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Replace implementation of pg_log as a relation accessed through the

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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.
This commit is contained in:
Tom Lane
2001-08-25 18:52:43 +00:00
parent 4699d81dc9
commit 2589735da0
39 changed files with 1248 additions and 1128 deletions
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23
src/backend/utils/init/postinit.c
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@ -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