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| author | Heikki Linnakangas <heikki.linnakangas@iki.fi> | 2011-09-08 17:51:23 +0300 |
|---|---|---|
| committer | Heikki Linnakangas <heikki.linnakangas@iki.fi> | 2011-09-08 17:51:23 +0300 |
| commit | 5edb24a8983e4a103e26153853d91141f818227c (patch) | |
| tree | 9e3102de6e2149b0d3678b403c91955e97f3bdc8 /src/backend/access/gist/gistxlog.c | |
| parent | 09b68c70af855a0a69cede14da70968ddd97ba05 (diff) | |
| download | postgresql-5edb24a8983e4a103e26153853d91141f818227c.tar.gz postgresql-5edb24a8983e4a103e26153853d91141f818227c.zip | |
Buffering GiST index build algorithm.
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
Diffstat (limited to 'src/backend/access/gist/gistxlog.c')
| -rw-r--r-- | src/backend/access/gist/gistxlog.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/backend/access/gist/gistxlog.c b/src/backend/access/gist/gistxlog.c index 09b1d489928..8c326462b1d 100644 --- a/src/backend/access/gist/gistxlog.c +++ b/src/backend/access/gist/gistxlog.c @@ -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); |