mirror of https://github.com/postgres/postgres
9ecb134a93
This commit reworks pg_get_wal_fpi_info() to become aware of all the block information that can be attached to a record rather than just its full-page writes: - Addition of the block id as assigned by XLogRegisterBuffer(), XLogRegisterBlock() or XLogRegisterBufData(). - Addition of the block data, as bytea, or NULL if none. The length of the block data can be guessed with length(), so there is no need to store its length in a separate field. - Addition of the full-page image length, as counted without a hole or even compressed. - Modification of the handling of the full-page image data. This is still a bytea, but it could become NULL if none is assigned to a block. - Addition of the full-page image flags, tracking if a page is stored with a hole, if it needs to be applied and the type of compression applied to it, as of all the BKPIMAGE_* values in xlogrecord.h. The information of each block is returned as one single record, with the record's ReadRecPtr included to be able to join the block information with the existing pg_get_wal_records_info(). Note that it is perfectly possible for a block to hold both data and full-page image. Thanks also to Kyotaro Horiguchi and Matthias van de Meent for the discussion. This commit uses some of the work proposed by Melanie, though it has been largely redesigned and rewritten by me. Bharath has helped in refining a bit the whole. Reported-by: Melanie Plageman Author: Michael Paquier, Melanie Plageman, Bharath Rupireddy Discussion: https://postgr.es/m/CAAKRu_bORebdZmcV8V4cZBzU8M_C6tDDdbiPhCZ6i-iuSXW9TA@mail.gmail.com |
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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/.