Tom Lane 511e902b51 Make TRUNCATE ... RESTART IDENTITY restart sequences transactionally. ... In the previous coding, we simply issued ALTER SEQUENCE RESTART commands, which do not roll back on error. This meant that an error between truncating and committing left the sequences out of sync with the table contents, with potentially bad consequences as were noted in a Warning on the TRUNCATE man page. To fix, create a new storage file (relfilenode) for a sequence that is to be reset due to RESTART IDENTITY. If the transaction aborts, we'll automatically revert to the old storage file. This acts just like a rewriting ALTER TABLE operation. A penalty is that we have to take exclusive lock on the sequence, but since we've already got exclusive lock on its owning table, that seems unlikely to be much of a problem. The interaction of this with usual nontransactional behaviors of sequence operations is a bit weird, but it's hard to see what would be completely consistent. Our choice is to discard cached-but-unissued sequence values both when the RESTART is executed, and at rollback if any; but to not touch the currval() state either time. In passing, move the sequence reset operations to happen before not after any AFTER TRUNCATE triggers are fired. The previous ordering was not logically sensible, but was forced by the need to minimize inconsistency if the triggers caused an error. Transactional rollback is a much better solution to that. Patch by Steve Singer, rather heavily adjusted by me.		2010-11-17 16:42:18 -05:00
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access	The GiST scan algorithm uses LSNs to detect concurrent pages splits, but	2010-11-16 11:32:21 +02:00
bootstrap	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
catalog	Add new buffers_backend_fsync field to pg_stat_bgwriter.	2010-11-15 12:42:59 -05:00
commands	Make TRUNCATE ... RESTART IDENTITY restart sequences transactionally.	2010-11-17 16:42:18 -05:00
executor	Support MergeAppend plans, to allow sorted output from append relations.	2010-10-14 16:57:57 -04:00
foreign	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
lib	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
libpq	Add a client authentication hook.	2010-10-26 21:20:38 -04:00
mb	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
nodes	Reimplement planner's handling of MIN/MAX aggregate optimization.	2010-11-04 12:01:17 -04:00
optimizer	Use appendrel planning logic for top-level UNION ALL structures.	2010-11-08 15:15:02 -05:00
parser	Provide hashing support for arrays.	2010-10-30 21:56:11 -04:00
port	Don't use __declspec (dllimport) for PGDLLEXPORT to reduce warnings	2010-11-10 12:17:43 +09:00
portability	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
postmaster	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
regex	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
replication	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
rewrite	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
snowball	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
storage	Fix copy-and-pasteo a little more completely.	2010-11-15 10:10:58 -05:00
tcop	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
tsearch	Reduce the memory requirement for large ispell dictionaries.	2010-10-06 19:31:05 -04:00
utils	Provide hashing support for arrays.	2010-10-30 21:56:11 -04:00
.gitignore	Convert cvsignore to gitignore, and add .gitignore for build targets.	2010-09-22 12:57:04 +02:00
c.h	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
fmgr.h	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
funcapi.h	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
getaddrinfo.h	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
getopt_long.h	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
Makefile	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
miscadmin.h	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
pg_config.h.in	Replace self written 'long long int' configure test by standard 'AC_TYPE_LONG_LONG_INT' macro call.	2010-05-25 17:28:20 +00:00
pg_config.h.win32	Stamp HEAD as 9.1devel.	2010-07-09 04:10:58 +00:00
pg_config_manual.h	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
pg_trace.h	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
pgstat.h	Add new buffers_backend_fsync field to pg_stat_bgwriter.	2010-11-15 12:42:59 -05:00
pgtime.h	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
port.h	Move copydir() prototype into its own header file.	2010-11-12 16:39:53 -05:00
postgres.h	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
postgres_ext.h	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
postgres_fe.h	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
rusagestub.h	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
windowapi.h	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00