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Tom Lane 60b2444cc3 Add code to prevent transaction ID wraparound by enforcing a safe limit ... in GetNewTransactionId(). Since the limit value has to be computed before we run any real transactions, this requires adding code to database startup to scan pg_database and determine the oldest datfrozenxid. This can conveniently be combined with the first stage of an attack on the problem that the 'flat file' copies of pg_shadow and pg_group are not properly updated during WAL recovery. The code I've added to startup resides in a new file src/backend/utils/init/flatfiles.c, and it is responsible for rewriting the flat files as well as initializing the XID wraparound limit value. This will eventually allow us to get rid of GetRawDatabaseInfo too, but we'll need an initdb so we can add a trigger to pg_database.		21 years ago
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common	Change heap_modifytuple() to require a TupleDesc rather than a	21 years ago
gist	Marginal hack to merge adjacent ReleaseBuffer/ReadBuffer calls into	21 years ago
hash	Tag appropriate files for rc3	21 years ago
heap	Update copyrights that were missed.	21 years ago
index	Tag appropriate files for rc3	21 years ago
nbtree	Tag appropriate files for rc3	21 years ago
rtree	Fix memory leak in rtdosplit, per report from Clive Page.	21 years ago
transam	Add code to prevent transaction ID wraparound by enforcing a safe limit	21 years ago
Makefile	$Header: -> $PostgreSQL Changes ...	22 years ago