22bd3cbe0c
Previously, in parallel vacuum, we allocated shmem area of IndexBulkDeleteResult only for indexes where parallel index vacuuming is safe and had null-bitmap in shmem area to access them. This logic was too complicated with a small benefit of saving only a few bits per indexes. In this commit, we allocate a dedicated shmem area for the array of LVParallelIndStats that includes a parallel-safety flag, the index vacuum status, and IndexBulkdeleteResult. There is one array element for every index, even those indexes where parallel index vacuuming is unsafe or not worthwhile. This commit makes the code clear by removing all bitmap-related code. Also, add the check each index vacuum status after parallel index vacuum to make sure that all indexes have been processed. Finally, rename parallel vacuum functions to parallel_vacuum_* for consistency. Author: Masahiko Sawada, based on suggestions by Andres Freund Reviewed-by: Hou Zhijie, Amit Kapila Discussion: https://www.postgresql.org/message-id/20211030212101.ae3qcouatwmy7tbr%40alap3.anarazel.de |
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README.git |
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/.