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参考sql server 更新统计信息算法，优化大表无法及时vacuum 文档 #537

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参考sql server 更新统计信息算法，优化大表无法及时vacuum 文档 #537

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6 changes: 3 additions & 3 deletions src/backend/postmaster/autovacuum.c
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Original file line number Diff line number Diff line change
Expand Up @@ -108,7 +108,7 @@
#include "utils/syscache.h"
#include "utils/timeout.h"
#include "utils/timestamp.h"

#include <math.h>

/*
* GUC parameters
Expand Down Expand Up @@ -3128,9 +3128,9 @@ relation_needs_vacanalyze(Oid relid,
if (reltuples < 0)
reltuples = 0;

vacthresh = (float4) vac_base_thresh + vac_scale_factor * reltuples;
vacthresh = (float4) fmin(vac_base_thresh + vac_scale_factor * reltuples, vac_base_thresh + vac_scale_factor * sqrt(reltuples) * 1000.0 );
vacinsthresh = (float4) vac_ins_base_thresh + vac_ins_scale_factor * reltuples;
anlthresh = (float4) anl_base_thresh + anl_scale_factor * reltuples;
anlthresh = (float4) fmin(anl_base_thresh + anl_scale_factor * reltuples ,anl_base_thresh + anl_scale_factor * sqrt(reltuples) * 1000.0 );

/*
* Note that we don't need to take special consideration for stat
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