8000 Expand comment on how pg_upgrade is turning off autovacuum. · postgres/postgres@d609b08 · GitHub
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Expand comment on how pg_upgrade is turning off autovacuum.
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‎contrib/pg_upgrade/server.c

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@@ -172,7 +172,9 @@ start_postmaster(ClusterInfo *cluster, bool quiet)
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*
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* Using autovacuum=off disables cleanup vacuum and analyze, but
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* freeze vacuums can still happen, so we set
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* autovacuum_freeze_max_age high too.
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* autovacuum_freeze_max_age very high. We assume all datfrozenxid and
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* relfrozen values are less than a gap of 2000000000 from the current
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* xid counter, so autovacuum will not touch them.
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*/
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snprintf(cmd, sizeof(cmd),
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SYSTEMQUOTE "\"%s/pg_ctl\" -l \"%s\" -D \"%s\" "

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