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Tom Lane 3a675f729e Count heap tuples in non-SnapshotAny path in IndexBuildHeapRangeScan(). 
Brown-paper-bag bug in commit 7c91a0364: when we rearranged the placement
of "reltuples += 1" statements, we missed including one in this code path.

The net effect of that was that CREATE INDEX CONCURRENTLY would set the
table's pg_class.reltuples to zero, as would index builds done during
bootstrap mode.  (It seems like parallel index builds ought to fail
similarly, but they don't, perhaps because reltuples is computed in some
other way.  You certainly couldn't figure that out from the abysmally
underdocumented parallelism code in this area.)

I was led to this by wondering why initdb seemed to have slowed down as
a result of 7c91a0364, as is evident in the buildfarm's timing history.
The reason is that every system catalog with indexes had pg_class.reltuples
= 0 after bootstrap, causing the planner to make some terrible choices for
queries in the post-bootstrap steps.  On my workstation, this fix causes
the runtime of "initdb -N" to drop from ~2.0 sec to ~1.4 sec, which is
almost though not quite back to where it was in v10.  That's not much of
a deal for production use perhaps, but it makes a noticeable difference
for buildfarm and "make check-world" runs, which do a lot of initdbs.
2018-05-08 00:20:19 -04:00
config Use ARMv8 CRC instructions where available. 2018-04-04 12:22:45 +03:00
contrib adminpack: Revoke EXECUTE on pg_logfile_rotate() 2018-05-07 10:10:33 -04:00
doc Last-minute updates for release notes. 2018-05-07 13:13:27 -04:00
src Count heap tuples in non-SnapshotAny path in IndexBuildHeapRangeScan(). 2018-05-08 00:20:19 -04:00
.dir-locals.el Make Emacs settings match perltidy configuration 2018-04-23 11:44:31 -04:00
.gitattributes Remove contrib/tsearch2. 2017-02-13 11:06:11 -05:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
aclocal.m4 Add configure infrastructure (--with-llvm) to enable LLVM support. 2018-03-20 17:26:25 -07:00
configure Improve our method for probing the availability of ARM CRC instructions. 2018-05-02 18:06:43 -04:00
configure.in Improve our method for probing the availability of ARM CRC instructions. 2018-05-02 18:06:43 -04:00
COPYRIGHT Update copyright for 2018 2018-01-02 23:30:12 -05:00
GNUmakefile.in Have "make coverage" recurse into contrib as well 2016-09-05 18:44:36 -03:00
HISTORY Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
Makefile Fix non-GNU makefiles for AIX make. 2017-11-30 00:57:22 -08:00
README Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
README.git Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00

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/.