
e2e992820f104def introduced a test which generated dead tuples for vacuum with an UPDATE. The test only required enough dead TIDs for two rounds of index vacuuming. This can be accomplished with a DELETE instead of an UPDATE -- which generates about 50% less WAL and makes the test 20% faster in many cases. The test takes several seconds (more on slow buildfarm animals) because we need quite a few tuples to trigger two rounds of index vacuuming; so it is worth a follow-on commit to speed it up. Suggested-by: Masahiko Sawada Discussion: https://postgr.es/m/CAAKRu_bWmMjmqL%2BOZ2duEQ80u7cRvpsExLNZNjzk-pXX5skwMQ%40mail.gmail.com Backpatch-through: 14, the first version containing this test.
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/.
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