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Tom Lane 25ec228ef7 Track the current XID wrap limit (or more accurately, the oldest unfrozen ... XID) in checkpoint records. This eliminates the need to recompute the value from scratch during database startup, which is one of the two remaining reasons for the flatfile code to exist. It should also simplify life for hot-standby operation. To avoid bloating the checkpoint records unreasonably, I switched from tracking the oldest database by name to tracking it by OID. This turns out to save cycles in general (everywhere but the warning-generating paths, which we hardly care about) and also helps us deal with the case that the oldest database got dropped instead of being vacuumed. The prior coding might go for a long time without updating the wrap limit in that case, which is bad because it might result in a lot of useless autovacuum activity.		16 years ago
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access	Track the current XID wrap limit (or more accurately, the oldest unfrozen	16 years ago
bootstrap	Derived files that are shipped in the distribution used to be built in the	16 years ago
catalog	Update of install-sh, mkinstalldirs, and associated configury	16 years ago
commands	Track the current XID wrap limit (or more accurately, the oldest unfrozen	16 years ago
executor	Tweak ExecIndexEvalRuntimeKeys to forcibly detoast any toasted comparison	16 years ago
foreign	Somebody seems to have thought they could get away without checking for	16 years ago
lib	Assorted minor refactoring in EXPLAIN.	16 years ago
libpq	Remove the use of the pg_auth flat file for client authentication.	16 years ago
main	Update copyright for 2009.	17 years ago
nodes	Merge the Constraint and FkConstraint node types into a single type.	16 years ago
optimizer	Put back adjust_appendrel_attrs()'s code for dealing with RestrictInfo.	16 years ago
parser	Derived files that are shipped in the distribution used to be built in the	16 years ago
po	Translation updates for 8.4 release.	16 years ago
port	Reserve the shared memory region during backend startup on Windows, so	16 years ago
postmaster	Remove the use of the pg_auth flat file for client authentication.	16 years ago
regex	8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list	16 years ago
rewrite	8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list	16 years ago
snowball	Derived files that are shipped in the distribution used to be built in the	16 years ago
storage	Allow backends to start up without use of the flat-file copy of pg_database.	16 years ago
tcop	Remove the use of the pg_auth flat file for client authentication.	16 years ago
tsearch	Remove duplicate variable initializations identified by clang static checker.	16 years ago
utils	Track the current XID wrap limit (or more accurately, the oldest unfrozen	16 years ago
Makefile	Derived files that are shipped in the distribution used to be built in the	16 years ago
common.mk	Expand test coverage support to entire tree	16 years ago
nls.mk	Convert the core lexer and parser into fully reentrant code, by making use	16 years ago