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Tom Lane 48188e1621 Fix recently-understood problems with handling of XID freezing, particularly ... in PITR scenarios. We now WAL-log the replacement of old XIDs with FrozenTransactionId, so that such replacement is guaranteed to propagate to PITR slave databases. Also, rather than relying on hint-bit updates to be preserved, pg_clog is not truncated until all instances of an XID are known to have been replaced by FrozenTransactionId. Add new GUC variables and pg_autovacuum columns to allow management of the freezing policy, so that users can trade off the size of pg_clog against the amount of freezing work done. Revise the already-existing code that forces autovacuum of tables approaching the wraparound point to make it more bulletproof; also, revise the autovacuum logic so that anti-wraparound vacuuming is done per-table rather than per-database. initdb forced because of changes in pg_class, pg_database, and pg_autovacuum catalogs. Heikki Linnakangas, Simon Riggs, and Tom Lane.		19 years ago
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autovacuum.h	Fix recently-understood problems with handling of XID freezing, particularly	19 years ago
bgwriter.h	Update copyright for 2006. Update scripts.	20 years ago
fork_process.h	Update copyright for 2006. Update scripts.	20 years ago
pgarch.h	Update copyright for 2006. Update scripts.	20 years ago
postmaster.h	Add a feature for automatic initialization and finalization of dynamically	20 years ago
syslogger.h	Clean up local redeclarations of variables with DLLIMPORT, per report	19 years ago