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Doc: Add references for SI and SSI.
Our documentation failed to point out that REPEATABLE READ is reallysnapshot isolation, which might be important to some users. Point tothe standard reference paper for this complicated topic.Likewise, add a reference to the VLDB paper about PostgreSQL SSI, fortechnical information about our SSI implementation and how it comparesto S2PL.While here, add a note about catalog access using a lower isolationlevel, per recent user complaint.Back-patch to all releases.Reported-by: Kyle Kingsbury <aphyr@jepsen.io>Reviewed-by: Andres Freund <andres@anarazel.de>Reviewed-by: Peter Geoghegan <pg@bowt.ie>Reviewed-by: Tatsuo Ishii <ishii@sraoss.co.jp>Discussion:https://postgr.es/m/db7b729d-0226-d162-a126-8a8ab2dc4443%40jepsen.ioDiscussion:https://postgr.es/m/16454-9408996bb1750faf%40postgresql.org1 parentdecbe2b commit1575fbf
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