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Tweak TOAST code so that columns marked with MAIN storage strategy are

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not forced out-of-line unless that is necessary to make the row fit on a
page.  Previously, they were forced out-of-line if needed to get the row
down to the default target size (1/4th page).

Kevin Grittner
This commit is contained in:
Tom Lane
2009-07-22 01:21:22 +00:00
parent a5375bf903
commit ca7c8168de
3 changed files with 33 additions and 18 deletions
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8
src/backend/access/heap/tuptoaster.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/heap/tuptoaster.c,v 1.93 2009/06/11 14:48:54 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/heap/tuptoaster.c,v 1.94 2009/07/22 01:21:22 tgl Exp $
*
*
* INTERFACE ROUTINES
@ -796,8 +796,12 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup,
}
/*
* Finally we store attributes of type 'm' external, if possible.
* Finally we store attributes of type 'm' externally. At this point
* we increase the target tuple size, so that 'm' attributes aren't
* stored externally unless really necessary.
*/
maxDataLen = TOAST_TUPLE_TARGET_MAIN - hoff;
while (heap_compute_data_size(tupleDesc,
toast_values, toast_isnull) > maxDataLen &&
rel->rd_rel->reltoastrelid != InvalidOid)