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Our documentation failed to point out that REPEATABLE READ is really snapshot isolation, which might be important to some users. Point to the standard reference paper for this complicated topic. Likewise, add a reference to the VLDB paper about PostgreSQL SSI, for technical information about our SSI implementation and how it compares to S2PL. While here, add a note about catalog access using a lower isolation level, 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.io Discussion: https://postgr.es/m/16454-9408996bb1750faf%40postgresql.org
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.