diff options
Diffstat (limited to 'doc/src/sgml/ref/create_tablespace.sgml')
| -rw-r--r-- | doc/src/sgml/ref/create_tablespace.sgml | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/doc/src/sgml/ref/create_tablespace.sgml b/doc/src/sgml/ref/create_tablespace.sgml index c621ec2c6bf..462b8831c27 100644 --- a/doc/src/sgml/ref/create_tablespace.sgml +++ b/doc/src/sgml/ref/create_tablespace.sgml @@ -106,13 +106,16 @@ CREATE TABLESPACE <replaceable class="parameter">tablespace_name</replaceable> <para> A tablespace parameter to be set or reset. Currently, the only available parameters are <varname>seq_page_cost</varname>, - <varname>random_page_cost</varname> and <varname>effective_io_concurrency</varname>. - Setting either value for a particular tablespace will override the + <varname>random_page_cost</varname>, <varname>effective_io_concurrency</varname> + and <varname>maintenance_io_concurrency</varname>. + Setting these values for a particular tablespace will override the planner's usual estimate of the cost of reading pages from tables in - that tablespace, as established by the configuration parameters of the + that tablespace, and the executor's prefetching behavior, as established + by the configuration parameters of the same name (see <xref linkend="guc-seq-page-cost"/>, <xref linkend="guc-random-page-cost"/>, - <xref linkend="guc-effective-io-concurrency"/>). This may be useful if + <xref linkend="guc-effective-io-concurrency"/>, + <xref linkend="guc-maintenance-io-concurrency"/>). This may be useful if one tablespace is located on a disk which is faster or slower than the remainder of the I/O subsystem. </para> |