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Buffering GiST index build algorithm.

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When building a GiST index that doesn't fit in cache, buffers are attached
to some internal nodes in the index. This speeds up the build by avoiding
random I/O that would otherwise be needed to traverse all the way down the
tree to the find right leaf page for tuple.

Alexander Korotkov
This commit is contained in:
Heikki Linnakangas
2011-09-08 17:51:23 +03:00
parent 09b68c70af
commit 5edb24a898
11 changed files with 2297 additions and 186 deletions
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6
src/backend/access/gist/gistxlog.c
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@ -263,7 +263,8 @@ gistRedoPageSplitRecord(XLogRecPtr lsn, XLogRecord *record)
else
GistPageGetOpaque(page)->rightlink = xldata->origrlink;
GistPageGetOpaque(page)->nsn = xldata->orignsn;
if (i < xlrec.data->npage - 1 && !isrootsplit)
if (i < xlrec.data->npage - 1 && !isrootsplit &&
xldata->markfollowright)
GistMarkFollowRight(page);
else
GistClearFollowRight(page);
@ -411,7 +412,7 @@ XLogRecPtr
gistXLogSplit(RelFileNode node, BlockNumber blkno, bool page_is_leaf,
SplitedPageLayout *dist,
BlockNumber origrlink, GistNSN orignsn,
Buffer leftchildbuf)
Buffer leftchildbuf, bool markfollowright)
{
XLogRecData *rdata;
gistxlogPageSplit xlrec;
@ -433,6 +434,7 @@ gistXLogSplit(RelFileNode node, BlockNumber blkno, bool page_is_leaf,
xlrec.npage = (uint16) npage;
xlrec.leftchild =
BufferIsValid(leftchildbuf) ? BufferGetBlockNumber(leftchildbuf) : InvalidBlockNumber;
xlrec.markfollowright = markfollowright;
rdata[0].data = (char *) &xlrec;
rdata[0].len = sizeof(gistxlogPageSplit);