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Replace implementation of pg_log as a relation accessed through the
buffer manager with 'pg_clog', a specialized access method modeled on pg_xlog. This simplifies startup (don't need to play games to open pg_log; among other things, OverrideTransactionSystem goes away), should improve performance a little, and opens the door to recycling commit log space by removing no-longer-needed segments of the commit log. Actual recycling is not there yet, but I felt I should commit this part separately since it'd still be useful if we chose not to do transaction ID wraparound.
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‎doc/src/sgml/backup.sgml

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<!-- $Header: /cvsroot/pgsql/doc/src/sgml/backup.sgml,v 2.11 2001/08/16 04:30:41 ishii Exp $ -->
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<!-- $Header: /cvsroot/pgsql/doc/src/sgml/backup.sgml,v 2.12 2001/08/25 18:52:41 tgl Exp $ -->
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<chapter id="backup">
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<title>Backup and Restore</title>
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@@ -339,11 +339,11 @@ tar -cf backup.tar /usr/local/pgsql/data
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individual tables or databases from their respective files or
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directories. This will <emphasis>not</> work because the
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information contained in these files contains only half the
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truth. The other half is in the file
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<filename>pg_log</filename>, which contains the commit status of
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truth. The other half is in the commit log files
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<filename>pg_clog/*</filename>, which contain the commit status of
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all transactions. A table file is only usable with this
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information. Of course it is also impossible to restore only a
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table and the associated <filename>pg_log</filename> file
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table and the associated <filename>pg_clog</filename> data
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because that will render all other tables in the database
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cluster useless.
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</para>

‎doc/src/sgml/wal.sgml

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<!-- $Header: /cvsroot/pgsql/doc/src/sgml/wal.sgml,v 1.7 2001/05/17 21:50:16 petere Exp $ -->
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<!-- $Header: /cvsroot/pgsql/doc/src/sgml/wal.sgml,v 1.8 2001/08/25 18:52:41 tgl Exp $ -->
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<chapter id="wal">
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<title>Write-Ahead Logging (<acronym>WAL</acronym>)</title>
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In this first release of <acronym>WAL</acronym>, UNDO operation is
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not implemented, because of lack of time. This means that changes
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made by aborted transactions will still occupy disk space and that
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we still need a permanent <filename>pg_log</filename> file to hold
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we still need a permanent <filename>pg_clog</filename> file to hold
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the status of transactions, since we are not able to re-use
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transaction identifiers. Once UNDO is implemented,
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<filename>pg_log</filename> will no longer be required to be
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<filename>pg_clog</filename> will no longer be required to be
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permanent; it will be possible to remove
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<filename>pg_log</filename> at shutdown, split it into segments
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<filename>pg_clog</filename> at shutdown, split it into segments
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and remove old segments.
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</para>
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‎src/backend/access/transam/Makefile

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# Makefile for access/transam
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#
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# IDENTIFICATION
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# $Header: /cvsroot/pgsql/src/backend/access/transam/Makefile,v 1.14 2001/08/24 14:07:48 petere Exp $
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# $Header: /cvsroot/pgsql/src/backend/access/transam/Makefile,v 1.15 2001/08/25 18:52:41 tgl Exp $
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#
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#-------------------------------------------------------------------------
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subdir = src/backend/access/transam
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top_builddir = ../../../..
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include $(top_builddir)/src/Makefile.global
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OBJS = transam.o transsup.o varsup.o xact.o xid.o xlog.o xlogutils.o rmgr.o
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OBJS = clog.o transam.o varsup.o xact.o xid.o xlog.o xlogutils.o rmgr.o
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all: SUBSYS.o
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