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From: Justin Pryzby <pryzby@telsasoft.com>
To: David Rowley <dgrowleyml@gmail.com>
Cc: Melanie Plageman <melanieplageman@gmail.com>
Cc: Andres Freund <andres@anarazel.de>
Cc: Masahiko Sawada <sawada.mshk@gmail.com>
Cc: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Peter Geoghegan <pg@bowt.ie>
Cc: pgsql-hackers@postgresql.org, Robert Haas <robertmhaas@gmail.com>
Subject: Re: Option to not use ringbuffer in VACUUM, using it in failsafe mode
Date: Thu, 6 Apr 2023 16:16:47 -0500
Message-ID: <ZC82v3KVbruPgDtS@telsasoft.com> (raw)
In-Reply-To: <CAApHDvrDsCeyVxkkrfe5H4gsw4sBDSPL8cK2fAdhMEn+pY96Rw@mail.gmail.com>
References: <CAAKRu_byrV-W3NcROimLrz_vX-ZvKTv9yxvoWgfjOeQUsJ5kpA@mail.gmail.com>
	<20230405170553.webeqbzhmnawgnvg@awork3.anarazel.de>
	<CAAKRu_ZevZBtvqM1Eh3Wr587wf2vCW=XxOkaUn=s12apE5ekZg@mail.gmail.com>
	<20230405211534.4skgskbilnxqrmxg@awork3.anarazel.de>
	<CAAKRu_bJRKe+v_=OqwC+5sA3j5qv8rqdAwy3+yHaO3wmtfrCRg@mail.gmail.com>
	<CAAKRu_byOPANPzNiu=d2ACvfzWfNURPYPwo2v7iWddHLFLMcJA@mail.gmail.com>
	<CAApHDvo57+sYWx+nwM3DXM2m0S8f1XDruTURSWjdwOSRKu6s9Q@mail.gmail.com>
	<CAAKRu_bwE+kov=1Y35-dxF4jandvFWA1NiSyCG_=kUFs9xvw-Q@mail.gmail.com>
	<CAAKRu_YdzP42WTZPQO0QePosxFqjHavC1v87BMaaiXqD9b12wA@mail.gmail.com>
	<CAApHDvrDsCeyVxkkrfe5H4gsw4sBDSPL8cK2fAdhMEn+pY96Rw@mail.gmail.com>

+VACUUM uses a ring like sequential scans, however, the size this ring
+controlled by the vacuum_buffer_usage_limit GUC.  Dirty pages are not removed

should say: ".. the size OF this ring IS .." ?





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