diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/ref/alter_table.sgml | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml index dee026e3a08..5c0735e08a8 100644 --- a/doc/src/sgml/ref/alter_table.sgml +++ b/doc/src/sgml/ref/alter_table.sgml @@ -871,10 +871,11 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM <listitem> <para> This form changes the information which is written to the write-ahead log - to identify rows which are updated or deleted. This option has no effect - except when logical replication is in use. - In all cases, no old values are logged unless at least one of the columns - that would be logged differs between the old and new versions of the row. + to identify rows which are updated or deleted. + In most cases, the old value of each column is only logged if it differs + from the new value; however, if the old value is stored externally, it is + always logged regardless of whether it changed. + This option has no effect except when logical replication is in use. <variablelist> <varlistentry> <term><literal>DEFAULT</literal></term> |