upstream/postgresql
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2026-04-21 06:08:26 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions
Base de données relationnelle
19582 commits 38 branches 679 tags 843 MiB
C 84.5%
PLpgSQL 6.1%
Perl 4.9%
Yacc 1.2%
Meson 0.7%
Other 2.4%
Find a file
Neil Conway 3df9abd1a5 ALTER TABLE ADD COLUMN exhibits a significant memory leak when adding a 
column with a default expression. In that situation, we need to rewrite
the heap relation. To evaluate the new default expression, we use
ExecEvalExpr(); however, this can allocate memory in the current memory
context, and ATRewriteTable() does not switch out of the active portal's
heap memory context. The end result is a rather large memory leak (on
the order of gigabytes for a reasonably sized table).

This patch changes ATRewriteTable() to switch to the per-tuple memory
context before beginning the per-tuple loop. It also removes an explicit
heap_freetuple() in the loop, since that is no longer needed.

In an unrelated change, I noticed the code was scanning through the
attributes of the new tuple descriptor for each tuple of the old table.
I changed this to use precomputation, which should slightly speed up
the loop.

Thanks to steve@deefs.net for reporting the leak.
2005-02-09 23:17:26 +00:00
config New version of mkinstalldirs fixes problems on Tru64 UNIX. 2005-01-08 09:54:29 +00:00
contrib Make sure contrib C functions are marked strict where needed. 2005-01-29 22:35:02 +00:00
doc Spacing: 2005-02-08 03:23:51 +00:00
src ALTER TABLE ADD COLUMN exhibits a significant memory leak when adding a 2005-02-09 23:17:26 +00:00
aclocal.m4 Add new auto-detection of thread flags. 2004-04-23 18:15:55 +00:00
configure Stamp 8.1 in configure. 2005-01-18 05:23:36 +00:00
configure.in Stamp 8.1 in configure. 2005-01-18 05:23:36 +00:00
COPYRIGHT Tag appropriate files for rc3 2004-12-31 22:04:05 +00:00
GNUmakefile.in please find attached an alternate submission which addresses open item 2004-10-06 08:50:02 +00:00
Makefile please find attached an alternate submission which addresses open item 2004-10-06 08:50:02 +00:00
README Remove more traces of libpgtcl from the source tree. Also, make some 2004-10-01 02:00:44 +00:00
README.CVS Some further editorializing on README.CVS. 2004-03-28 06:09:08 +00:00

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.

The JDBC, ODBC, C++, Python, and Tcl interfaces have been moved to the
PostgreSQL Projects Web Site at http://gborg.postgresql.org for separate
maintenance.  A Perl DBI/DBD driver is available from CPAN.

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.  Changes between all PostgreSQL releases are recorded in the
file HISTORY.  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
ftp://ftp.postgresql.org/pub/.  For more information look at our web
site located at http://www.postgresql.org/.