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Parameter toast_tuple_target controls TOAST for new rows

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Specifies the point at which we try to move long column values
into TOAST tables.

No effect on existing rows.

Discussion: https://postgr.es/m/CANP8+jKsVmw6CX6YP9z7zqkTzcKV1+Uzr3XjKcZW=2Ya00OyQQ@mail.gmail.com

Author: Simon Riggs <simon@2ndQudrant.com>
Reviewed-by: Andrew Dunstan <andrew.dunstan@2ndQuadrant.com>
This commit is contained in:
Simon Riggs
2017-11-20 09:50:10 +11:00
parent 52f63bd916
commit c2513365a0
7 changed files with 110 additions and 2 deletions
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12
src/backend/access/common/reloptions.c
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@ -23,6 +23,7 @@
#include "access/nbtree.h"
#include "access/reloptions.h"
#include "access/spgist.h"
#include "access/tuptoaster.h"
#include "catalog/pg_type.h"
#include "commands/defrem.h"
#include "commands/tablespace.h"
@ -290,6 +291,15 @@ static relopt_int intRelOpts[] =
},
-1, -1, INT_MAX
},
{
{
"toast_tuple_target",
"Sets the target tuple length at which external columns will be toasted",
RELOPT_KIND_HEAP,
ShareUpdateExclusiveLock
},
TOAST_TUPLE_TARGET, 128, TOAST_TUPLE_TARGET_MAIN
},
{
{
"pages_per_range",
@ -1344,6 +1354,8 @@ default_reloptions(Datum reloptions, bool validate, relopt_kind kind)
offsetof(StdRdOptions, autovacuum) + offsetof(AutoVacOpts, multixact_freeze_table_age)},
{"log_autovacuum_min_duration", RELOPT_TYPE_INT,
offsetof(StdRdOptions, autovacuum) + offsetof(AutoVacOpts, log_min_duration)},
{"toast_tuple_target", RELOPT_TYPE_INT,
offsetof(StdRdOptions, toast_tuple_target)},
{"autovacuum_vacuum_scale_factor", RELOPT_TYPE_REAL,
offsetof(StdRdOptions, autovacuum) + offsetof(AutoVacOpts, vacuum_scale_factor)},
{"autovacuum_analyze_scale_factor", RELOPT_TYPE_REAL,