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Commitfe28069

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Scan GiST indexes in physical order during VACUUM.
Scanning an index in physical order is faster than walking it in logicalorder, because sequential I/O is faster than random I/O. The idea and codestructure is borrowed from B-tree vacuum code.Patch by Andrey Borodin, with changes by me. Based on early work byKonstantin Kuznetsov, although the patch has been rewritten multiple timessince his original version.Discussion:https://www.postgresql.org/message-id/1B9FAC6F-FA19-4A24-8C1B-F4F574844892%40yandex-team.ru
1 parent35bc0ec commitfe28069

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2 files changed

+287
-195
lines changed

2 files changed

+287
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lines changed

‎src/backend/access/gist/gist.c‎

Lines changed: 5 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -38,8 +38,8 @@ static bool gistinserttuples(GISTInsertState *state, GISTInsertStack *stack,
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boolunlockbuf,boolunlockleftchild);
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staticvoidgistfinishsplit(GISTInsertState*state,GISTInsertStack*stack,
4040
GISTSTATE*giststate,List*splitinfo,boolreleasebuf);
41-
staticvoidgistvacuumpage(Relationrel,Pagepage,Bufferbuffer,
42-
RelationheapRel);
41+
staticvoidgistprunepage(Relationrel,Pagepage,Bufferbuffer,
42+
RelationheapRel);
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4444

4545
#defineROTATEDIST(d) do { \
@@ -261,7 +261,7 @@ gistplacetopage(Relation rel, Size freespace, GISTSTATE *giststate,
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*/
262262
if (is_split&&GistPageIsLeaf(page)&&GistPageHasGarbage(page))
263263
{
264-
gistvacuumpage(rel,page,buffer,heapRel);
264+
gistprunepage(rel,page,buffer,heapRel);
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is_split=gistnospace(page,itup,ntup,oldoffnum,freespace);
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}
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@@ -1544,11 +1544,11 @@ freeGISTstate(GISTSTATE *giststate)
15441544
}
15451545

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/*
1547-
*gistvacuumpage() -- try to remove LP_DEAD items from the given page.
1547+
*gistprunepage() -- try to remove LP_DEAD items from the given page.
15481548
* Function assumes that buffer is exclusively locked.
15491549
*/
15501550
staticvoid
1551-
gistvacuumpage(Relationrel,Pagepage,Bufferbuffer,RelationheapRel)
1551+
gistprunepage(Relationrel,Pagepage,Bufferbuffer,RelationheapRel)
15521552
{
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OffsetNumberdeletable[MaxIndexTuplesPerPage];
15541554
intndeletable=0;

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