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Set toast_tuple_target to 128B when able

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We want compressed data to be stored out-of-line whenever possible so
that the headers are colocated and scans on the metadata and segmentbys
are cheap. This commit lowers toast_tuple_target to 128 bytes, so that
more tables will have this occur; using the default size, very often a
non-trivial portion of the data ends up in the main table, and only
very few rows are stored in a page.
This commit is contained in:
Joshua Lockerman 2019-10-04 15:01:20 -04:00 committed by Matvey Arye
parent e9e7c5f38e
commit 48ef701fa9
1 changed files with 24 additions and 0 deletions
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24
tsl/src/compression/create.c
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@ -495,6 +495,26 @@ set_statistics_on_compressed_table(Oid compressed_table_id)
RelationClose(table_rel);
}
#if !PG96 && !PG10
static void
set_toast_tuple_target_on_compressed(Oid compressed_table_id)
{
DefElem def_elem = {
.type = T_DefElem,
.defname = "toast_tuple_target",
.arg = (Node *) makeInteger(128),
.defaction = DEFELEM_SET,
.location = -1,
};
AlterTableCmd cmd = {
.type = T_AlterTableCmd,
.subtype = AT_SetRelOptions,
.def = (Node *) list_make1(&def_elem),
};
AlterTableInternal(compressed_table_id, list_make1(&cmd), true);
}
#endif
static int32
create_compression_table(Oid owner, CompressColInfo *compress_cols)
{
@ -540,6 +560,10 @@ create_compression_table(Oid owner, CompressColInfo *compress_cols)
set_statistics_on_compressed_table(compress_relid);
#if !PG96 && !PG10
set_toast_tuple_target_on_compressed(compress_relid);
#endif
create_compressed_table_indexes(compress_relid, compress_cols);
return compress_hypertable_id;
}