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Code Activity

1. xact.c: update comments about changing MyProc->xid and MyProc->xmin.

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2. varsup.c:ReadNewTransactionId(): don't read nextXid from disk -
   this func doesn't allocate next xid, so ShmemVariableCache->nextXid
   may be used (but GetNewTransactionId() must be called first).
3. vacuum.c: change elog(ERROR, "Child item....") to elog(NOTICE) -
   this is not ERROR, proper handling is just not implemented, yet.
4. s_lock.c: increase S_MAX_BUSY by 2 times.
5. shmem.c:GetSnapshotData(): have to call ReadNewTransactionId()
   _after_ SpinAcquire(ShmemIndexLock).
This commit is contained in:
Vadim B. Mikheev
1999-06-06 20:19:35 +00:00
parent 48c1887964
commit 1b812d9358
5 changed files with 44 additions and 26 deletions
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25
src/backend/commands/vacuum.c
View File

@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.106 1999/06/03 13:25:54 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.107 1999/06/06 20:19:34 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1238,11 +1238,28 @@ vc_rpfheap(VRelStats *vacrelstats, Relation onerel,
Citemid = PageGetItemId(Cpage,
ItemPointerGetOffsetNumber(&Ctid));
if (!ItemIdIsUsed(Citemid))
elog(ERROR, "Child itemid marked as unused");
{
/*
* This means that in the middle of chain there was
* tuple updated by older (than XmaxRecent) xaction
* and this tuple is already deleted by me. Actually,
* upper part of chain should be removed and seems
* that this should be handled in vc_scanheap(), but
* it's not implemented at the moment and so we
* just stop shrinking here.
*/
ReleaseBuffer(Cbuf);
pfree(vtmove);
vtmove = NULL;
elog(NOTICE, "Child itemid in update-chain marked as unused - can't continue vc_rpfheap");
break;
}
tp.t_data = (HeapTupleHeader) PageGetItem(Cpage, Citemid);
tp.t_self = Ctid;
tlen = tp.t_len = ItemIdGetLength(Citemid);
}
if (vtmove == NULL)
break;
/* first, can chain be moved ? */
for (;;)
{
@@ -1336,6 +1353,7 @@ vc_rpfheap(VRelStats *vacrelstats, Relation onerel,
Ptp.t_data = (HeapTupleHeader) PageGetItem(Ppage, Pitemid);
Assert(Ptp.t_data->t_xmax == tp.t_data->t_xmin);
#ifdef NOT_USED /* I'm not sure that this will wotk properly... */
/*
* If this tuple is updated version of row and it
* was created by the same transaction then no one
@@ -1353,6 +1371,7 @@ vc_rpfheap(VRelStats *vacrelstats, Relation onerel,
WriteBuffer(Pbuf);
continue;
}
#endif
tp.t_data = Ptp.t_data;
tlen = tp.t_len = ItemIdGetLength(Pitemid);
if (freeCbuf)
@@ -1763,7 +1782,7 @@ Elapsed %u/%u sec.",
page = BufferGetPage(buf);
num_tuples = 0;
for (offnum = FirstOffsetNumber;
offnum < maxoff;
offnum <= maxoff;
offnum = OffsetNumberNext(offnum))
{
itemid = PageGetItemId(page, offnum);