diff options
Diffstat (limited to 'doc/src/sgml/ref')
| -rw-r--r-- | doc/src/sgml/ref/alter_table.sgml | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml index 541e093a519..8867da6c693 100644 --- a/doc/src/sgml/ref/alter_table.sgml +++ b/doc/src/sgml/ref/alter_table.sgml @@ -210,6 +210,8 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM When this form is used, the column's statistics are removed, so running <link linkend="sql-analyze"><command>ANALYZE</command></link> on the table afterwards is recommended. + For a virtual generated column, <command>ANALYZE</command> + is not necessary because such columns never have statistics. </para> </listitem> </varlistentry> @@ -271,6 +273,15 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM in a stored generated column is rewritten and all the future changes will apply the new generation expression. </para> + + <para> + When this form is used on a stored generated column, its statistics + are removed, so running + <link linkend="sql-analyze"><command>ANALYZE</command></link> + on the table afterwards is recommended. + For a virtual generated column, <command>ANALYZE</command> + is not necessary because such columns never have statistics. + </para> </listitem> </varlistentry> |