From 355ad170f2d3fa41a3a80e857b1641c5804d8728 Mon Sep 17 00:00:00 2001 From: Qiu Wenhui Date: Mon, 4 Nov 2024 08:16:10 +0000 Subject: [PATCH] optimize the value of vacthresh and anlthresh --- src/backend/postmaster/autovacuum.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c index dc3cf87..99259de 100644 --- a/src/backend/postmaster/autovacuum.c +++ b/src/backend/postmaster/autovacuum.c @@ -3038,10 +3038,15 @@ relation_needs_vacanalyze(Oid relid, /* If the table hasn't yet been vacuumed, take reltuples as zero */ if (reltuples < 0) reltuples = 0; - - vacthresh = (float4) vac_base_thresh + vac_scale_factor * reltuples; + /* Use arithmetic square root to solve auto vacuum trigger problem of large table */ + if (likely(reltuples > 500)) { + vacthresh = (float4) fmin(vac_base_thresh + (vac_scale_factor * reltuples) , sqrt(1000.0 * reltuples)); + anlthresh = (float4) fmin(anl_base_thresh + (anl_scale_factor * reltuples) , sqrt(1000.0 * reltuples)); + } else { + vacthresh = (float4) vac_base_thresh + vac_scale_factor * reltuples; + anlthresh = (float4) anl_base_thresh + anl_scale_factor * reltuples; + } vacinsthresh = (float4) vac_ins_base_thresh + vac_ins_scale_factor * reltuples; - anlthresh = (float4) anl_base_thresh + anl_scale_factor * reltuples; /* * Note that we don't need to take special consideration for stat -- 1.8.3.1