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Robert Haas 174c480508 Add a new WAL summarizer process. ... When active, this process writes WAL summary files to $PGDATA/pg_wal/summaries. Each summary file contains information for a certain range of LSNs on a certain TLI. For each relation, it stores a "limit block" which is 0 if a relation is created or destroyed within a certain range of WAL records, or otherwise the shortest length to which the relation was truncated during that range of WAL records, or otherwise InvalidBlockNumber. In addition, it stores a list of blocks which have been modified during that range of WAL records, but excluding blocks which were removed by truncation after they were modified and never subsequently modified again. In other words, it tells us which blocks need to copied in case of an incremental backup covering that range of WAL records. But this doesn't yet add the capability to actually perform an incremental backup; the next patch will do that. A new parameter summarize_wal enables or disables this new background process. The background process also automatically deletes summary files that are older than wal_summarize_keep_time, if that parameter has a non-zero value and the summarizer is configured to run. Patch by me, with some design help from Dilip Kumar and Andres Freund. Reviewed by Matthias van de Meent, Dilip Kumar, Jakub Wartak, Peter Eisentraut, and Álvaro Herrera. Discussion: http://postgr.es/m/CA+TgmoYOYZfMCyOXFyC-P+-mdrZqm5pP2N7S-r0z3_402h9rsA@mail.gmail.com		2 years ago
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activity	Add a new WAL summarizer process.	2 years ago
adt	Micro-optimize datum_to_json_internal() some more.	2 years ago
cache	Remove trace_recovery_messages	2 years ago
error	Remove trace_recovery_messages	2 years ago
fmgr	Cache opaque handle for GUC option to avoid repeasted lookups.	2 years ago
hash	Update copyright for 2023	3 years ago
init	Add a new WAL summarizer process.	2 years ago
mb	Teach convert() and friends to avoid copying when possible.	2 years ago
misc	Add a new WAL summarizer process.	2 years ago
mmgr	Simplify newNode() by removing special cases	2 years ago
resowner	Fix bug in the new ResourceOwner implementation.	2 years ago
sort	Allow parallel CREATE INDEX for BRIN indexes	2 years ago
time	Make ResourceOwners more easily extensible.	2 years ago
.gitignore	Rearrange makefile rules for running Gen_fmgrtab.pl.	8 years ago
Gen_dummy_probes.pl	Replace Gen_dummy_probes.sed with Gen_dummy_probes.pl	2 years ago
Gen_fmgrtab.pl	Pre-beta mechanical code beautification.	3 years ago
Makefile	Replace Gen_dummy_probes.sed with Gen_dummy_probes.pl	2 years ago
errcodes.txt	Remove the "snapshot too old" feature.	2 years ago
generate-errcodes.pl	Pre-beta mechanical code beautification.	3 years ago
meson.build	Update copyright for 2023	3 years ago
postprocess_dtrace.sed	Update copyright for 2023	3 years ago
probes.d	bufmgr: Introduce infrastructure for faster relation extension	3 years ago