Give more details about what happens if split-domain setting is changed.

Signed-off-by: Miod Vallat <miod.vallat@powerdns.com>

diff --git a/docs/backends/lmdb.rst b/docs/backends/lmdb.rst
index 811ad1bd316a602e4ed961a592347e1ffa51c673..1a019000361baac5dfc67b15d7a09942171c267e 100644 (file)
--- a/docs/backends/lmdb.rst
+++ b/docs/backends/lmdb.rst
@@ -183,6 +183,12 @@ Split the domains table in two, with the last notification timestamp and
 last freshness check timestamp in a separate table.
 This lowers the I/O bandwidth requirements on setups with many zones.
 
+Except for the first time this feature gets enabled, after changing the value
+of this option, the next time the authoritative server starts, it will operate
+on out-of-date data and may send unnecessary notifications, as well as
+perform unnecessary freshness checks. This however allows this feature to work
+without requiring a database schema upgrade.
+
 ``lmdb-lightning-stream``
 ^^^^^^^^^^^^^^^^^^^^^^^^^