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.

2 files changed, 7 insertions, 19 deletions

diff --git a/src/backend/utils/init/globals.c b/src/backend/utils/init/globals.c
index 7dff67bffbc..935340ea01d 100644
--- a/src/backend/utils/init/globals.c
+++ b/src/backend/utils/init/globals.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/init/globals.c,v 1.58 2001/06/12 05:55:50 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/init/globals.c,v 1.59 2001/08/25 18:52:42 tgl Exp $
  *
  * NOTES
  *	  Globals used all over the place should be declared here and not
@@ -102,7 +102,6 @@ char	   *SharedSystemRelationNames[] = {
 	GroupRelationName,
 	GroupNameIndex,
 	GroupSysidIndex,
-	LogRelationName,
 	ShadowRelationName,
 	ShadowNameIndex,
 	ShadowSysidIndex,
diff --git a/src/backend/utils/init/postinit.c b/src/backend/utils/init/postinit.c
index dedd9a8e765..51bd00bec30 100644
--- a/src/backend/utils/init/postinit.c
+++ b/src/backend/utils/init/postinit.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/init/postinit.c,v 1.87 2001/06/16 22:58:16 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/init/postinit.c,v 1.88 2001/08/25 18:52:42 tgl Exp $
  *
  *
  *-------------------------------------------------------------------------
@@ -285,26 +285,15 @@ InitPostgres(const char *dbname, const char *username)
 		elog(FATAL, "InitPostgres: bad backend id %d", MyBackendId);
 
 	/*
-	 * Initialize the transaction system and the relation descriptor
-	 * cache. Note we have to make certain the lock manager is off while
-	 * we do this.
+	 * Initialize the transaction system override state.
 	 */
-	AmiTransactionOverride(IsBootstrapProcessingMode());
-	LockDisable(true);
+	AmiTransactionOverride(bootstrap);
 
 	/*
-	 * Part of the initialization processing done here sets a read lock on
-	 * pg_log.	Since locking is disabled the set doesn't have intended
-	 * effect of locking out writers, but this is ok, since we only lock
-	 * it to examine AMI transaction status, and this is never written
-	 * after initdb is done. -mer 15 June 1992
+	 * Initialize the relation descriptor cache.
+	 * The pre-allocated reldescs are created here.
 	 */
-	RelationCacheInitialize();	/* pre-allocated reldescs created here */
-
-	InitializeTransactionSystem();		/* pg_log,etc init/crash recovery
-										 * here */
-
-	LockDisable(false);
+	RelationCacheInitialize();
 
 	/*
 	 * Initialize the access methods. Does not touch files (?) - thomas