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Tom Lane 295e63983d Implement lazy XID allocation: transactions that do not modify any database 
rows will normally never obtain an XID at all.  We already did things this way
for subtransactions, but this patch extends the concept to top-level
transactions.  In applications where there are lots of short read-only
transactions, this should improve performance noticeably; not so much from
removal of the actual XID-assignments, as from reduction of overhead that's
driven by the rate of XID consumption.  We add a concept of a "virtual
transaction ID" so that active transactions can be uniquely identified even
if they don't have a regular XID.  This is a much lighter-weight concept:
uniqueness of VXIDs is only guaranteed over the short term, and no on-disk
record is made about them.

Florian Pflug, with some editorialization by Tom.
2007-09-05 18:10:48 +00:00
..
access Implement lazy XID allocation: transactions that do not modify any database 2007-09-05 18:10:48 +00:00
bootstrap Create a new dedicated Postgres process, "wal writer", which exists to write 2007-07-24 04:54:09 +00:00
catalog Implement lazy XID allocation: transactions that do not modify any database 2007-09-05 18:10:48 +00:00
commands Simplify the syntax of CREATE/ALTER TEXT SEARCH DICTIONARY by treating the 2007-08-22 01:39:46 +00:00
executor Arrange to cache a ResultRelInfo in the executor's EState for relations that 2007-08-15 21:39:50 +00:00
lib Add resetStringInfo(), which clears the content of a StringInfo, and 2007-03-03 19:32:55 +00:00
libpq Move session_start out of MyProcPort stucture and make it a global called MyStartTime, 2007-08-02 23:39:45 +00:00
mb Make JOHAB client only encoding per discussions in pgsql-hackers 2007-04-15 10:56:30 +00:00
nodes Support SET FROM CURRENT in CREATE/ALTER FUNCTION, ALTER DATABASE, ALTER ROLE. 2007-09-03 18:46:30 +00:00
optimizer Rename DLLIMPORT macro to PGDLLIMPORT to avoid conflict with 2007-07-25 12:22:54 +00:00
parser Separate parse-analysis for utility commands out of parser/analyze.c 2007-06-23 22:12:52 +00:00
port Rename DLLIMPORT macro to PGDLLIMPORT to avoid conflict with 2007-07-25 12:22:54 +00:00
postmaster Provide for logfiles in machine readable CSV format. In consequence, rename 2007-08-19 01:41:25 +00:00
regex Wording cleanup for error messages. Also change can't -> cannot. 2007-02-01 19:10:30 +00:00
rewrite Fix a couple of misbehaviors rooted in the fact that the default creation 2007-08-27 03:36:08 +00:00
snowball Tsearch2 functionality migrates to core. The bulk of this work is by 2007-08-21 01:11:32 +00:00
storage Implement lazy XID allocation: transactions that do not modify any database 2007-09-05 18:10:48 +00:00
tcop Rename DLLIMPORT macro to PGDLLIMPORT to avoid conflict with 2007-07-25 12:22:54 +00:00
tsearch Cleanup for some problems in tsearch patch: 2007-08-25 00:03:59 +00:00
utils Provide for binary input/output of enums, to fix complaint from Merlin Moncure. 2007-09-04 16:41:43 +00:00
c.h Implement lazy XID allocation: transactions that do not modify any database 2007-09-05 18:10:48 +00:00
fmgr.h Rename DLLIMPORT macro to PGDLLIMPORT to avoid conflict with 2007-07-25 12:22:54 +00:00
funcapi.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
getaddrinfo.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
getopt_long.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
Makefile Allow installation into directories containing spaces in the name. 2005-12-09 21:19:36 +00:00
miscadmin.h Move session_start out of MyProcPort stucture and make it a global called MyStartTime, 2007-08-02 23:39:45 +00:00
pg_config.h.in Support GSSAPI builds where the header is <gssapi.h> and not <gssapi/gssapi.h>, 2007-07-12 14:36:52 +00:00
pg_config.h.win32 Enable IPV6 for all MSVC builds, including the VC6 libpq-only build. 2007-04-16 18:39:19 +00:00
pg_config_manual.h Arrange for large sequential scans to synchronize with each other, so that 2007-06-08 18:23:53 +00:00
pg_trace.h pgindent run for 8.2. 2006-10-04 00:30:14 +00:00
pgstat.h Remove the pgstat_drop_relation() call from smgr_internal_unlink(), because 2007-07-08 22:23:16 +00:00
pgtime.h Fix crash caused by log_timezone patch if we attempt to emit any elog messages 2007-08-04 19:29:25 +00:00
port.h Get dirmod.c on the same page as port.h about whether we use pgsymlink 2007-07-12 23:28:49 +00:00
postgres.h Rename DLLIMPORT macro to PGDLLIMPORT to avoid conflict with 2007-07-25 12:22:54 +00:00
postgres_ext.h Move NAMEDATALEN definition from postgres_ext.h to pg_config_manual.h. It 2007-02-06 09:16:08 +00:00
postgres_fe.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
rusagestub.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00