diff options
| author | Fujii Masao | 2020-10-15 02:04:07 +0000 |
|---|---|---|
| committer | Fujii Masao | 2020-10-15 02:04:07 +0000 |
| commit | 564a410c81b4a9d289c948690a3135d0cd25411b (patch) | |
| tree | a5b27849b4d2c2b17aa00e75e841cccdfe806406 /doc/src/sgml | |
| parent | 4e9821b6fac5042e872d5397f711a67984b165f8 (diff) | |
doc: Mention that toast_tuple_target affects also column marked as Main.
Previously it was documented that toast_tuple_target affected column
marked as only External or Extended. But this description is not correct
and toast_tuple_target affects also column marked as Main.
Back-patch to v11 where toast_tuple_target reloption was introduced.
Author: Shinya Okano
Reviewed-by: Tatsuhito Kasahara, Fujii Masao
Discussion: https://postgr.es/m/93f46e311a67422e89e770d236059817@oss.nttdata.com
Diffstat (limited to 'doc/src/sgml')
| -rw-r--r-- | doc/src/sgml/ref/create_table.sgml | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/doc/src/sgml/ref/create_table.sgml b/doc/src/sgml/ref/create_table.sgml index 28f844071b0..fd6777ae019 100644 --- a/doc/src/sgml/ref/create_table.sgml +++ b/doc/src/sgml/ref/create_table.sgml @@ -1359,10 +1359,11 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM <listitem> <para> The toast_tuple_target specifies the minimum tuple length required before - we try to move long column values into TOAST tables, and is also the - target length we try to reduce the length below once toasting begins. - This only affects columns marked as either External or Extended - and applies only to new tuples; there is no effect on existing rows. + we try to compress and/or move long column values into TOAST tables, and + is also the target length we try to reduce the length below once toasting + begins. This affects columns marked as External (for move), + Main (for compression), or Extended (for both) and applies only to new + tuples. There is no effect on existing rows. By default this parameter is set to allow at least 4 tuples per block, which with the default block size will be 2040 bytes. Valid values are between 128 bytes and the (block size - header), by default 8160 bytes. |