xxxxxxxxxxxxxx Subject: [EXTERNAL] Re: Very frequent "Too many clients" eventually crashes postmaster "Abraham, Danny" <danny_abraham@xxxxxxx> writes: > Is there a way to eliminate postmaster crash/core ? > A surge in short-term connections eventually crashes PG on "no free slots in PMChildFlags array". Update to a current release, maybe? We fixed a bug with symptoms like that last fall [1]. regards, tom lane [1] https://urldefense.proofpoint.com/v2/url?u=https-3A__git.postgresql.org_gitweb_-3Fp-3Dpostgresql.git-26a-3Dcommitdiff-26h-3D3887e9455&d=DwIFAg&c=UrUhmHsiTVT5qkaA4d_oSzcamb9hmamiCDMzBAEwC7E&r=rZ6QRG5QsrF-veoN0_ehDrT6IsQzka7-fVfEhCfor3I&m=LoZHLvaRhw48Dvx9n1OtgDV_SA0hse7hNTIl0fZh0RQ&s=u3c5XpUBsGhiPxGk5KFwOO_Aj-ToS4YN4pPBuVVZRGI&e=
