Re: WIP: Fast GiST index build

On 03.08.2011 11:18, Alexander Korotkov wrote:
> I found that in previous version of patch I missed PageSetLSN
> and PageSetTLI, but huge amount of WAL is still here. Also I found that huge
> amount of WAL appears only with -O2. With -O0 amount of WAL is ok, but
> messages "FATAL: xlog flush request BFF11148/809A600 is not satisfied ---
> flushed only to 44/9C518750" appears. Seems that there is some totally wrong
> use of WAL if even optimization level does matter...

Try this:

diff --git a/src/backend/access/gist/gistbuild.c
b/src/backend/access/gist/gistbuild.c
index 5099330..5a441e0 100644
--- a/src/backend/access/gist/gistbuild.c
+++ b/src/backend/access/gist/gistbuild.c
@@ -478,7 +478,7 @@ bufferingbuildinsert(GISTInsertState *state,
/* Write the WAL record */
if (RelationNeedsWAL(state->r))
{
- gistXLogUpdate(state->r->rd_node, buffer, oldoffnum, noldoffnum,
+ recptr = gistXLogUpdate(state->r->rd_node, buffer, oldoffnum,
noldoffnum,
itup, ntup, InvalidBuffer);
PageSetLSN(page, recptr);
PageSetTLI(page, ThisTimeLineID);

--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com