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Improve bulk-insert performance by keeping the current target buffer pinned

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(but not locked, as that would risk deadlocks).  Also, make it work in a small
ring of buffers to avoid having bulk inserts trash the whole buffer arena.

Robert Haas, after an idea of Simon Riggs'.
This commit is contained in:
Tom Lane
2008-11-06 20:51:15 +00:00
parent cdc197cf31
commit 85e2cedf98
12 changed files with 203 additions and 84 deletions
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6
src/backend/access/heap/rewriteheap.c
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@ -96,7 +96,7 @@
* Portions Copyright (c) 1994-5, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/heap/rewriteheap.c,v 1.15 2008/08/11 11:05:10 heikki Exp $
* $PostgreSQL: pgsql/src/backend/access/heap/rewriteheap.c,v 1.16 2008/11/06 20:51:14 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -575,7 +575,9 @@ raw_heap_insert(RewriteState state, HeapTuple tup)
}
else if (HeapTupleHasExternal(tup) || tup->t_len > TOAST_TUPLE_THRESHOLD)
heaptup = toast_insert_or_update(state->rs_new_rel, tup, NULL,
state->rs_use_wal, false);
HEAP_INSERT_SKIP_FSM |
(state->rs_use_wal ?
0 : HEAP_INSERT_SKIP_WAL));
else
heaptup = tup;