On 10th of February, Magnus Hagander committed patch:
Track last time for statistics reset on databases and bgwriter Tracks one counter for each database, which is reset whenever the statistics for any individual object inside the database is reset, and one counter for the background writer. Tomas Vondra, reviewed by Greg Smith
On 8th of February, Tom Lane committed patch:
Core support for "extensions", which are packages of SQL objects. This patch adds the server infrastructure to support extensions. There is still one significant loose end, namely how to make it play nice with pg_upgrade, so I am not yet committing the changes that would make all the contrib modules depend on this feature. In passing, fix a disturbingly large amount of breakage in AlterObjectNamespace() and callers. Dimitri Fontaine, reviewed by Anssi Kääriäinen, Itagaki Takahiro, Tom Lane, and numerous others
On 8th of February, Simon Riggs committed patch:
Extend ALTER TABLE TO allow FOREIGN KEYS TO be added WITHOUT initial validation. FK constraints that are marked NOT VALID may later be VALIDATED, which uses an ShareUpdateExclusiveLock ON CONSTRAINT TABLE AND RowShareLock ON referenced TABLE. Significantly reduces LOCK strength AND duration WHEN adding FKs. NEW state visible FROM psql. Simon Riggs, WITH reviews FROM Marko Tiikkaja AND Robert Haas
On 1st of February, Tom Lane committed patch:
Support LIKE and ILIKE index searches via contrib/pg_trgm indexes. Unlike Btree-based LIKE optimization, this works for non-left-anchored search patterns. The effectiveness of the search depends on how many trigrams can be extracted from the pattern. (The worst case, with no trigrams, degrades to a full-table scan, so this isn't a panacea. But it can be very useful.) Alexander Korotkov, reviewed by Jan Urbanski
On 25th of January, Tom Lane committed patch:
Implement ALTER TABLE ADD UNIQUE/PRIMARY KEY USING INDEX. This feature allows a UNIQUE OR pkey CONSTRAINT TO be created USING an already-existing UNIQUE INDEX. While the CONSTRAINT isn't very functionally different from the bare index, it's nice TO be able TO do that FOR documentation purposes. The main advantage OVER just issuing a plain ALTER TABLE ADD UNIQUE/PRIMARY KEY IS that the INDEX can be created WITH CREATE INDEX CONCURRENTLY, so that there IS NOT a long INTERVAL WHERE the TABLE IS locked against updates. ON the way, refactor SOME OF the code IN DefineIndex() AND index_create() so that we don't have to pass through those functions in order to create the index constraint's catalog entries. Also, IN parse_utilcmd.c, pass around the ParseState pointer IN struct CreateStmtContext TO save ON notation, AND ADD error location pointers TO SOME error reports that didn't have one before. Gurjeet Singh, reviewed by Steve Singer and Tom Lane
Continue reading Waiting for 9.1 – Add UNIQUE/PRIMARY KEY with index
On 24th of January, Robert Haas committed very important patch:
sepgsql, an SE-Linux integration for PostgreSQL This is still pretty rough - among other things, the documentation needs work, and the messages need a visit from the style police - but this gets the basic framework in place. KaiGai Kohei
Now, In this place I usually show you what it is all about, but it's not going to happen with this patch. Reason is very simple – I know that it's important, and that it integrates PostgreSQL with SE/Linux, but since I never played with SE/Linux – I cannot really show you anything in here.
But – if you know anything about SE/Linux and sepgsql, I would like to ask you to describe this extension so that even I could understand it.
Sorry – I know I should put more in here, but it simply is so far above my knowledge limits, it would take me too long time to get through documentation for SE/Linux and sepgsql.
For now – if you want to know more – simply check the docs.
On 23rd of January, Magnus Hagander committed patch which adds:
Add pg_basebackup tool for streaming base backups This tool makes it possible to do the pg_start_backup/ copy files/pg_stop_backup step in a single command. There are still some steps to be done before this is a complete backup solution, such as the ability to stream the required WAL logs, but it's still usable, and could do with some buildfarm coverage. In passing, make the checkpoint request optionally fast instead of hardcoding it. Magnus Hagander, reviewed by Fujii Masao and Dimitri Fontaine
On 7th of January (I know, it was quite some time ago, I apologize for delay) Itagaki Takahiro committed patch:
New system view pg_stat_replication displays activity of wal sender processes. Itagaki Takahiro and Simon Riggs.
On 29th of December, Robert Haas committed interesting patch, which does:
Support unlogged tables. The contents of an unlogged table aren't WAL-logged; thus, they are not available on standby servers and are truncated whenever the database system enters recovery. Indexes on unlogged tables are also unlogged. Unlogged GiST indexes are not currently supported.
(edited commit message, due to this mail.
On 4th of December, Tom Lane committed really cool patch:
KNNGIST, otherwise known as order-by-operator support for GIST.
This commit represents a rather heavily editorialized version of Teodor's builtin_knngist_itself-0.8.2 and builtin_knngist_proc-0.8.1 patches. I redid the opclass API to add a separate Distance method instead of turning the Consistent method into an illogical mess, fixed some bit-rot in the rbtree interfaces, and generally worked over the code style and comments. There's still no non-code documentation to speak of, but I'll work on that separately. Some contrib-module changes are also yet to come (right now, point <-> point is the only KNN-ified operator). Teodor Sigaev and Tom Lane