database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-06 07:49:08 +03:00
Code Activity

Replace implementation of pg_log as a relation accessed through the

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

10
src/backend/utils/time/tqual.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/time/tqual.c,v 1.40 2001/08/23 23:06:38 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/time/tqual.c,v 1.41 2001/08/25 18:52:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -611,12 +611,12 @@ HeapTupleSatisfiesVacuum(HeapTupleHeader tuple, TransactionId XmaxRecent)
* If the inserting transaction aborted, then the tuple was never visible
* to any other transaction, so we can delete it immediately.
*
* NOTE: must check TransactionIdIsInProgress (which looks in shared mem)
* NOTE: must check TransactionIdIsInProgress (which looks in PROC array)
* before TransactionIdDidCommit/TransactionIdDidAbort (which look in
* pg_log). Otherwise we have a race condition where we might decide
* pg_clog). Otherwise we have a race condition where we might decide
* that a just-committed transaction crashed, because none of the tests
* succeed. xact.c is careful to record commit/abort in pg_log before
* it unsets MyProc->xid in shared memory.
* succeed. xact.c is careful to record commit/abort in pg_clog before
* it unsets MyProc->xid in PROC array.
*/
if (!(tuple->t_infomask & HEAP_XMIN_COMMITTED))
{