dd69597988
The new nleft_dead_tuples and nleft_dead_itemids fields are confusing and do not seem like the correct way forward. One of them is tested via an assertion that can fail, as it has already done on buildfarm member topminnow. Remove the assertion and the fields. Change the logic for the case where a tuple is not initially pruned by heap_page_prune but later diagnosed HEAPTUPLE_DEAD by HeapTupleSatisfiesVacuum. Previously, tupgone = true was set in that case, which leads to treating the tuple as one that will be removed. In a normal vacuum, that's OK, because we'll remove index entries for it and then the second heap pass will remove the tuple itself, but when index cleanup is disabled, those things don't happen, so we must instead treat it as a recently-dead tuple that we have voluntarily chosen to keep. Report and analysis by Tom Lane. This patch loosely based on one from Masahiko Sawada, but I changed most of it. |
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README
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/.